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...

Shaping and homogenization of LED light

Array of rectangular grating cells for generating a light pattern in the target plane.

The VirtualLab Lighting Toolbox provides field tracing for the analysis and design of illumination systems. Field tracing enables the usage of new concepts with emphasis on the integration of microstructures and diffractive optics. That gives more flexibility for the design of compact illumination systems for the homogenization and shaping of LED light as well as light of other sources with highly divergent radiation.

The  Lighting Toolbox comes with an innovative light shaping concept which is based on an array of gratings. Each cell of the array deflects the light into predefined directions and results in a light spot in the target plane. The light spots of all array cells together form the desired light pattern.

The analysis and design applies field tracing from the source to the target plane and takes into account refraction, diffraction, and interference effects. The light emitted from the source, e.g. the LED, is modeled including color, spatial and temporal partial coherence, and polarization.

Your Benefit

Simulated 2D light  pattern generated by a grating cells array component.
Simulated 2D light pattern generated by a grating cells array component.
  • Development of compact illumination systems for the homogenization and shaping of LED light.
  • Design of optical elements for the generation of light patterns and light marks.
  • The modeling of LED and other sources includes power spectrum, spatial and temporal coherence and polarization
  • Field tracing to analyze arrays of micro-structured gratings.
  • Rigorous analysis of grating efficiencies (Grating Toolbox required).

Selected Features

LED light is shaped by cells array component and detected in target plane.

Analysis of cells array component. The Lighting Toolbox provides a planar component with a grating cells array on one side of it.  Each cell deflects the light in a predefined direction. This effect can be basically analyzed by ray tracing. However, then both the diffraction at the cell apertures and the partial interference of the spots in the target plane are not taken into account. Since the Lighting Toolbox provides also the field tracing analysis it includes all these effects.

Simulation of light pattern generated by grating cells array.

Electromagnetic analysis of grating cells. The application of grating cells to deflect LED light requires small periods of the gratings in the cells array. That demands an electromagnetic analysis of the diffraction efficiency of the gratings, in order to predict the light distribution in the target plane correctly. Together with the Grating Toolbox the Lighting Toolbox enables such a sophisticated analysis of the grating cells array.

LED source modeling. The Lighting Toolbox comes with an built in electromagnetic LED source model. It includes the bandwidth, the spatial and temporal coherence, as well as the polarization of the LED. To this end a cosine type radiant intensity is assumed. Users possessing measured data of the radiant intensity and the near field of the LED may import the data into the source model.

Ray tracing analysis of cells array component in reflection mode.
Ray tracing analysis of cells array component in reflection mode.

Design algorithm for cells array component. The Lighting Toolbox provides a design algorithm which calculates  the functional parameters of the cells array component for the generation of a  binary intensity distribution. The optical resolution is controlled by the cell diameter and the number of cells. The resulting components are able to generate both, rectangular and circular top hats, lines and binary customized 2D intensity patterns. Alternatively, the user can import a customized data set to specify all fundamental cells array parameters.

Binary etching mask of grating cells array obtained by GDSII export.

Generation of fabrication data. Design and analysis result in data that specify the grating cells array. The Lighting Toolbox supports the export in CSV format and in GDSII-format including the calculation of etching masks.