中国激光, 2011, 38 (8): 0802009, 网络出版: 2011-07-27
基于能动分块反射镜的七路激光阵列倾斜校正与相干合成实验研究
Tip-Tilt Correction and Coherent Combination of Seven-Channel Laser Array Based on Active Segmented Mirrors
激光光学 相干合成 能动分块反射镜 自适应光学 主振荡功率放大器 laser optics coherent beam combination active segmented mirror adaptive optics master oscillator power amplifier
摘要
提出了一种基于能动分块反射镜(ASM)的激光阵列相位控制新方法，用以解决激光主振荡功率放大(MOPA)器相干合成技术中的空间光束倾斜校准与输出端相位调制两大关键问题。介绍了7单元能动分块反射镜实现空间光调制的原理，并采用该器件成功验证了7路光束合成的方案。实验采用六棱反射锥进行光束合成，并采用两套控制回路分别实现了倾斜与平移校正，获得了小于25 μrad和λ/10的校正精度。闭环后，获得了主瓣占总功率31.73%的高质量相干耦合激光输出。
Abstract
A novel method for laser array phasing is proposed. The active segmented mirror (ASM) is adopted to solve two key problems in the coherent beam combination of master oscillator power amplifiers (MOPA-CBC). The two key problems are the alignment of spatial beamlets and the phase modulation on system′s output end. The modulation principle of a seven-element ASM is introduced. Based on this device, the experimental verification of a seven-channel laser array is successfully accomplished. The spatial beamlets combination is implemented by a hexagonal pyramid. Two individual control loops are adopted to implement the piston and tip-tilt corrections. The precisions achieve lower than 25 μrad and λ/10. In close loop, the combined output laser with high quality has been obtained. The power fraction in main lobe achieves is 31.73%.
郑轶, 王晓华, 沈锋, 李新阳. 基于能动分块反射镜的七路激光阵列倾斜校正与相干合成实验研究[J]. 中国激光, 2011, 38(8): 0802009. Zheng Yi, Wang Xiaohua, Shen Feng, Li Xinyang. Tip-Tilt Correction and Coherent Combination of Seven-Channel Laser Array Based on Active Segmented Mirrors[J]. Chinese Journal of Lasers, 2011, 38(8): 0802009.
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