Coherent beam combining of hybrid phase control in master oscillator-power amplifier configuration |
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Authors: | Wang Xiao-Lin Zhou Pu Ma Yan-Xing Ma Hao-Tong Xu Xiao-Jun Liu Ze-Jin and Zhao Yi-Jun |
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Abstract: | 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 increases1.57 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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Keywords: | fibre laser coherent beam combining hybrid phase control stochastic parallel gradient descent algorithm |
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