Optimal geometry for off-axis, freeform illumination design

Caleb Gannon; Rongguang Liang

doi:10.1117/1.OE.57.6.065102

Optimal geometry for off-axis, freeform illumination design

Caleb Gannon, Rongguang Liang

Optical Sciences

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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%.

Original language	English (US)
Article number	065102
Journal	Optical Engineering
Volume	57
Issue number	6
DOIs	https://doi.org/10.1117/1.OE.57.6.065102
State	Published - Jun 1 2018

Keywords

freeform
illumination design
nonimaging optics

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Engineering

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10.1117/1.OE.57.6.065102

Cite this

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abstract = "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%.",

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note = "Funding Information: This research was supported by the National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health Award No. UH2EB022623 and the National Science Foundation Graduate Research Fellowship Grant No. DGE-1746060. Publisher Copyright: {\textcopyright} 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).",

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N2 - 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%.

AB - 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%.

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Optimal geometry for off-axis, freeform illumination design

Abstract

Keywords

ASJC Scopus subject areas

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