# Welcome to Our Download Area

We provide you with an ever increasing selection of documents, which should help you to learn more about the potential and the usage of VirtualLab. We have new documents, especially all Use Cases, which have been developed for VirtualLab Fusion. Other documents refer to VirtualLab 5 or even before. Such older documents carry still a lot of useful information and all examples are ready to use with VirtualLab Fusion. Of course these older documents will be updated step by step.

You can search for keywords you are interested in using the Search command. Alternatively you can directly select a category from the list below. Four categories are of special concern to learn how to work with and benefit from VirtualLab:

**Use Cases**give you modular insight to individual features of VirtualLab Fusion. Some use cases also include sample files. Please switch to www.wyrowski-photonics.com for the download of Use Cases.**Application Scenarios**typically provide you with a Readme and VirtualLab sample files, which allow you to test and try a simulation or design yourselves. Some of the scenarios also come with an additional demo movie in which the use of the sample files is illustrated.**Tutorials**come with movies or presentations in which basic techniques to work with VirtualLab are illustrated.**Modules and Snippets**category offers various C# files with a associated ReadMe. Modules are C# files which solve special tasks which are not implemented as menu driven operations or Light Path Elements. You can run these modules within VirtualLab. Snippets are short pieces of C# code. They specify the functionality of the various programmable items (e. g. programmable functions and programmable interfaces) VirtualLab offers.

Other categories provide you with manuals, articles and technical notes.

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**Recently Added**

In this example, the realization of a Czerny-Turner monochromator setup is discussed. For this purpose, parabolic mirrors and a blazed grating are utilized. The efficiencies of the occurring diffraction orders are calculated rigorously by applying the Fourier Modal Method (FMM). The Parameter Coupling feature is used to enable spectrometric investigations. Furthermore, the spectral resolution of the setup is determined. After characterizing the assembly, it is used to resolve the characteristic wavelength doublet of sodium.

This example treats the simulation of a Mach-Zehnder interferometer using VirtualLab. Thus, beam splitting and combining in VirtualLab are shown in detail. The characteritic interference fringes are calculated by using GFT+. In addition the influence of alignment errors sich as shifts and tilts of elements are presented exemplarily.

In this application example the simulation of a Michelson interferometer using partially temporal coherent white light is discussed. For this purpose a xenon lamp exhibiting a black body spectrum at 6200K temperature is utilized as light source. The impact of the partially coherent light and the interference pattern is shown in detail. Furthermore, a specimen (1 Euro coin) is investigated by topology scanning interferometry.

Topic of this application example is the investigation of mirror aberrations in a laser scanning system based on a single micromirror setup (e.g. MEMS). The discussed aberrations are introduced as Zernike polynomials with different coefficients for different shapes, for example coma (731) and trefoil (933). The influence of these aberrations and their combinations on the beam's profile is shown on the target screen. Furthermore, this strategy enables the simulation of static and dynamic mirror aberrations during the scanning procedure.

In this example, a laser scanning system consisting of a dual axis galvanometer scanner and an aspherical lens as scanning optics is analyzed. The performance is evaluated by analyzing the field curvature and the distortion by ray tracing at the detector. In addition the beam profile and size is determined most accurately by field tracing.

In this example, a laser scanning system consisting of a dual axis galvanometer scanner and an F-Theta objective as scanning optics is analyzed. A significant performance improvement regarding field curvature and distortion is demonstrated compared to the usage of the aspherical lens in LSC.0001. In addition it is shown how the parameter coupling tool of VirtualLab can be used to compensate the nonlinear relation between mirror tilt angles and the resulting incident angle Theta. Furthermore the field of view of the scanning system is calculated.

Topic of this application example is the realization of a reflective, high-performance, dispersion-free, off-axis optical system, in order to collimate and shape a strong astigmatic Gaussian beam of a laser diode. For this purpose, mirrors exhibiting different shapes are utilized, such as parabolic and cylindrical. After the collimation, the beam quality (M² value) is analysed and an approach for optimization is discussed. Further, the influence of the mirror alignment is investigated, per performing a Monte Carlo tolerancing of the mirror orientations.

In this application example the focal beam size of a laser system with aspherical focusing optics is further reduced by introducing an axicon pair. As a result a Bessel beam-like profile is generated, which has smaller focal beam size than the competitive Gaussian beam.

In this application example a lens doublet is to be designed to focus the beam of a laser diode. This is done by VirtualLab’s parametric optimization tools. Hereby the improvement of a ray tracing design based on field tracing is demonstrated.

In this example the collimated light of a diode laser is focused by an aspherical lens and an analysis of the focal region is demonstrated.

In this example VirtualLab’s ray tracing and field tracing simulation engines are applied to investigate the collimation of a beam from a diode laser.

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**Categories**

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**Use Cases**

*Use Cases provide short examples how VirtualLab works.*

The use case gives a basic description of the general structure of the user interface of VirtualLab. The usage of documents will be shown as well as permanent and document-specific ribbons. Also the additional support windows (like property browser) will be illustrated.

The property browser can be used to access additional information for the active document. The use case explain the general structure of the property browser. The property browser will be discussed on the example for 2D data arrays.

This use case explains the basic concept of the Light Path Diagram (LPD) consisting of two separate windows for the setup of optical systems.

This use case explains the basic concept of how optical elements are positioned and oriented within an optical system.

The use case explains how light sources are configured to simulate different radiation in a plane. In general VirtualLab differs between basic and partial coherent sources.

This use case explains the basic catalog concept. It explains how the catalogs can be accessed in general. An overview of all available catalogs is given.

This use case gives an overview of the Parameter Run document.

This use case introduces Calculators which can evaluate and visualize several basic equations and thus help to interpret more complex simulations.

This use case describes the basics about the global options dialog of VirtualLab.

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**Application Scenarios**

Topic of this application example is the investigation of mirror aberrations in a laser scanning system based on a single micromirror setup (e.g. MEMS). The discussed aberrations are introduced as Zernike polynomials with different coefficients for different shapes, for example coma (731) and trefoil (933). The influence of these aberrations and their combinations on the beam's profile is shown on the target screen. Furthermore, this strategy enables the simulation of static and dynamic mirror aberrations during the scanning procedure.

Topic of this application example is the realization of a reflective, high-performance, dispersion-free, off-axis optical system, in order to collimate and shape a strong astigmatic Gaussian beam of a laser diode. For this purpose, mirrors exhibiting different shapes are utilized, such as parabolic and cylindrical. After the collimation, the beam quality (M² value) is analysed and an approach for optimization is discussed. Further, the influence of the mirror alignment is investigated, per performing a Monte Carlo tolerancing of the mirror orientations.

In this application example the focal beam size of a laser system with aspherical focusing optics is further reduced by introducing an axicon pair. As a result a Bessel beam-like profile is generated, which has smaller focal beam size than the competitive Gaussian beam.

In this example, the influence of lens aberrations in an SLM-based beam shaping setup is discussed. For this purpose the ideal Fourier lens of SLM.0001 and SLM.0002 is replaced by real lenses, which exhibit very different optical performances (such as sperical and aspherical lenses). It is shown, that for beam shaping applications a high good optical propertys are inevitable, in order to receive an appropriate beam quality.

Topic of this application example is the investigation of the influence of the non-functional gaps between the pixels of an SLM array. Therefore, the SLM-Module component is used in order to introduce gaps with different widths to the beam shaping design of example SLM.0001. Afterwards, the resulting light pattern is calculated for various area fill factors (according to the gap width). Furthermore, an approach is discussed to reduce the computational effort for the simulation of large area fill factors.

