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Analysis of Imaging Systems: Wavefront Error and Effect of Apertures

[September 25, 2018]



Imaging systems can be found in various optical applications and they may appear in different configurations. Such systems can be easily setup in VirtualLab Fusion and their performance can be analyzed by using e.g. the wavefront error detector. Especially, the apertures in system is known to have an influence on the imaging quality. VirtualLab can handle the aperture effects properly and take them into ...

[September 25, 2018]



Imaging systems can be found in various optical applications and they may appear in different configurations. Such systems can be easily setup in VirtualLab Fusion and their performance can be analyzed by using e.g. the wavefront error detector. Especially, the apertures in system is known to have an influence on the imaging quality. VirtualLab can handle the aperture effects properly and take them into consideration for the PSF/MTF calculation. As an example, such effects are demonstrated with a human eye model.

Wavefront Error Detector
Wavefront error is defined as the difference between the reference wavefront phase, which is a constant phase or spherical phase, and the detected wavefront phase of one optical system. This use case shows how to handle a wavefront error detector in VirtualLab Fusion.

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Advanced PSF and MTF Calculation of Imaging System
An imaging system consisting of a collimation objective and human eye is modeled, and by changing the illumination conditions, the cases with fully and partially illuminated apertures are investigated.

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Modelling of Graded-Index Media

[September 18, 2018]

 


In optics, several effects like air turbulence or thermal effects in lasers may cause modulations in the refractive index which lead to so-called graded-index (GRIN) media.

This type of media can be useful in certain applications, e.g. flat lenses, reducing aberrations and fibers. The modeling of light propagation through GRIN media is therefore important for practical optical simulations and design. In ...

[September 18, 2018]

 


In optics, several effects like air turbulence or thermal effects in lasers may cause modulations in the refractive index which lead to so-called graded-index (GRIN) media.

This type of media can be useful in certain applications, e.g. flat lenses, reducing aberrations and fibers. The modeling of light propagation through GRIN media is therefore important for practical optical simulations and design. In VirtualLab Fusion an efficient modeling technology has been implemented which is suitable in the cases of e.g. GRIN lenses and GRIN fiber modeling.

To know more about VirtualLab Fusion technologies, please have a look here.

Construction and Modeling of a Graded-Index Lens

VirtualLab allows for the specification of a graded-index lens in a very user-friendly way. In addition, such index-modulated lenses can be analyzed by ray tracing as well as field tracing.

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Modeling of Graded-Index (GRIN) Multimode Fiber

A fast approach for light propagation through a GRIN medium, which includes the polarization crosstalk effect, is implemented and its validity and advantages are shown in comparison to a rigorous solver.

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Import of Zemax Optical Systems and Export for CAD

[September 13, 2018]

 

VirtualLab Fusion offers a user-friendly interface with Zemax, with which the user can import complete optical systems from Zemax, including the full 3D position information and the definition of the glass materials.

This enables an efficient and flexible workflow for optical designers who have access to both software packages - one optical system, constructed once, and analyzed with both Zemax and VirtualLab. On ...

[September 13, 2018]

 

VirtualLab Fusion offers a user-friendly interface with Zemax, with which the user can import complete optical systems from Zemax, including the full 3D position information and the definition of the glass materials.

This enables an efficient and flexible workflow for optical designers who have access to both software packages - one optical system, constructed once, and analyzed with both Zemax and VirtualLab. On another note, optical systems and components in VirtualLab can be exported into various computer-aided design (CAD) formats, such as IGES and STL, which makes it convenient for eventual further fabrication processes.

Import Optical Systems from Zemax

VirtualLab Fusion allows the user to import optical systems with full 3D position information and glasses from Zemax files. The import enables a user friendly interface between the two software packages.

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Export Systems and Components into STL & IGES Format

VirtualLab supports the export of optical components specified in the system into various CAD formats. This includes for example the export of lenses, prisms, mirror systems and other components into STL and in IGES format.

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Panel-Type Source and Its Use in Imaging System Analysis

[September 07, 2018]

 

(Find here the full HTML-Newsletter: https://www.lighttrans.com/index.php?id=1298)

Modern display devices (LCD) are widely used in different optical systems, e.g. image projection systems.

