Invitation to LASER World of PHOTONICS

(June 12, 2017)

Our teams at Wyrowski Photonics and LightTrans are operating at full stretch for the last sprint in the preparation for the LASER World of PHOTONICS, which is taking place in Munich from June 26 till 29, 2017. We are very excited to inform you that this event will mark the unveiling of our momentous...

New on Youtube: "Getting Started" VirtualLab Fusion Tutorials

(April 04, 2017)

The channel is a common platform of the Applied Computational Optics Group of the Institute of Applied Physics (Friedrich-Schiller-University), and the companies Wyrowski Photonics and LightTrans International. Here we will provide you with short videos on the theory and concepts of an exciting new ...

VirtualLab training courses in Jena in September 2017

(March 02, 2017)

LightTrans offers its new VirtualLab training courses: "Introduction to VirtualLab Fusion", September 18-19, 2017 "Analysis and Design of Diffractive and Micro Optical Systems”, September 20-22, 2017 NEW: "Introduction to VirtualLab Programming”, September 25, 2017 Deadli...

Illumination Systems Design

Homogenization and Shaping of LED and Excimer Laser Light

VirtualLab Fusion enables the design and the simulation of illumination systems for shaping, splitting, diffusing and homogenization of both, laser and LED light. The emphasis of the software package is on the usage of lens arrays, diffractive optical elements and cells arrays consisting of gratings, mirrors and prisms. For the designed components, fabrication data can be exported in several formats including STL and GDSII. Fast physical optics simulation and optimization algorithms enable the design of these optical elements. The modeling takes into account diffraction, interference, polarization and degree of coherence.


  • Homogenization and shaping of LED light
    micro lens arrays, diffractive diffusers, cells arrays of gratings, micro prisms and micro mirrors
  • Deterministic scattering
    surface scattering, volume scattering, real surfaces and index modulations
  • Pattern generation
    light marks and logos for laser and LED light

Applications and VirtualLab Fusion Toolboxes of Illumination Systems Design Package

The table shows which toolboxes of VirtualLab Fusion are recommended for each application. Please contact our sales team to discuss your specific requirements.

Further information can be found on the Starter ToolboxGrating Toolbox, Diffractive Optics Toolbox  and Lighting Toolbox pages.

An additional overview of the features and required VirtualLab toolboxes is shown here.

Skyline pattern generated by diffractive diffuser illuminated by red LED

Homogenization Concepts

The homogenization and shaping of light can be done by micro optical elements, as for example

  • Micro lens arrays
  • Diffractive diffusers
  • Computer generated holograms
  • Phase plates
  • Cells arrays
3D surface of mirror cells array for achromatic shaping of white LED light

Optical simulation and design includes:

  • Diffraction
  • Interference
  • Spatial and temporal degree of coherence
  • Aberrations
  • Polarization
  • Intensity
Ray Tracing simulation of illumination system containing a grating cells array


Illumination systems with micro optical elements enable the following benefits:

  • Homogenization and shaping of LED and Excimer laser light.
  • Generation of arbitrary 2D light patterns.
  • Low sensitivity for variation of radiation characteristic of light source.
  • Very compact illumination systems.
Hexagonal lens arrays can be used for the generation of hexagonal homogeneous light patterns

Micro Lens Arrays

Micro lens arrays, also known as fly’s eye condenser, can be used in various optical setups for the homogenization of LED and Excimer laser light. Micro lens arrays have the following optical properties:

  • Shape of light distribution depends on lens aperture and lens surface
  • Typically used for generation of circular, rectangular and hexagonal light distributions
  • Generation of general 2D light patterns possible
  • Shaping of monochromatic and white light
Surface profile of a diffractive diffuser with 4 height levels

Diffractive Diffusers

Diffractive diffuser, also know as phase plates and computer generated holograms, are scattering components with computer optimized surfaces profiles. Diffractive diffusers have the following optical properties:

  • Diffuser generate a lot of overlapping spots (diffraction orders) in a target plane
  • Generation of arbitrary 2D light patterns
  • For monochromatic LED or Excimer laser light only

Cells Arrays

SEM image of a grating cells array designed by LightTrans

Grating, prism and mirror cells arrays consists of small rectangular cells deflecting the light to specific locations in the target plane. Cells arrays have the following optical properties:

  • Light deflection into target plane controlled by tilts and periods of gratings, micro prism or micro mirrors
  • Optical resolution depends on diffraction at cells apertures
  • Generation of arbitrary 2D light patterns
  • For monochromatic and white light