In this application example a reflective spatial light modulator (SLM) should be used as beam shaping element. For this purpose a phase distribution is designed and optimized for a 2f-setup such that a Gaussian input beam is shaped into a rectangular speckle-free Top Hat light pattern.

The configuration steps considering a certain incident angle as well as the data export are discussed as well.

This tutorial demonstrates how to do a CAD export (IGES format) of a VirtualLab system or of a part of it. Furthermore, the import into the CAD software Inventor 2012 is shown.

In this example, a laser scanning system consisting of a dual axis galvanometer scanner and an F-Theta objective as scanning optics is analyzed. A significant performance improvement regarding field curvature and distortion is demonstrated compared to the usage of the aspherical lens in LSC.0001. In addition it is shown how the parameter coupling tool of VirtualLab can be used to compensate the nonlinear relation between mirror tilt angles and the resulting incident angle Theta. Furthermore the field of view of the scanning system is calculated.

In this example, a laser scanning system consisting of a dual axis galvanometer scanner and an aspherical lens as scanning optics is analyzed. The performance is evaluated by analyzing the field curvature and the distortion by ray tracing at the detector. In addition the beam profile and size is determined most accurately by field tracing.

In this example, the realization of a Czerny-Turner monochromator setup is discussed. For this purpose, parabolic mirrors and a blazed grating are utilized. The efficiencies of the occurring diffraction orders are calculated rigorously by applying the Fourier Modal Method (FMM). The Parameter Coupling feature is used to enable spectrometric investigations. Furthermore, the spectral resolution of the setup is determined. After characterizing the assembly, it is used to resolve the characteristic wavelength doublet of sodium.

In this application example the simulation of a Michelson interferometer using partially temporal coherent white light is discussed. For this purpose a xenon lamp exhibiting a black body spectrum at 6200K temperature is utilized as light source. The impact of the partially coherent light and the interference pattern is shown in detail. Furthermore, a specimen (1 Euro coin) is investigated by topology scanning interferometry.

This example treats the simulation of a Mach-Zehnder interferometer using VirtualLab. Thus, beam splitting and combining in VirtualLab are shown in detail. The characteritic interference fringes are calculated by using GFT+. In addition the influence of alignment errors sich as shifts and tilts of elements are presented exemplarily.

In this application example a lens doublet is to be designed to focus the beam of a laser diode. This is done by VirtualLab’s parametric optimization tools. Hereby the improvement of a ray tracing design based on field tracing is demonstrated.

In this example the collimated light of a diode laser is focused by an aspherical lens and an analysis of the focal region is demonstrated.

In this example VirtualLab’s ray tracing and field tracing simulation engines are applied to investigate the collimation of a beam from a diode laser.

This tutorial explains the modeling of holographic generated volume gratings in VirtualLab. In the first part the setup of such gratings is described, whereas in the second part the analysis of wavelength, angle and polarization dependency are investigated in detail. For this Simulation the rigorous Fourier Modal Method is applied.

This scenario demonstrates the evaluation of an ultrashot pulse (USP) that propagates through a high-NA focusing system.

This example demonstrates a typical beam shaping task.

Possible desired requirements, the design, optimization and analysis of a phase-only transmission function of a diffractive optical element (DOE) as beam shaper for the generation of a speckle free top hat are shown.

This application scenario demonstrates the design and analysis of a high NA DOE beam splitter creating a distortion-free grid pattern.

This scenario shows the rigorous simulation of etalons, consisting of two plane-parallel surfaces. Both interfaces can be coated by thin-film coatings. The fully-vectorial simulation includes diffraction and interference effects due to multiple-reflection.

Diffractive lenses or Fresnel lenses can be used to focus sun light on a solar cell. This application scenario shows the modeling of a diffractive lens, the simulation of the point spread function (PSF) and the calculation of the focal intensity for sun light.

This scenarios shows the correction of astigmatism of a Gaussian beam generated by a “edge-emitting” diode laser using a spherical collimation lens and a cylindrical lens.

This sample demonstrates the optimization of diffractive diffuser mirror for the generation of arbitrary light patterns in far field. The optimization of the mirror surface profile is done by the Iterative Fourier Transform Algorithm (IFTA).

This sample demonstrates the parametric optimization of a diffractive beam splitting element. The rigorous Fourier Modal Method is used for a precise modeling of diffraction and interference effects at micro structures in the range of the wavelength of light.

This scenario demonstrates the simulation of light propagation through a wedge plate with low reflection at both surfaces. The simulation will take into account multiple reflections.

VirtualLab enables the simulation of multiple light transmission of a cw laser through an external cavity.

This scenario demonstrates how the radiation characteristics of a real multimode laser source, e.g. a diode laser or an excimer laser, can be implemented in VirtualLab.

This application scenario will demonstrate the modeling and analysis of a Michelson interferometer.

This application scenario demonstrates the design analysis of a Mirror Cells Array (MCA) element for the generation of an arbitrary light pattern.

This application scenario will demonstrate the design and analysis of an index modulated diffuser layer generating a Top Hat.

This scenario demonstrates the use of the Parametric Optimization implemented in VirtualLab, in order to optimize the diffraction efficiency of e.g. a sinusoidal grating structure. The aim is to almost suppress the transmission of the zeroth diffraction order for perpendicular incidence.

This scenario demonstrates the import of intensity and phase data of a single mode laser beam from ASCII and bitmap files.

Demonstration of a classic field tracing simulation of an optical system using an axicon for the generation of a donut ring light distribution.

This application scenario demonstrates the setup of a simple laser system containing a dichroic mirror.

This application scenario demonstrates the optimization of a diffractive beam shaping mirror with arbitrary phase modulation by the Iterative Fourier Transformation Algorithm.

Demonstration of the dependency of the interference contrast on the temporal coherence length on the example of the light diffraction at a double slit

Demonstration of the dependency of the interference contrast on the spatial coherence length on the example of the light diffraction at a double slit

This scenario demonstrates the simulation of an ideal Gires-Tournois Interferometer (GTI) which is used for the compensation of dispersion for fs-pulses.

In the examples, the GTI is used to produce the desired positive or negative group delay dispersion by varying its design parameters. It is shown how the Parameter Run can be used to optimize the design parameters of the GTI.

This scenario demonstrates the implementation of ideal pulse shapers in VirtualLab with different examples. First the temporal pulse shaping with an ideal linear frequency filtering function will be demonstrated without considering spatio-temporal couplings. Then a Fourier-Synthesis Pulse Shaping technique will be considered. In this example, spatio-temporal couplings will be taken into account.

This scenario demonstrates the simulation of an ideal grating stretcher and compressor for laser pulses.

This application scenario demonstrates the modeling and analysis of an idealized micro structured mirror by a boundary response function. The modeling is demonstrated by the example of a micro structured laser beam shaping mirror.

Demonstration of system modeling and simulation for the imaging of a linear grating analyzed with the rigorous Fourier Modal Method (FMM). For the illumination a focused paraxial laser beam is used.

This application scenario demonstrates how an elliptical laser beam can be collimated by an objective lens of 3 single lenses.

This example demonstrates the parametric optimization of a cylindrical aspherical element for the reshaping of a Gaussian laser beam into a Top Hat line.

This application scenario shows the modeling of a simple imaging system containing a spherical lens and a microlens array.

This application scenario demonstrates the simulation of a laser beam in the focal region of a spherical lens. The laser beam is propagated on a screen tilted by 80 degrees.

