Optimal geometry for off-axis, freeform illumination design

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%. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health [UH2EB022623]; National Science Foundation Graduate Research Fellowship [DGE-1746060]This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu