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Proceedings Paper

Coherent beam combination of seven high power fiber amplifiers with an all-optical feedback loop
Author(s): Houkang Liu; Bing He; Jun Zhou; Chi Liu; Liyun Hao; Shoujun Dai; Yunfeng Qi; Xiaolong Chen
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Paper Abstract

We demonstrated a passive phase locking of a seven-element 352 W all-fiber polarization-maintaining amplifiers array using an all-optical feedback loop. Every single channel has four-stage amplifiers and is seeded by a broadband master oscillator for stimulated Brillouin scattering free. The seven laser beams are tiled side by side into a hexagonal laser array with a high space duty ratio of 65% in the near field. When system is in closed-loop, a visibility more than 90% of coherent pattern in the far field is obtained. By using the all-optical feedback loop and more pump power, higher power scaling with high beam quality appears to be achievable in a coherent beam combination system.

Paper Details

Date Published: 29 November 2012
PDF: 6 pages
Proc. SPIE 8551, High-Power Lasers and Applications VI, 85510P (29 November 2012); doi: 10.1117/12.999551
Show Author Affiliations
Houkang Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Bing He, Shanghai Institute of Optics and Fine Mechanics (China)
Jun Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Chi Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Liyun Hao, Shanghai Institute of Optics and Fine Mechanics (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Shoujun Dai, Shanghai Institute of Optics and Fine Mechanics (China)
Graduate Univ. of the Chinese Academy of Sciences (China)
Yunfeng Qi, Shanghai Institute of Optics and Fine Mechanics (China)
Xiaolong Chen, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8551:
High-Power Lasers and Applications VI
Upendra N. Singh; Dianyuan Fan; Jianquan Yao; Robert F. Walter, Editor(s)

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