The panel-type source in VirtualLab can be used to model the light generated by such display devices conveniently. In order to configure the source a specific number of pixels and pixel pitch can be set. With the help of the ...

[September 07, 2018]

 

(Find here the full HTML-Newsletter: https://www.lighttrans.com/index.php?id=1298)

Modern display devices (LCD) are widely used in different optical systems, e.g. image projection systems.

The panel-type source in VirtualLab can be used to model the light generated by such display devices conveniently. In order to configure the source a specific number of pixels and pixel pitch can be set. With the help of the panel-type source, the performance of the projection lenses can be analyzed, by e.g. observing the spot grid distortion in the image plane, or by checking the angular/direction behavior of the system.

Modeling of an Image Projection System Based on Panel-Type Display

An image projection system is set up using the panel-type source. The performance of the system is evaluated by observing the spot grid in the spatial and angular domain.

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How to Set Up a Panel-Type Source

With the panel-type source in VirtualLab it is possible to model a pixelated display, and further provides an adjustable number of pixels and pixel pitch.

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Scanning Source and Evaluation of F-Theta Scanning Lens

[August 31, 2018]



(Find here the full HTML-Newsletter: https://www.lighttrans.com/index.php?id=1286 )

High-quality scanning systems are of importance for many optical applications, e.g. in laser beam welding, drilling and cutting. Such systems are typically constructed with F-Theta lenses. An F-Theta lens is supposed to focus the beam onto the focal plane with a lateral displacement proportional to the scan angles.

With the help ...

[August 31, 2018]



(Find here the full HTML-Newsletter: https://www.lighttrans.com/index.php?id=1286 )

High-quality scanning systems are of importance for many optical applications, e.g. in laser beam welding, drilling and cutting. Such systems are typically constructed with F-Theta lenses. An F-Theta lens is supposed to focus the beam onto the focal plane with a lateral displacement proportional to the scan angles.

With the help of the scanning source in VirtualLab, the performance of an F-Theta lens can be analyzed by e.g. measuring the lateral shift and the size of the focal spot for different values of the scan angles.

Performance Evaluation of an F-Theta Scanning Lens

With the scanning source in VirtualLab, we analyze the performance of an F-Theta lens, by measuring the spot size and the deviation of focal spot position for different scan angles.

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How to Set Up a Scanning Source

The scanning source in VirtualLab defines a multi-mode source that radiates into several pre-defined directions, which is of help for e.g. the modeling and evaluation of a laser scanning system.

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Release: VirtualLab Fusion 7.4.0.49

[August 29, 2018]

 

We are pleased to announce the release of VirtualLab Fusion (Build 7.4.0.49)!
The update service must include the 3rd quarter of 2018 to be able to use this update.

VirtualLab Fusion Build 7.4.0.49

You can download the update via the menu item Update Information in VirtualLab directly or through the following link:

Download

Find in addition the updated release notes of VirtualLab Fusion.

VirtualLab Fusion (32bit) ...

[August 29, 2018]

 

We are pleased to announce the release of VirtualLab Fusion (Build 7.4.0.49)!
The update service must include the 3rd quarter of 2018 to be able to use this update.

VirtualLab Fusion Build 7.4.0.49

You can download the update via the menu item Update Information in VirtualLab directly or through the following link:

Download

Find in addition the updated release notes of VirtualLab Fusion.

VirtualLab Fusion (32bit) Build 7.4.0.49

For a 32bit operating system please use the following link:

Download (32bit)

Modeling of Microlens Arrays and Diffraction at Apertures

[July 06, 2018]

 

Microlens arrays can be found in different applications, such as imaging, wavefront sensing, and so on.

With the physical-optics simulation technique in VirtualLab, the working principle of the microlens array, e.g. in the case of wavefront sensing, can be clearly demonstrated, and the performance of such systems can be evaluated efficiently. It is also worth mentioning that the diffraction effect from the edge of ...

[July 06, 2018]

 

Microlens arrays can be found in different applications, such as imaging, wavefront sensing, and so on.

