强激光与粒子束, 2011, 23 (4): 875, 网络出版: 2011-05-26
基于并行梯度下降算法模拟高功率固体激光装置的相干合成
Coherent beam combination simulation of high-power solid state lasers using stochastic parallel gradient descent algorithm
相干合成 光学追迹 衍射计算 高功率固体激光 并行梯度下降算法 tilt/tip-piston镜 coherent beam combination ray tracing diffraction calculation high-power solid state lasers stochastic parallel gradient descent algorithm tilt/tip-piston mirror
摘要
多路光的相干合成是高功率固体激光装置的关键技术之一。基于合成模型, 对4组tilt/tip-piston镜采用并行梯度算法, 通过模拟计算实现了光束间的位相锁定和相干合成。结果表明有限次算法迭代次数内, 相干合成时远场焦斑10 μm半径范围内的强度比约为非相干合成时的4倍。基于高频响应驱动器和对应的高速控制算法将有可能实现高功率固体激光装置多路输出光束间的相干合成。
Abstract
Coherent combination of multiple segmented beams is one of the critical technical issues of high-power solid state lasers. Coherent beam combination by four group tilt/tip-piston mirrors is simulated by the stochastic parallel gradient descent (SPGD) algorithm. Locking phases is performed by running the SPGD algorithm on a coherent beam combination model. The results show that the far-field intensity ratio of four coherent beam combination within the 20-μm-diameter spot is nearly four times higher than that of incoherent beam combination in finite iterations. Simulation results validate that coherent beam combination could be realized with high-frequency response actuators and corresponding high-speed control algorithm.
杨雨川, 罗晖, 李富全, 王逍, 黄小军, 冯斌, 景峰. 基于并行梯度下降算法模拟高功率固体激光装置的相干合成[J]. 强激光与粒子束, 2011, 23(4): 875. Yang Yuchuan, Luo Hui, Li Fuquan, Wang Xiao, Huang Xiaojun, Feng Bin, Jing Feng. Coherent beam combination simulation of high-power solid state lasers using stochastic parallel gradient descent algorithm[J]. High Power Laser and Particle Beams, 2011, 23(4): 875.
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