This application scenario demonstrates how to simulate a digital micromirror device (DMD) with VirtualLab.

This application scenario shows the wave-optical simulation of a reflective Schmidt telescope with VirtualLab. The incident white light is tilted by around 9° field bias with respect to the first mirror, and hence the objective is off-axis.

This application scenario shows the transversal mode analysis of a laser resonator including an active medium in VirtualLab™. Nonlinear gain saturation as well as inhomogeneously distributed pump light is taken into account. The output power as well as the transversal mode distribution is calculated.

Several laser systems require a splitting and combination of laser beams. This is typically done by beam splitting/combining cubes and plates. Some applications, as for example the coherent coupling of diode laser array by an external resonator mirror, require the combination of tens or hundreds of laser beams. In this cases laser beams can be combined using diffractive optical elements.

This application scenario demonstrates the design of a laser system combining 5x5 Gaussian beams into a single beam by two diffractive optical elements.

This scenario illustrates the analysis of a ring resonator. A new concept of the round trip operator is used to calculate the dominant resonator eigenmode.

In this application scenario a parametric optimization of a real achromatic beam expander is shown in VirtualLab™.

A spherical lens is used to image the two dimensional object. The image will be simulated and the dependency on the lens aperture diameter will be investigated.

An image filter can be constructed by two 2f-setups and an aperture. The simulation of this space frequency filter system can be done using ideal or real optical components. Both is demonstrated in this application scenario.

This scenario demonstrates the rigorous analysis and optimization of anti-reflective moth-eye structures, which exhibit structure sizes in the sub-wavelength domain. Further, the influence of structure parameters such as diameter and height is investigated and the sensitivity to changes of wavelength and incidence angle are illustrated.

The example shows the analysis of a focusing lens system and the calculation of PSF and MTF in VirtualLab.

This scenario shows the definition of a diffractive lens by an analytical surface equation. Furthermore the PSF and the MTF of the resulting binary diffractive lens are calculated including higher diffraction orders and stray light.

This application scenario illustrates the analysis of an unstable resonator and the computation of its outcoupling mode.

The simulation of a bifocal lens with a hybrid surface is demonstrated. The combined interface of VirtualLab™ is used to define the lens surface by a superposition of a spherical and a diffractive surface.

This application scenario shows the import of aberrations from an ASCII file and the simulation of the effect of lens aberrations with low and middle frequencies by the sampled interface.

Demonstrates the design of a diffractive beam shaper for the reshaping of Gaussian laser beam into a donut mode.

This application scenario demonstrates the design and analysis of a micro structured mirror for the generation of a diffuse angular light distribution.

This application scenario demonstrates the design and analysis of a high NA DOE creating a distortion-free grid pattern.

This application scenario demonstrates how to simulate a spatial light modulator (SLM) with the help of VirtualLab.

This scenario illustrates the design and analysis of a grating cells array (GCA) element for the reshaping of LED light into a cross pattern.

This example demonstrates the setup of a beam shaper system by the refractive beam shaper session editor. The optical performance of the resulting system can be improved by the parametric optimization of VirtualLab™.

This application scenario demonstrates the parametric optimization of two different polarizers for the UV spectral range, consisting of a wire grid sub-wavelength grating structure. The two setups will address different purposes, such as 193nm operation wavelength and an appropriate efficiency uniformity for a desired spectral range.

This application scenario demonstrates the parametric optimization of an aspherical focusing lens for coupling of a collimated laser beam in a single mode fiber.

The goal is to optimize the radius, conical constant of the conical interfaces and distance between lens and fiber such that the fiber coupling efficiency is maximized.

Simulation and optimization take into account diffraction, interference and aberration effects if necessary and allow wave-optical quality measurements.

This scenario demonstrates rigorous analyses of the summed efficiencies of all reflected orders for a linear grating with and without high reflective coating.

The influence of the light‘s polarization is also regarded.

This application scenario shows how a lens system can be optimized using the parametric optimization of VirtualLab™. The target is to optimize the focusing properties of the lens system for a given laser beam and a prescribed back focal length. The radii of the 4 conical surfaces are used as free parameters.

Simulation and optimization take into account diffraction, interference and aberration effects if necessary and allow wave-optical quality measurements.

This scenario demonstrates the rigorous analysis and a two step optimization of pillar type anti-reflective gratings with sub-wavelength structure size. In addition, the influence of pillar diameter and height is investigated.

This application scenario shows the simulation of a light source whose spectral composition is equal to that of the sun.

This application scenario shows how resonance effects influence the transmission efficiencies of a glass plate and how a coating alters this effect.

This scenario shows how an LCD source consisting of a matrix of RGB pixels can be generated in VirtualLab™. The same approach can be used for any multi-color source based on pixels.

In this scenario we demonstrate the import of laser resonator systems from LASCAD into VirtualLab™. We show how these setups can be modified and analyzed in VirtualLab™. Further, the eigenmodes and the outcoupling mode are analyzed.

This application scenario demonstrates the simulation of alignment and etching depth tolerances of a beam shaping system with a diffractive optical element.

The simulation of a bifocal lens with a hybrid surface is demonstrated. The programmable interface of VirtualLab™ is used for the modeling of a customized microstructured optical lens surface.

Example for the homogenization of a LED by two lens arrays with rotationally symmetric lenses.

In this scenario we simulate and visualize the buildup of laser oscillation based on the Fox-Li numerical approach.

Example for the simulation of the light propagation through a non-paraxial aspherical lens and the simulation of vectorial effects in the focal region.

Surfaces in VirtualLab are usually smooth. In contrast, real surfaces are always rough to a certain degree.

This application scenario demonstrates the simulation of a Gauss beam that passes a glass plate with a rough surface according to measured height profile data. In 1m distance the the scattered light is analyzed.

In this application scenario we show how a resonator with a micro-structured mirror can be designed such that the eigenmode has a pre-defined amplitude. In particular we design an eigenmode with a top-hat shape.

The simulation of a high NA refractive micro lens array will be demonstrated. The microlens array is generated with the help of the periodization option.

The simulation of a sinusoidal grating with a rough random surface will be demonstrated. The simulation is done using the programmable interface in a stack on the General Grating 2D Component of VirtualLab.

Demonstrates the simulation of a spherical lens used for coupling of light into a single mode fiber and shows the optimization of the fiber position by the parameter run.

This scenario shows the simulation of a diffractive beam splitting element by the double interface component of VirtualLab™. The surface profile is defined by discrete height samples. For the simulation the sampled interface will be used.

In this scenario we show how parameter studies can be realized in VirtualLab™ in order to investigate the dependence of eigenmodes of resonators from system parameters. In particular we consider the variation of aperture sizes and the resulting variation of beam parameters as radius and M².

This scenario demonstrates how eigenmodes and eigenvalues of laser resonators can be computed. Resonators with idealized components (mirrors, lenses) and real components with index modulated media are considered.

It is demonstrated how a GRIN lens with a pitch of 0.25 can be simulated with VirtualLab™.

This scenario demonstrates the rigorous computation of electromagnetic field distributions inside periodical structures. For this purpose, two very different setups are investigated: a slit in a rectangular metallic grating and a dielectric grating with triangular shape (isosceles).

This example demonstrated VirtualLab‘s capability of modeling and analyzing volume Bragg holograms. The wavelength sensitivity of this volume grating is investigated as well as for which thickness the intended maximum reflection is reached.

