High power high brightness laser source for material processing through incoherent beam combination

Jie Xu; Shanghong Zhao; Shengbao Zhan; Rui Hou; Yongjun Li; Lei Shi; Shaoqiang Fang

doi:10.1117/12.782998

14 November 2007 High power high brightness laser source for material processing through incoherent beam combination

Jie Xu, Shanghong Zhao, Shengbao Zhan, Rui Hou, Yongjun Li, Lei Shi, Shaoqiang Fang

Proceedings Volume 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 67221D (2007) https://doi.org/10.1117/12.782998
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

With the continuous increase of output power of double cladding fiber lasers, more effort is put into the researches of the technique of fiber laser beam combination, especially for incoherent laser beam combination because it is easier and with better system stability. Once high power output laser beam is achieved, there would be broad applications in industry, especially for manufacturing and material processing. The combination system's coupling efficiency plays an important role in determining the output power. Through theoretical analysis and numerical simulations, it has been proved that lower lateral off-set and higher grating period would be favorable, also an optimum spot radius exists which corresponds to a maximum value of coupling efficiency. Although lower focal length is helpful in improving the coupling efficiency, there is a contradiction that it makes a narrower fiber array width, which would limits the number of fiber lasers that could be utilized. Thus a moderate value of 20cm is chosen. Based on such optimized parameters, the beam quality M² is around 2, also a method of two parallel gratings is introduced, which ensures the M² factor to be around 1. Such combined fiber laser would be of great potential applications in manufacturing and material processing.

Citation Download Citation

Jie Xu, Shanghong Zhao, Shengbao Zhan, Rui Hou, Yongjun Li, Lei Shi, and Shaoqiang Fang "High power high brightness laser source for material processing through incoherent beam combination", Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 67221D (14 November 2007); https://doi.org/10.1117/12.782998

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