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

Gang Bai; Jingpu Zhang; Hui Shen; Yifeng Yang; Bing He; Jun Zhou

doi:10.1117/12.2520751

26 April 2019 Investigation on the influence of pointing deviation on beam quality in dual-grating spectral beam combination

Gang Bai, Jingpu Zhang, Hui Shen, Yifeng Yang, Bing He, Jun Zhou

Author Affiliations +

Proceedings Volume 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV; 110330T (2019) https://doi.org/10.1117/12.2520751
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

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.

Conference Presentation

Citation Download Citation

Gang Bai, Jingpu Zhang, Hui Shen, Yifeng Yang, Bing He, and Jun Zhou "Investigation on the influence of pointing deviation on beam quality in dual-grating spectral beam combination", Proc. SPIE 11033, High-Power, High-Energy, and High-Intensity Laser Technology IV, 110330T (26 April 2019); https://doi.org/10.1117/12.2520751

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