Hybrid laser modes are locally polarized. Its generation is illustrated. Especially radial and azimuthal polarization is considered. The polarization view is used to investigate local polarization.

A coated slanted grating is generated with the Programmable Medium of VirtualLab™. The reflectance of this grating is then analyzed in the Parameter Run for different orientations of the grating.

Shows the design of a diffractive optical element for diffuse deflection of light along the x-axis.

This application scenario demonstrates the design and optimization of a diffractive optical element (DOE) as light diffuser for the geneation of a rectangular top hat pattern.

Example for the design and optimization of a diffractive optical element for the generation of a general 2D diffuse intensity distribution.

The application scenario shows the design of a diffractive optical element (DOE) for splitting of one laser beam into a regular array of 5x5 beams.

The application scenario shows the design of a diffractive beam splitter for splitting of one laser beam into a regular array of 5x5 beams.

This application scenario demonstrates the design and optimization of a binary diffractive optical element (DOE) as beam splitting element for the generation of a 2D spot array representing a light pattern defined by a bitmap file.

This application scenario shows how to perform a rigorous analysis of a diffractive 1:6 beam splitter optimized by the Diffractive Optics Toolbox.

This application scenario shows the simulation of a homogenization system for an excimer laser beam using a diffractive diffuser. The diffuser is optimized to generate a circular top hat.

This application scenario shows the simulation of the light propagation through a non-paraxial spherical lens and the simulation of the quality of a laser beam in the focal plane.

This application scenario demonstrates the import of lens data from Zemax and the simulation of light propagation through lens system including the calculation of laser beam parameters in focal plane.

This application scenario shows the simulation of a non-paraxial beam shaping system. The diffractive beam shaping element is expressed by a quantized 4-level phase transmission.

This application scenario demonstrates the import of a user defined phase plate from ASCII or bitmap data and shows the simulation of the diffraction at this plate.

Illustration of transforming linearly into circularly or any kind of elliptically polarized light. The use of Jones matrices and the Polarization View is described.

Illustration of transforming linearly into circularly or any kind of elliptically polarized light. The use of Jones matrices and the Polarization View is described.

A 2f-setup is used to investigate far-field diffraction at a rectangular and circular apertures, which is modeled by an ideal aperture transmission function.

A 2f-setup is used to investigate far-field diffraction at a rectangular and circular apertures, which is modeled by an ideal aperture transmission function.

Near field diffraction of a Gaussian beam at an aperture, which is modeled by an ideal aperture transmission function, is investigated. To this end the automatic propagation operator is used. Continued in RSI.002c.

Near field diffraction of a Gaussian beam at an aperture, which is modeled by an ideal aperture transmission function, is investigated. To this end the automatic propagation operator is used. Continued in RSI.002c.

Near field diffraction of a Gaussian beam at an aperture, which is modeled by an ideal aperture transmission function, is investigated. To this end the Parameter Run feature of VirtualLab is used to illustrate the change of the field dependent of the distance.

Near field diffraction of a Gaussian beam at an aperture, which is modeled by an ideal aperture transmission function, is investigated. To this end the Parameter Run feature of VirtualLab is used to illustrate the change of the field dependent of the distance.

The resolution limit of an imaging system with an ideal lens is investigated. To this end we use an ideal grating object and consider its image for different periods. Abbe's resolution limit is illustrated. The effect of the wavelength on the resolution is also demonstrated.

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**First Steps Tutorials**

This tutorial gives an introduction to the Laser Resonator Toolbox. It shows how the session editor is used to set up a resonator. Further the computation of eigenmodes is discussed. Finally it is shown how the parameter run can be used to investigate the dependence of the eigenmode on parameters as the sizes of apertures.

This tutorial gives an introduction on how to use programmable light sources and programmable transmissions in a Light Path Diagram.

This tutorial gives a short introduction on how to setup and simulate a simple Light Path Diagram.

This tutorial gives a basic example on how to build up and modify a Light Path Diagram.

This tutorial gives a short introduction on how to use the Parameter Run

together with the Light Path Diagram in VirtualLab™. The Parameter Run

is used to vary parameters of an optical system automatically.

This tutorial gives a short introduction on how to setup the propagation in a Light Path Diagram.

This tutorial gives a short introduction on how to use detectors in a Light Path Diagram.

This tutorial gives a short introduction on how to setup materials and media

in a Light Path Diagram that is used in VirtualLab™ to describe optical

systems.

This tutorial gives a short introduction on how to use light sources in a Light Path Diagram.

This tutorial gives a short introduction on how to use light sources in a Light Path Diagram.

This tutorial gives a short introduction on how to setup materials and media

in a Light Path Diagram that is used in VirtualLab™ to describe optical

systems.

This tutorial gives a short introduction on how to use detectors in a Light Path Diagram.

This tutorial gives a short introduction on how to setup the propagation in a Light Path Diagram.

This tutorial gives a short introduction on how to use the Parameter Run

together with the Light Path Diagram in VirtualLab™. The Parameter Run

is used to vary parameters of an optical system automatically.

This tutorial gives a basic example on how to build up and modify a Light Path Diagram.

This tutorial gives a short introduction on how to setup and simulate a simple Light Path Diagram.

This tutorial gives an introduction on how to use programmable light sources and programmable transmissions in a Light Path Diagram.

This tutorial gives an introduction to the Laser Resonator Toolbox. It shows how the session editor is used to set up a resonator. Further the computation of eigenmodes is discussed. Finally it is shown how the parameter run can be used to investigate the dependence of the eigenmode on parameters as the sizes of apertures.

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**Tutorials**

This tutorial will explain the design and analysis of an index modulated diffuser layer generating a Top Hat.

This tutorial demonstrates how to get suitable sampling settings (sampling factors) for a Double Interface Component (DIC).

This tutorial gives an introduction into positioning of programmable components as well as into the handling of planes and coordinate systems inside a programmable component.

This tutorial gives an overview of the parameters of the programmable detector. The input data types are discussed as well as the possible output data types.

This tutorial explains the usage of the programmable component on a simple example. The component propagation snippet is discussed. The correct usage of coordinate systems is demonstrated more in detail.

This tutorial introduces the concept used in the light path diagram for the setup of optical components within optical systems. The definition of component position, tilts and alignment tolerances are demonstrated.

This tutorial shows the various ways how optical systems, components, and interfaces in VirtualLab can be exported to interfaces and solids in the STL format.

This tutorial gives an introduction to the programming in VirtualLab. An overview on programmable objects and programming techniques is given.

This tutorial shows some of the manipulations which can be done on Numerical Data Arrays.

This tutorial gives an introduction how MATLAB code can be used within VirtualLab. This functionality is demonstrated by the programmable component that performs a simple rotation of the input field by the usage of MATLAB.

This tutorial gives an introduction to the import of data arrays.

This tutorial gives an introduction to the concepts and the usage of the Lighting Toolbox. Analysis and Design of Grating Cells Arrays are demonstrated.

This tutorial gives an introduction to the usage of the parametric optimization in VirtualLab™. As an example, we consider the search of the focus of a spherical lens.

This tutorial shows how databased interfaces are handled within VirtualLab. Two different kinds of interfaces are discussed, the sampled interface, which can be used for equidistant data, and the transition point list interface, which allows the user the description of an interface with 1D-non-equidistant data. The databased interfaces can be used for the investigation of measured height data.

This tutorial demonstrates how a Essential Macleod coating can be applied to the Single Interface component of VirtualLab™.

