College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Opt Lett. 2009 Oct 1;34(19):2939-41. doi: 10.1364/OL.34.002939.
Multitone radiation is a promising technique to mitigate stimulated Brillouin scattering effects in narrow-linewidth fiber amplifiers. We demonstrate coherent beam combination of three two-tone fiber amplifiers using a stochastic parallel gradient descent (SPGD) algorithm. Phase control on the fiber amplifiers are performed by running the SPGD algorithm on a digital signal processor. The contrast of far-field intensity pattern of a coherently combined beam is more than 85%. Experimental results validate that a single-frequency seed laser is not indispensable for coherent beam combination in master oscillator power amplifier configuration.
多音辐射是一种有前途的技术，可以减轻窄线宽光纤放大器中的受激布里渊散射效应。我们使用随机并行梯度下降（SPGD）算法演示了三个双音光纤放大器的相干光束组合。通过在数字信号处理器上运行 SPGD 算法对光纤放大器进行相位控制。相干组合光束的远场强度模式对比度超过 85%。实验结果验证了在主振荡器功率放大器配置中，相干光束组合并不必需单频种子激光。
