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Proceedings Paper

Beam-shaping of laser diode stack for uniform illumination by cylindrical micro-lenses
Author(s): Wangpin ShangGuan; Huimin Yan; Yanbing Jiang; Xiuda Zhang; Chao Yang
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Paper Abstract

A novel beam-shaping method which obtains nearly uniform illumination for a high-power Laser Diode (LD) stack is introduced. Based on the properties of the angular distribution during the Gaussian beams propagate, a flat-topped beam profile can be achieved by the superposition of Multi-tilted Gaussian beams. Due to the theory above, the individual lensing techniques are introduced to shape the beams of the LD stack. Cylindrical lenses are used to control the divergence-angle of the output beams. By adjusting the offset of each cylindrical micro-lens, each output beam on the fast axis gains the different tilted emitting-angle. Meanwhile the beams on the slow axis are also shaped by a large cylindrical lens. Thus the beam-shaping optical system is designed to reconfigure the beams of a high power LD stack to form a Multi-tilted Gaussian beam shape for a 10°×10° field-angle illumination. The simulation results from ASAP software show that uniform illumination can be obtained in the far-field district. With the proper uniformity and high efficiency, the beam-shaping optical system we have proposed for high-power LD stacks can be well suitable for laser illuminator in laser active imaging and detecting system.

Paper Details

Date Published: 13 November 2010
PDF: 6 pages
Proc. SPIE 7844, Semiconductor Lasers and Applications IV, 784405 (13 November 2010); doi: 10.1117/12.869960
Show Author Affiliations
Wangpin ShangGuan, Zhejiang Univ. (China)
Huimin Yan, Zhejiang Univ. (China)
Yanbing Jiang, Zhejiang Univ. (China)
Xiuda Zhang, Zhejiang Univ. (China)
Chao Yang, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 7844:
Semiconductor Lasers and Applications IV
Ning-Hua Zhu; Jinmin Li; Farzin Amzajerdian; Hiroyuki Suzuki, Editor(s)

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