This tutorial shows how surface profiles of optical interfaces can be manipulated in VirtualLab™. Definition areas (apertures), scaling, pixelation, quantization and periodization are being discussed.

This tutorial explains the usage of the structure design in VirtualLab™. Also the handling for import and export of fabrication data is shown.

This tutorial gives an introduction to the usage of the Raytracing Analyzer. This analyzer visualizes rays within components and the principles of the Geometrical Optics operator.

VirtualLab™ enables modeling the propagation of ultrashort pulses through optical systems. This tutorial introduces you to basic techniques.

This tutorial explains the usage of 3D gratings in VirtualLab™.

This tutorial gives an introduction to the Laser Resonator Toolbox. It shows how the session editor is used to set up a resonator. Further the computation of eigenmodes is discussed. Finally it is shown how the parameter run can be used to investigate the dependence of the eigenmode on parameters as the sizes of apertures.

This tutorial gives an introduction on how to use programmable light sources and programmable transmissions in a Light Path Diagram.

VirtualLab provides a well guided way to create an optical system for analyzing desired gratings.

This tutorial demonstrates the basic investigation of the near field and the diffraction efficiencies of the orders created by a linear (peridic in one direction) sinusoidal grating.

This is shown for two gratings: On the one hand with a period distinctly above and on the other hand with a period in the range of the wavelength.

This tutorial demonstrates the design of a diffractive beam shaper for the illumination of a rectangular area with high homogeneity.

This tutorial gives a short introduction on how to setup and simulate a simple Light Path Diagram.

This tutorial gives a basic example on how to build up and modify a Light Path Diagram.

This tutorial gives a short introduction on how to use the Parameter Run

together with the Light Path Diagram in VirtualLab™. The Parameter Run

is used to vary parameters of an optical system automatically.

This tutorial gives a short introduction on how to setup the propagation in a Light Path Diagram.

This tutorial gives a short introduction on how to use detectors in a Light Path Diagram.

This tutorial gives a short introduction on how to setup materials and media

in a Light Path Diagram that is used in VirtualLab™ to describe optical

systems.

This tutorial gives a short introduction on how to use light sources in a Light Path Diagram.

This tutorial gives a short introduction on how to use light sources in a Light Path Diagram.

in a Light Path Diagram that is used in VirtualLab™ to describe optical

systems.

This tutorial gives a short introduction on how to use detectors in a Light Path Diagram.

This tutorial gives a short introduction on how to setup the propagation in a Light Path Diagram.

together with the Light Path Diagram in VirtualLab™. The Parameter Run

is used to vary parameters of an optical system automatically.

This tutorial gives a basic example on how to build up and modify a Light Path Diagram.

This tutorial gives a short introduction on how to setup and simulate a simple Light Path Diagram.

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**Modules and Snippets**

The snippet demonstrates the modeling of a 3D sinusoidal volume grating by the programmable medium.

This snippet for the programmable detector demonstrates the export of the amplitude of all harmonic fields of an harmonic fields set into ASCII format.

This programmable detector provides an alternative method for the estimation of spot sizes. Similar to a rigid half width half maximum (HWHM) evaluation the so-called flexible HWxM detector enables the evaluation of the light distribution regarding a user defined threshold level "x".

This snippet calculates and returns the 2D Modulation Transfer Function (MTF) of an imaging system.

This module converts each subset of a one- or two-dimensional data array into a distinct ASCII file.

This snippets demonstrates the modeling of a temporally and spatially partial coherent source which is in infinite distance from an optical system. The source is modeled by a set of plane wave modes. The demonstrated sample corresponds to a model of the sun.

This snippet for a programmable function models the spectral response of a color filter. The user can specify a filter transmission depending on the wavelength by a sample customized transmission function.

The module can be used to apply rounded edges to a data array that represents the height profile of a sampled interface. The generated data array can be used within the optical setup for analyzing the optical effect of the fabrication tolerance.

This snippet for a Programmable Detector enables the automated saving of a light distribution (harmonic fields set) to the hard disk.

This module converts a harmonic field given in spectral domain to a Numerical Data Array in angular coordinates.

This snippet can be used within the mode selection of a partial coherent light source. The snippet calculates the x-y-position for each lateral mode. The user can specify the size, the number and the distances between the LED areas. Additionally the user may specify the number of modes to simulate each LED.

This snippet can be used within a programmable detector. The snippet evaluates the spectrum of the incident field and calculates the power rectangle which contains 99.9999% of the power of the field. This value is read from the Global Options dialog.

The programmable detector calculates the ratio between the size of the spectrum and the evaluated power rectangle. From this value an oversampling factor of the field is derived.

This snippet measures fiber coupling efficiency of a multi mode fiber. The coupling efficiency is the ratio between the optical power coupled into the fiber and the total power of the light distribution.

This snippet for a Programmable Function defines a multiple slit.

This snippet for a Programmable Detector extracts a profile line from the incoming field.

This snippet models in a programmable detector the effect of pixel arrays, pixel matrices, photo diode arrays, CCD sensors or CMOS sensors.

This snippet for a programmable detector calculates intensity-based merit functions of Diffractive Optics for harmonic fields sets.

Simple programming example illustrating the access on field values via source code and how to program a Programmable Detector.

This module can be used to evaluate ultrashort pulses along the z-axis. This evaluation is done a) separately for each wavelength of the pulse and b) for different times.

This snippet for a programmable detector calculates the degree of coherence between two arbitrary lateral positions.

This snippet applies to an arbitrary input field the Jones Matrix of an azimuthal birefringent element.

This snippet applies to an arbitrary input field the Jones Matrix of a plano-concave lens made out of a birefringent material.

This snippet defines a x-y-modulated medium with a hexagonal periodic structure, using two different materials.

This module can be used to calculate the incoherent sum of all members of a user defined harmonic fields set. The user can specify within this module which vectorial component should be used for the evaluation.

This snippet enables the user to simulate a so-called "Digital Micromirror Device" (DMD) which is a type of "Spatial Light Modulator" (SLM).

This snippet imported into a programmable function describes a rotatable rectangular or elliptical aperture.

This module replicates a one- or two-dimensional, equidistantly sampled data array periodically. Therefor the user has to specify an integer replication factor for both x- and y-direction.

This snippet defines a lens array on a hexagonal grid. Each lens is a conical interface.

This module extracts the information of a grating cells array (GCA) and converts it to a transmission function document representing the gratings‘ structure via phase values in 2pi modulo display.

The module is applied to a 2D harmonic field. The harmonic field is covered by an array of cells with a user-defined size. The power of the harmonic field is computed for all cells and the values are shown as data array.

fast fourier transform, execution time, computing time, design, module, IFTA, FFT, MOD.008, Module_008

The programmable mode planar source of VirtualLab allows the definition of customized modes being used in the planar source model. This snippet implements elementary modes resulting in a cos^n-type radiant intensity for the simulation of LEDs and other high NA sources including Lambertian sources with VirtualLab.

This snippet for the parameter run allows to vary two parameters equidistantly at the same time. All combinations of the two parameters are simulated.

This module can be used to export one physical quantity (e.g. amplitude, phase, …) of each member of a selected harmonic fields set to a set of ASCII files. The user can specify the location to export to, as well as the physical quantity he likes to export. The exported ASCII files can be used for further investigation in other mathematical tools like MATLAB.

This snippet defines a surface profile of a truncated pyramid.

This snippet defines a surface profile of a truncated cone.

