Beam-shaping of laser diode stack for uniform illumination by cylindrical micro-lenses

Wangpin ShangGuan; Huimin Yan; Yanbing Jiang; Xiuda Zhang; Chao Yang

doi:10.1117/12.869960

12 November 2010 Beam-shaping of laser diode stack for uniform illumination by cylindrical micro-lenses

Wangpin ShangGuan, Huimin Yan, Yanbing Jiang, Xiuda Zhang, Chao Yang

Proceedings Volume 7844, Semiconductor Lasers and Applications IV; 784405 (2010) https://doi.org/10.1117/12.869960
Event: Photonics Asia 2010, 2010, Beijing, China

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.

Citation Download Citation

Wangpin ShangGuan, Huimin Yan, Yanbing Jiang, Xiuda Zhang, and Chao Yang "Beam-shaping of laser diode stack for uniform illumination by cylindrical micro-lenses", Proc. SPIE 7844, Semiconductor Lasers and Applications IV, 784405 (12 November 2010); https://doi.org/10.1117/12.869960

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