Coherent beam combination of seven high power fiber amplifiers with an all-optical feedback loop

Houkang Liu; Bing He; Jun Zhou; Chi Liu; Liyun Hao; Shoujun Dai; Yunfeng Qi; Xiaolong Chen

doi:10.1117/12.999551

29 November 2012 Coherent beam combination of seven high power fiber amplifers with an all-optical feedback loop

Houkang Liu, Bing He, Jun Zhou, Chi Liu, Liyun Hao, Shoujun Dai, Yunfeng Qi, Xiaolong Chen

Proceedings Volume 8551, High-Power Lasers and Applications VI; 85510P (2012) https://doi.org/10.1117/12.999551
Event: Photonics Asia, 2012, Beijing, China

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.

Citation Download Citation

Houkang Liu, Bing He, Jun Zhou, Chi Liu, Liyun Hao, Shoujun Dai, Yunfeng Qi, and Xiaolong Chen "Coherent beam combination of seven high power fiber amplifers with an all-optical feedback loop", Proc. SPIE 8551, High-Power Lasers and Applications VI, 85510P (29 November 2012); https://doi.org/10.1117/12.999551

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