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29 October 2018 Design of high-efficiency confocal paraboloid optical coupler for daylighting
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A set of high-efficiency optical coupler design methods that can be used to collect multiple light sources for compression and integrate them into one light source outlet is proposed. It adopts parabolic confocal principle and high reflectivity coating and completes the structural design with the formulation concept. In addition to direct sunlight collection, the optical coupler is also coupled to the exit source of the collection subsystem of a natural light illumination system (NLIS). The concept of NLIS is to collect sunlight and direct it into indoor lighting. Due to the numerous light sources and the nonparallel light exiting from the light collection subsystem, it is inconvenient for space utilization and back-end transmission. Therefore, the actual NLIS structure is considered as a coupler to improve the efficiency of this design. The optical software used in this study was Fred. Finally, coupling 900 light sources still maintains 50.28% coupler efficiency. The results show that this optical coupler can provide perfect use in the application, and also solve the export problem, and finally achieve high coupler efficiency.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2018/$25.00 © 2018 SPIE
Tzu-Chun Huang, Allen Jong-Woei Whang, Po-Yu Tsai, Yi-Yung Chen, Wei-Chieh Tseng, and Hsi-Chi Chen "Design of high-efficiency confocal paraboloid optical coupler for daylighting," Optical Engineering 57(10), 105107 (29 October 2018).
Received: 15 June 2018; Accepted: 2 October 2018; Published: 29 October 2018

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