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介绍了随机并行梯度下降(SPGD)算法,并设计了基于此算法的两路主振荡并联放大相干合成(MOPA-CBC)实验系统。该系统采用10 W级掺镱光纤放大器引入相位误差,同时采用铌酸锂相位调制器进行校正。开环时,分析了放大器工作在不同状态下系统中的相位噪声。闭环后,得到了稳定的相干合成光束,合成光束的平均亮度提高到之前的1.5倍,相位平移峰谷(PV)值降低到100.8 nm,系统校正精度达到1/(10λ),控制带宽约为100 Hz。实验结果表明,SPGD算法能有效地发挥锁相控制功能。
The algorithm of random parallel gradient descent (SPGD) is introduced and a two-primary parallel oscillating coherent amplification (MOPA-CBC) experimental system based on this algorithm is designed. The system uses 10 W-class Ytterbium-doped fiber amplifier to introduce phase error, while using lithium niobate phase modulator for correction. Open-loop analysis of the amplifier operating in different states of the phase noise in the system. After the closed loop, a stable coherent synthesized beam was obtained. The average brightness of the synthesized beam was increased by 1.5 times and the phase shift peak-to-valley (PV) value was reduced to 100.8 nm. The system calibration accuracy reached 1 / (10λ) 100 Hz. The experimental results show that the SPGD algorithm can effectively use the phase-locked control function.