With the physical-optics simulation technique in VirtualLab, the working principle of the microlens array, e.g. in the case of wavefront sensing, can be clearly demonstrated, and the performance of such systems can be evaluated efficiently. It is also worth mentioning that the diffraction effect from the edge of the individual microlenses can be taken into consideration in the simulation.

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Modeling of Microlens Arrays with Different Lens Shapes

The imaging properties of a microlens array with different lens shapes are investigated. Change of the focal spots with respect to aberration of input field is demonstrated.

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Advanced PSF & MTF Calculation for System with Rectangular Aperture

By placing a rotated rectangular aperture behind input fields with different sizes, the PSF and MTF in the focal plane are investigated.

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Evaluation of Fiber Coupling Lenses and Their Design

[June 29, 2018]

 

How to ensure a high-efficient coupling of light into optical fibers is an important question in all fiber-related applications.

In VirtualLab, the focal field behind the coupling lens can be easily calculated with the fast physical optics simulation engine, and by calculating the overlap integral, the fiber coupling efficiency can be evaluated. Additionally, with the parametric optimization, the lens parameter can ...

[June 29, 2018]

 

How to ensure a high-efficient coupling of light into optical fibers is an important question in all fiber-related applications.

In VirtualLab, the focal field behind the coupling lens can be easily calculated with the fast physical optics simulation engine, and by calculating the overlap integral, the fiber coupling efficiency can be evaluated. Additionally, with the parametric optimization, the lens parameter can be optimized for customized situations.

Parametric Optimization of Fiber Coupling Lens

With the parametric optimization in VirtualLab, the design of a fiber coupling lens with conical surfaces for efficient coupling into a single-mode fiber is presented.

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Comparison of Different Lenses for Fiber Coupling

For the task of coupling light into a single-mode fiber, two commercially available lenses are selected, and their performance evaluated using the overlap integral.

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Thermal Lens and Stress-Induced Birefringence

[June 21, 2018]

 

It is vital in design to be able to include in your simulation not only those properties or components that play an intentional, wanted role in the system, but also, and with particular care, those effects which have the potential to interfere with its intended purpose, in order to quantify and, if possible, avoid them.

Below we show two examples of VirtualLab’s potential in this area: all thanks to its fast and ...

[June 21, 2018]

 

It is vital in design to be able to include in your simulation not only those properties or components that play an intentional, wanted role in the system, but also, and with particular care, those effects which have the potential to interfere with its intended purpose, in order to quantify and, if possible, avoid them.

Below we show two examples of VirtualLab’s potential in this area: all thanks to its fast and accurate approach, and an interface that allows you both to import measured data (from, e.g., ANSYS) or to include the effects via readily available or customized mathematical models.

Gaussian Beam Focused by a Thermal Lens

The variation of the focal length due to thermal lens effect and the changes of focal spot diameter are demonstrated with respect to the input laser power.

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Stress-Induced Birefringence in Laser Crystals


The stress-induced birefringence in a YAG crystal is investigated, by examining the change of output field with respect to the strength of stresses.
   
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Construction and Modelling of Graded-Index Media

[June 11, 2018]

 

Graded-index, or GRIN, media are employed in optics to construct, among other components, lenses and multimode fibers. In VirtualLab you can easily choose to include GRIN media as part of your optical system, as it includes a fast and accurate modeling technique accompanied by a user-friendly interface that makes setting up the GRIN component a really easy task.

Find out more through our examples below!

Construction ...

[June 11, 2018]

 

Graded-index, or GRIN, media are employed in optics to construct, among other components, lenses and multimode fibers. In VirtualLab you can easily choose to include GRIN media as part of your optical system, as it includes a fast and accurate modeling technique accompanied by a user-friendly interface that makes setting up the GRIN component a really easy task.

Find out more through our examples below!

Construction and Modelling of Graded-Index (GRIN) Lens

VirtualLab allows the specification of a graded-index lens in a very user-friendly way. In addition, such index modulated lenses can be analyzed by ray tracing as well as field tracing.

Learn more

Modelling of Graded-Index (GRIN) Multimode Fiber
 
A fast approach for light propagation through GRIN medium, which includes the polarization crosstalk effect, is implemented, and its validity and advantages are shown in comparison with rigorous solver.

Learn more

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