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stray light optical design software

including SOLIDWORKS® add-in

optical bench with simulated laser paths in Photopia

Stray Light Optical Analysis Software

Stray light in laser applications can pose a significant safety hazard and should be well understood, especially when optical benches are not in enclosures and non-visible wavelengths are being used.

It is also useful to see stray light paths in real applications where back reflections can damage other equipment in manufacturing environments, such as those using high output fiber lasers.

Photopia's direct integration into SOLIDWORKS makes it simple to import components from manufacturer libraries for the most complete analysis.

Photopia laser light source in Solidworks

Source Model

Photopia contains a library of over 1000 light sources, including a range of lasers which you can place in your model. Lasers can be customized to have any emission wavelength, optical power, beam size, shape and divergence properties.

rendering of optical cube in Photopia for SOLIDWORKS optical design software

Optical Components

Since you're working inside of SOLIDWORKS, you can import a wide range of components from manufacturers to help layout your optical bench.

You can then assign optical material properties to mirrors, beam splitters, lenses and other components. Optical material properties can be selected from Photopia’s library or you can create custom materials using our open library format. Any values of directional reflection & transmission, lens extinction coefficients, AR coatings and indices of refraction can be set over any wavelength range. Photopia can also model material scattering with measured or theoretical BSDF data.

simulation in Photopia for Solidworks showing 3D ray paths on an optical bench

View 3D Rays

Follow stray light paths from Fresnel reflections or material scattering effects. Ray filtering allows you to view subsets of rays based on interactions with specific components or materials. You can also view specific ray reaction numbers. All filtered rays can be saved to a 3D sketch so you can use their paths for any additional modeling you require. Evaluate the magnitude of the light anywhere in the system with irradiance places or 3D surface recorders.

view of irradicance surface in Photopia for Solidworks

View Irradiance

You can setup as many irradance surfaces as you wish in your system to allow you to see quantitative results to confirm the level of irradiation anywhere in the system with irradiance planes or 3D surface recorders. Plane results can be viewed directly in SOLIDWORKS or exported to do any post processing you require.

More details about all of the features of Photopia are on our general Photopia page.


The first step to evaluating if Photopia is a good fit for your company is to schedule an online demonstration where one of our expert optical engineers will discuss your projects and give you a walkthrough of the software. After the online demo, we're happy to provide a 1 week trial license so that you can use the software on your own projects or show it to others in your office.

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Trial Version

After the online demo, we're happy to provide a 2 week trial license so that you can use the software on your own projects or show it to others in your office.


We sell direct and through a network of international representative.

In order to provide a quote please contact us and we'll either provide one or put you in contact with the correct representative.

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optical design software for SOLIDWORKS

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Copyright 2020 by LTI Optics, LLC, all rights reserved.

SOLIDWORKS® is a registered trademark of Dassault Systémes SOLIDWORKS Corporation.

LTI Optics provides Photopia, the industries leading optical design software and optical analysis software for designing and analyzing illumination optical systems. Photopia optical design software works alone or is an add-in to SOLIDWORKS, allowing full opto-mechanical integration.

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