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Coherent beam combining of 137 W 2 × 2 fiber amplifier array

✍ Scribed by Xiaolin Wang; Yanxing Ma; Pu Zhou; Bing He; Hu Xiao; Yuhao Xue; Chi Liu; Zhen Li; Xiaojun Xu; Jun Zhou; Zejin Liu; Yijun Zhao

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
820 KB
Volume
284
Category
Article
ISSN
0030-4018

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✦ Synopsis

We demonstrate coherent beam combining of two-dimensional fiber amplifier arrays with a total of 137 W output power using stochastic parallel gradient descent (SPGD) algorithm. Compact all-fiber polarizationmaintained single frequency fiber amplifier chains are developed and four fiber amplifiers are arranged to 2 × 2 laser array with a fill factor of 70% in the near-field. Active phase control is implemented by a digital signal processor (DSP) based SPGD controller. The fringe visibility of the coherent combined beam profile is as high as 81% when the system is closed-loop controlled despite perturbations of the environment.

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