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Proceedings Paper

Investigation on the influence of spectral linewidth broadening on beam quality in spectral beam combination
Author(s): Fei Tian; Hong Yan; Li Chen; Yidong Ye; Jianmin Li; Jia Luo; Fei Lu
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Paper Abstract

Spectral beam combination (SBC) is a promising method to combine multiple fiber outputs for further power scaling with the capability of maintaining high beam quality, but the beam quality will be degraded with spectral linewidth broadening, because it could result in additional angular spread in the output beam. In this paper, we described theoretical calculation as well as experimental investigation on the influence of spectral linewidth broadening on beam quality. The results show that in single SBC system the spectral linewidth should be limited to less than a few GHz in order to avoid beam quality degradation, but the linewidth requirement could be decreased to more than hundreds of GHz using a pair of parallel gratings, which reveals a feasible way to increase the stimulated Brillouin scattering (SBS)-free power output of single fiber laser for overall output scaling and high beam quality.

Paper Details

Date Published: 3 February 2015
PDF: 7 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92553N (3 February 2015); doi: 10.1117/12.2065455
Show Author Affiliations
Fei Tian, China Academy of Engineering Physics (China)
Hong Yan, China Academy of Engineering Physics (China)
Li Chen, China Academy of Engineering Physics (China)
Yidong Ye, China Academy of Engineering Physics (China)
Jianmin Li, China Academy of Engineering Physics (China)
Jia Luo, China Academy of Engineering Physics (China)
Fei Lu, China Academy of Engineering Physics (China)


Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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