Optimal geometry for off-axis, freeform illumination design

Caleb Gannon, Rongguang Liang

Research output: Contribution to journalArticle

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 languageEnglish (US)
Article number065102
JournalOptical Engineering
Volume57
Issue number6
DOIs
StatePublished - Jun 1 2018

Keywords

  • freeform
  • illumination design
  • nonimaging optics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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