This snippet can be used to create a rectangular grating interface, which has round edges. This type of interface can be used to investigate some tolerance analyzes of the fabrication process.

The snippet defines a chirped gaussian pulse in time domain. This snippet can be loaded into the Programmable Pulse Spectrum generator which creates a complex spectrum over wavelength. For further investigations this spectrum can be used as spectrum of a light source in your optical system.

This snippet defines a toroidal interface.

This module shows intermediate results of the automatic propagation operator including the estimated numerical effort and estimates for the error of the individual free space operators. The propagation distance can be varied and the diagrams are shown for the automatic, spectrum of plane wave (SPW), Fresnel, far field and geometrical optics operator.

This snippet defines a microlens array on a rectangular grid. Each microlens is a conical interface.

The programmable interface of the optical interface component of VirtualLab enables the deﬁnition of customized freeform interfaces. This snippet allows modeling of anamorphic interfaces with VirtualLab™.

This module measures the profile width of a harmonic field, transmission, or signal field for a certain threshold (relative to maximum intensity). It is a generalized detector for measuring the full width at half maximum (FWHM).

This module generates a diagram with the spectrum of a Harmonic Fields Set at a certain (physical) position.

This snippet defines a cylindrical lens array function for a given rotation angle, period and focal length.

The module supports the user in setting up the parameters for the design algorithm and results in a standard transmission design document that is used to perform the beam shaping.

This snippet defines a double slit function for given width and distance of the slits.

This snippet defines a double pinhole function for given radius and distance of the pinholes.

This snippet defines a cylindrical lens function for a given rotation angle and focal length.

This snippet defines an axicon function for a given angle.

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**Talks**

This webinar will give an overview of the simulation of LED light including diffraction, interference, polarization, partial coherence and aberrations. In addition the webinar will give an introduction into design and simulation of micro optical components and the importance of diffraction, interference and partial coherence for the homogenization and shaping process. Webinar topics include modeling and simulation of LED Light including partial coherence, diffraction, interference, polarization and aberrations, homogenization and shaping of monochromatic and white LED Light, design and simulation of computer generated holograms, phase plates, diffractive diffusers, micro lens arrays, grating cells arrays, prism cells arrays and mirror cells arrays, generation of arbitrary 2D light patterns and the export of fabrication data in GDSII, CIF, ASCII and bitmap file formats.

This webinar will give an overview of the simulation of LED light including diffraction, interference, polarization, partial coherence and aberrations. In addition the webinar will give an introduction into design and simulation of micro optical components and the importance of diffraction, interference and partial coherence for the homogenization and shaping process. Webinar topics include modeling and simulation of LED Light including partial coherence, diffraction, interference, polarization and aberrations, homogenization and shaping of monochromatic and white LED Light, design and simulation of computer generated holograms, phase plates, diffractive diffusers, micro lens arrays, grating cells arrays, prism cells arrays and mirror cells arrays, generation of arbitrary 2D light patterns and the export of fabrication data in GDSII, CIF, ASCII and bitmap file formats.

The webinar will provide you a good overview, how VirtualLab can be used for the control and analysis of ultrashort optical pulses. The following topics will be discussed in detail: ultra-short pulse representation in VirtualLab, pulse propagation through homogeneous dispersive media, fs pulse propagation through macroscopic components like off-axis parabolic mirrors, simultaneous spatial and temporal focusing (SSTF), analysis of ideal pulse stretchers and compressors, compensation of dispersion for fs-pulses by a Gires–Tournois interferometer.

The webinar will provide you a good overview, how VirtualLab can be used for the control and analysis of ultrashort optical pulses. The following topics will be discussed in detail: ultra-short pulse representation in VirtualLab, pulse propagation through homogeneous dispersive media, fs pulse propagation through macroscopic components like off-axis parabolic mirrors, simultaneous spatial and temporal focusing (SSTF), analysis of ideal pulse stretchers and compressors, compensation of dispersion for fs-pulses by a Gires–Tournois interferometer.

The shaping and homogenization of partially coherent light, as for example, of Excimer lasers and of LEDs, by micro structured optical components is of increasing importance in various fields including material processing, medical engineering, automotive and illumination. Especially light diffusing micro structures enable optical illumination systems with a low sensitivity for variations of the illuminating light distribution and for the component alignment. The seminar gives an introduction into VirtualLab™ toolboxes and concepts for shaping and homogenization of coherent and partially coherent light. We will introduce arrays of grating cells, prism cells, mirrors cells as well as diffractive diffusers and micro lens arrays for shaping and homogenization of monochromatic and polychromatic partially coherent light.

In the webinar we demonstrate the transversal mode analysis of stable, unstable and ring resonators using VirtualLab™ 5.8. In particular we demonstrate how inhomogeneous pump light distribution and thermal lensing is affecting the output beam quality and power. Finally the webinar shows the design of a transversal resonator eigenmode with top-hat shape using a micro-structured mirror.

In the webinar we demonstrate the transversal mode analysis of stable, unstable and ring resonators using VirtualLab™ 5.8. In particular we demonstrate how inhomogeneous pump light distribution and thermal lensing is affecting the output beam quality and power. Finally the webinar shows the design of a transversal resonator eigenmode with top-hat shape using a micro-structured mirror.

The release of LightTrans Virtual Lab™ 5.8 is a big step forward to even more realistic simulations and improved optical system setups. VirtualLab™ 5.8 provides a great new flexibility regarding positioning, tilting and tolerancing of all optical elements. The rigorous Fourier Modal Method’s grating analysis can be used within optical systems with general illumination waves.

STL (a CAD) format, improved pulse analysis, new features for programmers, tools for better overview/control of VirtualLab are also introduced.

You may watch the video on Youtube.

The release of LightTrans VirtualLab™ 5.8 is a big step forward to even more realistic simulations and improved optical system setups. VirtualLab™ 5.8 provides a great new flexibility regarding positioning, tilting and tolerancing of all optical elements. The rigorous Fourier Modal Method’s grating analysis can be used within optical systems with general illumination waves.

STL (a CAD) format, improved pulse analysis, new features for programmers, tools for better overview/control of VirtualLab are also introduced.

You may watch the video on Youtube.

We present the latest developments of VirtualLab™ for the simulation of laser systems, ultrashort pulses and laser resonators. We introduce the concept of field tracing which is unique at the market. Field tracing utilizes and provides an electromagnetic description of the light. It is the basis for unified optical modeling which allows the combination of different modeling techniques, including user defined techniques, for the simulation of optical systems. VirtualLab™ enables the simulation of laser systems with a particular strength in micro and diffractive optics. The electromagnetic representation of light allows to simulate single and multi-mode lasers as well as ultrashort pulses. The latter can easily be analyzed in frequency and time domain based on new user friendly tools of VirtualLab™. Recently, several new solutions for the analysis of resonators have been added to VirtualLab™. In the seminar, we present a few of them and show examples for ongoing developments. At the end we invite all participants to discuss the current state and your requirements for the resonator modeling with VirtualLab™.

Diffraction gratings are used in various applications, for example, for the splitting of laser beams, polarization control, to add antireflection properties to surfaces and spectrometry. In the webinar we demonstrate the rigorous simulation of 2D and 3D gratings with the Grating Toolbox of VirtualLab™ 5.5. We give an introduction to the powerful stack concept of VirtualLab™ that allows the specification of general volume gratings as a sequence of customized surfaces and media. In addition the webinar demonstrates that any non-periodic surface of VirtualLab™ can be switched into a periodic mode to model for example lens arrays. Finally we show how VirtualLab™ can be used to optimize a present periodic structure to increase its optical performance.

