Coherent beam combining of hybrid phase control in master oscillator-power amplifier configuration

A novel scalable architecture for coherent beam combining with hybrid phase control involving passive phasing and active phasing in master oscillator-power amplifier configuration is presented. Wide-linewidth mutually injected passive phasing fibre laser arrays serve as master oscillators for the po...

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Bibliographic Details
Published inChinese physics B Vol. 19; no. 9; p. 094202
Main Authors Xiao-Lin, Wang, Pu, Zhou, Yan-Xing, Ma, Hao-Tong, Ma, Xiao-Jun, Xu, Ze-Jin, Liu, Yi-Jun, Zhao
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.09.2010
Subjects
Active control
Amplifiers
Beams (radiation)
Coherence
Fibre
Lasers
Phase control
Phasing
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Summary:A novel scalable architecture for coherent beam combining with hybrid phase control involving passive phasing and active phasing in master oscillator-power amplifier configuration is presented. Wide-linewidth mutually injected passive phasing fibre laser arrays serve as master oscillators for the power amplifiers, and the active phasing using stochastic parallel gradient descent algorithm is induced. Wide-linewidth seed laser can suppress the stimulated Brillouin scattering effectively and improve the output power of the fibre laser amplifier, while hybrid phase control provides a robust way for in-phase mode coherent beam combining simultaneously. Experiment is performed by active phasing fibre laser amplifiers with passive phasing fibre ring laser array seed lasers. Power encircled in the main-lobe increases 1.57 times and long-exposure fringe contrast is obtained to be 78% when the system evolves from passive phasing to hybrid phasing.
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ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/9/094202