VirutalLab FUSION 7.4


VirutalLab FUSION 7.4

VirtualLab Fusion provides a platform for connecting optical field solvers. This approach enables fast physical optics with ray tracing.

Following the field tracing concept, in VirtualLab Fusion we connect various modeling technologies.
The six basic ideas on how to achieve fast simulations in physical opticse are:


  • Instead of just one, we use an arsenal of rigorous and approximated field solvers.
  • VirtualLab Fusion constitutes a platform for connecting field solvers by a unique operator and channel concept.
  • Field solvers work in different domains. We use the Fast Fourier Transform (FFT) and in-house developed Fourier transform algorithms in order to overcome sampling issues of the FFT.
  • We consequently apply pointwise instead of integral operations wherever possible.
  • Partially coherent and pulsed light fields are represented by a suitable source mode decomposition.
  • Full access to electromagnetic fields enables evaluation of any detector function which might be of concern in optics modeling, including radiometric and photometric data.

All the different technologies are implemented in one single software platform – VirtualLab Fusion – where they work smoothly together.

Cascaded apertures, 4f setups, laser systems
Considering diffraction throughout an optical system, as opposed to working under the assumption that diffraction will not appear until the exit pupil, is vital to model a series of well-known scenarios: 4f setups, cascaded apertures, paraxial Gaussian systems. “In VirtualLab Fusion 2020.1 we implement a collection of innovative Fourier transform algorithms with a unique hybrid data handling to keep computational effort in check, plus a fully automatic, but customizable, decision-making process,” explains Frank Wyrowski, president of LightTrans.
All of which, together, ensure diffraction effects are taken into account throughout the system in a faster and more user-friendly way.

Gratings & stratified media
Agility in the computation of Fourier transforms not only has repercussions in the simulation of diffraction effects: a quick back-and-forth between the space and k domains is a necessity to model systems which combine components with different natural domains, as is the case e.g. for lenses or other curved surfaces (space domain), and gratings (k domain). CTO Site Zhang emphasizes, “The new components in version 2020.1 for gratings, plane interfaces, and stratified media take full advantage of a rigorous k-domain treatment. With the new medium which facilitates the definition of pillars with varying parameters, we now support a user-friendly configuration and simulation of metagratings.” For example, non-intuitive effects, like the angular/spectrum dispersion and polarization dependency, are automatically taken into account.

Diffractive lenses & holographic optical elements (HOEs)
The new components for diffractive lenses and HOEs tackle the local variation of parameters in the structure with the use of the local linear grating approximation (LLGA), with both the rigorous Fourier modal method (FMM) and the thin-element approximation (TEA) available as local algorithms to model the interaction of light with the structure.

Augmented and mixed reality
AR & MR have been common in science fiction for decades. We are now bearing witness to the growth of this technology in real life; however, tackling the challenges which remain yet to be overcome – specifically those related to the optics – demands dedication and ingenuity. To the modeling and design tools dedicated to this topic already previously available, version 2020.1 adds a visualization of the beam footprints superimposed onto the segmented grating regions. LightTrans International has also partnered with Dynardo to offer optiSLang®’s evolutionary algorithm embedded in VirtualLab Fusion’s user interface (sold separately).


LightTrans International UG
LightTrans offers solutions for the entire development cycle of optical components. Our products and services include optical design software, optical engineering, training and consulting. All the products and services of LightTrans are based on the physical optics design software “VirtualLab Fusion” developed and produced by Wyrowski Photonics, which provides ray tracing and fast physical optics methods.



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