Diffraction gratings are used in various applications, for example, for the splitting of laser beams, polarization control, to add antireflection properties to surfaces and spectrometry. In the webinar we demonstrate the rigorous simulation of 2D and 3D gratings with the Grating Toolbox of VirtualLab™ 5.5. We give an introduction to the powerful stack concept of VirtualLab™ that allows the specification of general volume gratings as a sequence of customized surfaces and media. In addition the webinar demonstrates that any non-periodic surface of VirtualLab™ can be switched into a periodic mode to model for example lens arrays. Finally we show how VirtualLab™ can be used to optimize a present periodic structure to increase its optical performance.

Dr. Mourad from Brookhaven National Laboratory, NSLS II, invited Prof. Frank Wyrowski, President of LightTrans, to present in a seminar talk at NSLS II the modeling of optical systems by field tracing at October 19, 2012 in New York, USA. The application of field tracing for x-ray system simulation was of concern. In conclusion of the seminar both sides decided to strengthen the investigation of x-ray modeling with field tracing by VirtualLab.

This webinar introduces the latest features of LightTrans VirtualLab™ 5.5: Programmable Components, Detectors and Materials; Integration of MATLAB Code; Analysis of Unstable Laser Resonators

This webinar introduces the latest features of LightTrans VirtualLab™ 5.5: Programmable Components, Detectors and Materials; Integration of MATLAB Code; Analysis of Unstable Laser Resonators

Slides of a talk given at a Cooptics workshop in Jena. Surface and Volume scattering is being discussed, sources for the scattering effects are named. Conclusions are drawn leading to requirements for the optical simulation of those effects. It is shown that field tracing is well suited to solve the simulation tasks. Examples are presented including the simulation of aspheres with fabrication errors and the volume scattering on media with particles. Finally the option of using user defined modeling techniques in VirtualLab is being discussed.

This webinar introduces the latest features if VirtualLab™ 5.3/5.4 . These new features are related to the rigorous analysis of gratings, new options for optical interfaces and their export, new features of import and export of structure and field data and the simulation of a spatial light modulator (SLM), namely a digital micromirror device (DMD).

This webinar introduces the latest features if VirtualLab™ 5.3/5.4 . These new features are related to the rigorous analysis of gratings, new options for optical interfaces and their export, new features of import and export of structure and field data and the simulation of a spatial light modulator (SLM), namely a digital micromirror device (DMD).

Slides of a talk given at the Optonet workshop "Software for Optics". Based on unified optical modeling, harmonic fields are traced through the system instead of ray bundles. Field tracing utilizes and provides an electromagnetic description of the light in an optical system. VirtualLab™ enables the simulation of laser optics, micro optical systems, diffractive optics, interferometers, imaging and illumination systems. The propagation includes diffraction, interference, aberrations and polarization effects. In the talk we give an introduction, discuss different propagation techniques and present several examples.

Slides of a talk given at DGao annual meeting 2012 by Site Zhang. The propagation of harmonic fields between non-parallel planes is a challenging task in optical modeling. Many well-known methods are restricted to parallel planes. However, in various situations a tilt of the field is demanded, for instance in case of folded setups with mirrors and tolerancing with tilted components. We propose a rigorous method to calculate vectorial harmonic fields on tilted planes. The theory applies a non-equidistant sampling in the k-space of the field before rotation in order to obtain an equidistant sampling of the rotated field. That drastically simplifies the interpolation challenge of the tilt operation. The method also benefits from an analytical processing of linear phase factors in combination with parabasal field decomposition. That allows a numerically efficient rotation of any type of harmonic fields. We apply this technique to the rigorous propagation of general harmonic fields through plane interfaces. If the field is known on the interface a fast algorithm results from a plane wave decomposition of the field. However in general, the field is not known on the interface. Then a rotation operator must be applied first.

Slides of a talk given at DGao annual meeting 2012 by Daniel Asoubar. We propose a parabasal field decomposition of non-paraxial fields, which enables various operations on such fields which are otherwise not feasible because of too high numerical effort. It is useful to distinguish between two basic cases of non-paraxial fields: 1) The field can be sampled without problems in the space domain but it is very divergent because of small features. A Gaussian beam with large divergence is an example. In this case the propagation of the field typically causes too high numerical effort and is not feasible. 2) The field possesses a smooth but strong phase function, which does not allow its sampling in space domain. Spherical, cylindrical and astigmatic waves with small radius of curvature are examples. In this case all operations which require a field sampling cannot be applied. For both cases a parabasal field decomposition is suggested which overcomes the problems. By separating linear phase factors from the parabasal fields the sampling effort is reduced drastically. This technique is applied to propagate non-paraxial fields.

Slides of a seminar given at OPTATEC 2012, Frankfurt am Main, May 2012. VirtualLab™ is the first field tracer on the market. Based on unified optical modeling, harmonic fields are traced through the system instead of ray bundles. Field tracing utilizes and provides an electromagnetic description of the light in an optical system. VirtualLab™ enables the simulation of laser optics, micro optical systems, diffractive optics, interferometers, imaging and illumination systems. The propagation includes diffraction, interference, aberrations and polarization effects. In the seminar, we give an introduction to VirtualLab™ and to the principles of field tracing. Several applications for the analysis and the design of laser systems including ultrashort pulses are presented. Special attention is paid on how coherence, interference and polarization effects are taken into account.

This webinar introduces the latest features if VirtualLab(TM) 5.1/5.2 . These new features are related to the rigorous analysis of 2D/3D gratings, the 3D view of optical systems and a field tracing as well as ray tracing analysis of optical systems. At the end several new snippets and modules will be introduced.

This webinar introduces the latest features if VirtualLab(TM) 5.1/5.2 . These new features are related to the rigorous analysis of 2D/3D gratings, the 3D view of optical systems and a field tracing as well as ray tracing analysis of optical systems. At the end several new snippets and modules will be introduced.

Slides of a talk given at SPIE Photonics West 2012, San Francisco, January 2012. Beam shaping systems can be used in order to transform the intensity profile of laser beams into a customizable profile. Lenses together with refractive and diffractive beam shaping elements can be used for the transformation of the beam. Typically diffraction and interference are neglected during the optimization of refractive beam shaping elements and the simulation is often based on a geometrical optics approximation. Such an approximation is not feasible in many situations, e.g., if the shaping works at the resolution limit of the system. In the talk we present a parametric optimization algorithm for refractive beam shaping systems taking into account diffraction and interference effects.

Slides of a talk given at SPIE Photonics West 2012, San Francisco, January 2012. Field tracing generalizes the concepts of ray tracing. In particular harmonic fields are traced through the system instead of ray bundles. Hence field tracing utilizes and provides more information about the light in optical systems. The error due to the physical approximation can be minimized and consequently many effects as e.g. diffraction and interference are modeled much more accurate than by ray tracing. In this talk, we introduce a new approach for the analysis of multiple reflections that occur between the optical interfaces of an optical system. We establish a non-sequential formulation of the multiple reflection problem by combining individual propagation steps between two optical interfaces at a time.

VirtualLab™ 5 introduces a variety of new features and improvements. The Lighting Toolbox enables the design and analysis of illumination systems for homogenization and shaping of LED light by micro structured components. In addition VirtualLab™ 5 simplifies the design of refractive beam shaping systems. The webinar will introduce the rigorous parametric optimization of gratings and will discuss it on the sample of the design of a subwavelength polarizer.

