7 June 2018 Optimal geometry for off-axis, freeform illumination design
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A thorough investigation into the efficiency and performance of off-axis, freeform illumination systems has been conducted, and a method for arriving at the optimal tilt is established for both reflective and refractive designs. The optimal tilt for refractive designs is determined by minimizing the total light lost due to Fresnel reflections across the lens, while the optimal tilt for reflective designs ensures the source is not obstructing the reflected ray bundle. For uncoated lenses, utilizing the proposed tilt can improve efficiency by more than 150%.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Caleb Gannon, Caleb Gannon, Rongguang Liang, Rongguang Liang, } "Optimal geometry for off-axis, freeform illumination design," Optical Engineering 57(6), 065102 (7 June 2018). https://doi.org/10.1117/1.OE.57.6.065102 . Submission: Received: 25 January 2018; Accepted: 10 April 2018
Received: 25 January 2018; Accepted: 10 April 2018; Published: 7 June 2018


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