Abstract
In this example, we illustrate the modeling of interference and vignetting effects at a total internal reflection (TIR) prism, where these effects are appearing especially for the transmitted part of the light. The discussed type of prism usually consist of two parts, which are glued together with a material of a slightly different refractive index. Dependent on the characteristics of the impinging light, vignetting as well as interference effects are appearing, which are introduced by the narrow gap between both prism parts.
Task Description
An optical system, that contains a total internal reflection (TIR) prism, is modeled. Due to the gap of the
prism, which exhibits a slightly different refractive index, interesting effects may appear:
- Multiple reflections occur at the prism gap. Hence an interference pattern can be observed for instance for
transmitted part of the light.
- With larger divergence of the source or larger tilt angle of the prism gap, vignetting effect can be observed in addition.
- Of course, vignetting and interference can appear in combination
Interference Pattern Investigation with Multiple Reflections
Vignetting Effect with Larger NA of the Beam
Peek into VirtualLab Fusion
Workflow in VirtualLab Fusion
Set up input field
• Construct real components using surfaces
• Define position and orientation of components
• Set channels properly for non-sequential tracing
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