VirtualLab™ 5 introduces a variety of new features and improvements. The Lighting Toolbox enables the design and analysis of illumination systems for homogenization and shaping of LED light by micro structured components. In addition VirtualLab™ 5 simplifies the design of refractive beam shaping systems. The webinar will introduce the rigorous parametric optimization of gratings and will discuss it on the sample of the design of a subwavelength polarizer.

In this webinar we are going to inform you about parametric optimization of laser systems with LightTrans VirtualLab™ 4.10. The optimization is based on LightTrans field tracing concept and allows taking into account diffraction, interference, polarization and aberration effects. In addition optimization can be done with respect to typical laser optics merit functions, as for example, laser beam parameters, efficiencies and uniformity error.

In this webinar we are going to inform you about parametric optimization of laser systems with LightTrans VirtualLab™ 4.10. The optimization is based on LightTrans field tracing concept and allows taking into account diffraction, interference, polarization and aberration effects. In addition optimization can be done with respect to typical laser optics merit functions, as for example, laser beam parameters, efficiencies and uniformity error.

Slides of a talk given at a workshop of Bayern Photonics in March 2011.

In this webinar we will inform you about innovations in the field of the rigorous electromagnetic analysis of general 2D and 3D gratings with the Grating Toolbox of VirtualLab™.

In this webinar we will inform you about innovations in the field of the rigorous electromagnetic analysis of general 2D and 3D gratings with the Grating Toolbox of VirtualLab™.

In this talk we present the concept of Unified Optical Modeling that allows to combine different simulation techniques within a single modeling task. In particular we focus on the combination of Finite Element Methods (FEM) with classical propagation techniques including free space and geometrical optics propagation. We show that using locally adapted simulations techniques can speed up calculations considerably or can make them feasible at all. The described methods are especially useful in biological applications that are characterized by different length scales, e.g. if the scattered field of cell structures is to be analyzed in the far field or behind a lens.

Slides of a talk given at the annual DGaO (German Society for Applied Optics) meeting in June 2009.

Slides of a talk given at the annual DGaO (German Society for Applied Optics) meeting in June 2009.

Unified optical modeling includes the analysis of color and coherence effects. The talk briefly discusses the principles of unified optical modeling and ist application for color and cohgernece modeling. VirtualLab, which is based on unified optical modeling, is used to demonstrate the concepts.

Diffractive optical elements are often used in laser beam shaping systems. It is known that they are sensitive to the variation of wavelength. During the last years new design approaches of diffractive optical elements were suggested using the different dispersion characteristics of glasses. This allows the reduction of chromatic effects. Nevertheless the authors show that especially the angular dispersion can’t be removed. The authors extend the known design methods for the optimization of refractive beam shaping elements. Again different glasses must be used to achieve an achromatization within a limited wavelength range. It is shown that this allow also the reduction of angular dispersion. The desig approach is demonstrated for the example of reshaping a Gaussian intensity distribution into a circular Top Hat.

Laser resonators consist in general of a series of single components including mirrors, lenses and homogeneous or index-modulated and active media. The goal of the simulation is to compute the eigenmodes of the resonator by an iterative procedure that requires propagating the light along the resonator in each iteration step. For that purpose several propagation techniques are available, for example, spectrum of plane waves and Fresnel integral, beam propagation methods (BPM) and ABCD Matrices with different approximation properties. It is shown that the simulation of resonators can be optimized with respect to accuracy and efficiency by adapting the propagation method locally to the individual resonator components.

The use of CGHs for the generation of three dimensional signals and its holographic exposure is an already known idea. But in the past the state of PC technique limited the bandwidth product very strongly. Because of the technical development of 64-bit operating systems it becomey possible to make simulations with data fields which are bigger than 4GB. The new 64bit VirtualLab™ Advanced enables the calculation of high resolution signals, in which parallax and shadowing 3D effects are included. The calculated signals have a resolution of 50.000 by 50.000 sampling points and more. The result of the design is a binary CGH with a diffraction efficiency of about 10%. The 3D signal is copied into a photo polymer which results in a volume hologram with high diffraction efficiency.

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**Technical Notes**

This document contains the complete Release Notes of Wyrowski VirtualLab Fusion.

This technical note describes the calculation of the size of a field in the target plane after a rotation operation.

This technical note describes the complete (homogeneous medium) propagation operation between two arbitrarily situated light path elements.

This technical note gives an introduction to the usage of the parametric optimization in VirtualLab™. It describes the algorithmic background, especially how the target function is defined and how constraints are being handled.

This technical note describes the algorithm that is used for the generation of transition points as they are required by the Fourier Modal Method (FMM). The FMM is applied in VirtualLab™ for the rigorous analysis of gratings.

This technical note describes the update procedure that is necessary to update the dongle of VirtualLab™.

This technical note describes how VirtualLab™ can be customized with modules and snippets and describes the used syntax. It includes the most recent version of the VirtualLab™ Programming Reference and of the LightTrans.Programming.dll, matching VirtualLab™ 5.11.

This technical note describes how VirtualLab™ can import light field data and hence, at the same time, how light field data have to be exported by third party software such that VirtualLab™ can import these data.

A virtual optics laboratory simulation needs an appropriate concept for defining positions, e. g. in order to model the setup of an optical bench adequately. The position concept of VirtualLab™ is explained here.

This document describes the interpretation of imported bitmaps as polychromatic light.

This document describes the correct display of light on a monitor.

This document contains the complete Release Notes of LightTrans VirtualLab.

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**Articles**

The propagation of harmonic fields through arbitrary optical

components is the fundamental task in optical modeling. Unified

optical modeling by field tracing uses different techniques for

different components in order to ensure the best compromise between

simulation effort and accuracy. This approach can be extended to

non-harmonic fields. With a set of harmonic fields modeling partial

coherence of stationary sources is enabled. The same approach can be

applied to model the propagation of fully coherent ultrashort pulses

through optical systems, which may include for instance lenses,

gratings and micro-optical components. For that we can rely on field

tracing with its numerous sophisticated propagation techniques for a

single harmonic field. Methods to reduce frequency domain sampling

are presented. They allow a convenient pulse modeling in practice.

Several examples are presented using ultrashort pulse modeling with

VirtualLab™.

Recently the importance of numerical simulations for the design of laser resonators has grown considerably. This applies in particular if the alignment of components within the resonator is crucial for its stability. In such cases a tolerance analysis is required that can be done most effciently using numerical simulation tools.

In this paper, we introduce a computer model for resonators based on components and their combination using absolute or relative positioning. We show that this approach is the basis for tolerancing and sensitivity analysis.

Further we discuss the concepts of ﬁeld tracing and uniﬁed optical modeling that allow the coupling of several propagation methods within one modeling task. For laser resonators this involves in particular free space propagation methods as the Fresnel integral, geometrical optics and split step beam propagation methods.

The primary goal is to provide a fully vectorial simulation as accurate as required and as fast as possible.

This approach covers in particular general eigenmode models and general geometries including micro-structured surfaces that can be used for additional beam control as it is shown in the examples.

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**VirtualLab Manual**

Current version of the VirtualLab Administrator's Manual in PDF format. A PDF Reader (e.g. Acrobat Reader) is needed. (May 2016, matching VirtualLab Fusion User Experience Edition Build 6.2.0)

Current version of the VirtualLab User's Manual in PDF format. A PDF Reader (e.g. Acrobat Reader) is needed. (July 2016, matching VirtualLab Fusion 6.2.1)