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Investigation on the influence of pointing deviation on beam quality in dual-grating spectral beam combination
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Paper Abstract

Aimed to maintain excellent beam quality, the influence of pointing deviation on the beam quality is theoretically studied in the dual-grating spectral beam combination (SBC). The incident light field of the fiber laser array with the pointing deviation is built by the transformation of coordinates, and the variation rule of the combined beam quality with random perturbations is discussed by the principle of beam diffraction and the statistical analysis. As a result, the degradation of beam quality for the pointing deviation is respectively 0.31(±0.13) and 3.06(±1.27) for the standard deviation of 0.1 mrad and 0.5 mrad, spreading as a Normal distribution. It can be concluded that the pointing deviation of laser array will destroy the condition of the SBC of the common aperture output, resulting in the continuous growth of the M2 factor. These analyses provide a valid basis for setting up the experimental system of dual-grating SBC.

Paper Details

Date Published: 26 April 2019
PDF: 6 pages
Proc. SPIE 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV, 110330T (26 April 2019); doi: 10.1117/12.2520751
Show Author Affiliations
Gang Bai, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Jingpu Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Hui Shen, Shanghai Institute of Optics and Fine Mechanics (China)
Yifeng Yang, Shanghai Institute of Optics and Fine Mechanics (China)
Bing He, Shanghai Institute of Optics and Fine Mechanics (China)
Nanjing Institute of Advanced Laser Technology (China)
Jun Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Nanjing Zhongke Shenguang Technology Co., Ltd. (China)


Published in SPIE Proceedings Vol. 11033:
High-Power, High-Energy, and High-Intensity Laser Technology IV
Joachim Hein; Thomas J. Butcher, Editor(s)

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