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23 September 2011 Ultra-slim collimator with an inverse design
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Original construction is proposed to collimate light into a narrow beam. The solution is very compact and provides high efficiency. Two elements are used. Freeform reflector and a plate of PMMA with a special pyramid structure on the first surface. LED source is mounted in a plastic plate and emits light into opposite direction. After reflection from freeform reflector light beam suffers TIR in plastic plate and is collimated with a very high efficiency into desired direction. Thickness of proposed design is about 5 mm. Efficiency and divergence depends on the size of emitting area and diode's package size. For diode with a size of emitting area of 2 mm and a package size of 6 mm last ones were 88% and 7 degree.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emil Aslanov, Nikolay Petrov, Alexey Borodulin, and Georgy Tananaev "Ultra-slim collimator with an inverse design", Proc. SPIE 8170, Illumination Optics II, 81700U (23 September 2011);

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