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

• Published in: Chinese physics B no. 9; pp. 374 - 378
• Main Author: 王小林 周朴 马阎星 马浩统 许晓军 刘泽金 赵伊君
• Format: Journal Article
• Language: English
• Published: 2010
• Subjects: 主振荡功率放大器; 受激布里渊散射; 混合动力; 激光器阵列; 激光放大器; 相位控制; 相干光束
• ISSN: 1674-1056; 2058-3834

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.