The 260-W coherent beam combining of two compact fibre amplifier chains

doi:10.1088/1674-1056/20/11/114203

Abstract Coherent beam combining of two fibre amplifier chains with a total power of 260 W in a compact system using the stochastic parallel gradient descent (SPGD) algorithm is demonstrated. A 150 MHz linewidth fibre laser is built and introduced for high-power amplification to mitigate stimulated Brillouin scattering (SBS). Compact high-power amplifier chains are built with low power all-fibre system and high-power bulk free-optics fibre amplifiers. When the total power is about 260 W, active phase-locking of two high-power amplifiers is demonstrated using the SPGD algorithm. In closed-loop, the power in the main lobe increases 1.68 times, the visibility is increased from 0 to 0.62, and the phase residual error is less than $\lambda$/10.

Keywords: fibre amplifier coherent beam combining stimulated Brillouin scattering stochastic parallel gradient descent algorithm

Received: 21 February 2011
Revised: 11 June 2011
Accepted manuscript online:

PACS:	42.25.Kb	(Coherence)
	42.55.Wd	(Fiber lasers)
	42.65.Es	(Stimulated Brillouin and Rayleigh scattering)

Fund: Project supported by the Innovation Foundation for Graduates in National University of Defense Technology, China (Grant No. B080702).

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Wang Xiao-Lin(王小林), Ma Yan-Xing(马阎星), Zhou Pu(周朴), He Bing(何兵), Xue Yu-Hao(薛宇豪), Liu Chi(刘驰), Li Zhen(李震), Xiao Hu(肖虎), Xu Xiao-Jun(许晓军), Zhou Jun(周军), Liu Ze-Jin(刘泽金), and Zhao Yi-Jun(赵伊君) The 260-W coherent beam combining of two compact fibre amplifier chains 2011 Chin. Phys. B 20 114203

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The 260-W coherent beam combining of two compact fibre amplifier chains

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