Optimizing triangle mesh lenses for non-uniform illumination with an extended source.

Area of Science:

• Optical Engineering
• Illumination Optics
• Freeform Optics

Background:

• Precise irradiance distribution control is challenging for freeform lenses, particularly for non-uniform targets.
• Current methods often simplify realistic light sources and assume smooth surfaces, limiting design performance.

Purpose of the Study:

• To develop an efficient proxy for Monte Carlo (MC) ray tracing under extended sources for freeform lens design.
• To improve irradiance control for non-uniform light fields using triangle mesh (TM) freeform surfaces.

Main Methods:

• Developed an efficient proxy for MC ray tracing applicable to extended sources.
• Utilized the linear property of triangle mesh (TM) freeform surfaces.
• Compared designs generated with the new method against those from LightTools.

Main Results:

• The new method demonstrated finer irradiance control compared to LightTools designs.
• Experimental fabrication and evaluation confirmed the lens performed as expected.
• The approach effectively handles realistic, extended light sources.

Conclusions:

• The developed proxy offers improved irradiance control for freeform lens design.
• This method enhances the capability to design lenses for complex, non-uniform irradiance fields.
• The findings are validated through experimental results.