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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 11,
  • Issue 12,
  • pp. 122201-122201
  • (2013)

Innovative coupler design based on a tapered light pipe with lens

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Abstract

Natural light illumination system (NLIS) generates increasing research interest because of the recent trend toward green energy. Various crucial optical components used in a NLIS are analyzed, designed, and fabricated to obtain high efficiency. A large amount of light is loss because of the large viewing angle during light transmission. A tapered light pipe (TLP) is used to collimate light viewing angles. In this letter, we combine a TLP and a traditional lens as a new coupler based on Etendue theory. The original efficiency is only 17.54%, but the efficiency reaches more than 70% when the new coupler is applied.

© 2013 Chinese Optics Letters

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