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Proceedings Paper

A binary beam-splitter for lidar beam-shaping in laser imaging application
Author(s): Guoxing Zheng; Song Li; Hui Zhou
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Paper Abstract

In three-dimensional laser imaging system, multi-channel laser transmitting and receiving can increase the coverage area and provide better surface information and roughness than traditional single channel. The multi-channel laser beams can be realized by a diffractive beam-splitter, and in this paper the problem of designing a binary beam-splitter that produces 8×8 uniform intensity beams from a Gaussian-profile input beam is considered. To produce spots with even number, each period of the beam-splitter is divided into four phase-inverse parts to compress the even diffractive orders and reserve the odd orders. Simulated annealing algorism is applied in the beam-splitter design and in the numerical simulation, fabrication error tolerance, environmental issues, input field fluctuation and other factors are considered. The simulated results show that the performance of the device is quite insensitive to the amplitude fluctuation of input laser beam, the diffractive efficiency exceeds 77% and the uniformity between spots is about 0.12%, which confirm the efficiency of the design. This device will be fabricated in our lab soon.

Paper Details

Date Published: 12 March 2008
PDF: 7 pages
Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 66241J (12 March 2008); doi: 10.1117/12.791139
Show Author Affiliations
Guoxing Zheng, Wuhan Univ. (China)
Song Li, Wuhan Univ. (China)
Hui Zhou, Wuhan Univ. (China)


Published in SPIE Proceedings Vol. 6624:
International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing

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