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

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...

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Published inChinese physics B Vol. 20; no. 11; pp. 255 - 260
Main Author 王小林 马阎星 周朴 何兵 薛宇豪 刘驰 李震 肖虎 许晓军 周军 刘泽金 赵伊君
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.11.2011
Subjects
Algorithms
Amplification
Amplifiers
Beams (radiation)
Coherence
Fibre
Lasers
Lobes
光纤放大器
光纤激光器
光纤系统
受激布里渊散射
放大器链
相干光束
紧凑型
高功率放大器
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/20/11/114203

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Summary: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 λ/10.
Bibliography: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 λ/10.
fibre amplifier; coherent beam combining; stimulated Brillouin scattering; stochasticparallel gradient descent algorithm
Wang Xiao-Lin,Ma Yan-Xing,Zhou Pu,He Bing,Xue Yu-Hao,Liu Chi,Li Zhen,Xiao Hu,Xu Xiao-JunZ,hou Jun,Liu Ze-Jin,Zhao Yi-Jun（a College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China ;b Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China）
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/11/114203