光学学报, 2020, 40 (10): 1014002, 网络出版: 2020-04-28
基于光外差锁相的激光偏振控制与高偏振消光比的光束合成 下载: 1115次
Polarization Control and Laser Combination with High Polarization Extinction Ratios Based on Optical Heterodyne Detection and Phase Locking
激光光学 相干偏振光束合成 光外差探测 偏振相位控制 偏振消光比 laser optics coherent polarization beam combination optical heterodyne detection polarization phase control polarization extinction ratio
摘要
激光相干偏振合成(CPBC)是获得高亮度线偏振激光输出的有效方法。基于此,提出一种光相位调制技术,将两路光相位差转变为幅度调制,进行光外差偏振相位探测和线性锁相控制,实现了两路同频率激光光束的相干偏振合成。理论上详细分析了光外差偏振相位探测的理论模型和线性锁相控制环路的数学模型,用于优化系统参数。锁相控制后,合成光束的输出功率为352.4 mW,偏振消光比高达17.67 dB,系统的控制带宽约为66.1 kHz,剩余相位噪声为1×10 -4 rad·Hz -1/2(1 Hz)和3×10 -6 rad·Hz -1/2(>100 Hz)。相比于其他CPBC的锁相方法,该方法对偏振消光比以及控制带宽都有明显的提升,有效地抑制了相位噪声。
Abstract
Coherent polarization beam combination (CPBC) is an effective method to obtain the high-brightness laser with linear polarization. This paper proposed an optical phase modulation method to transform the phase difference between two laser beams into amplitude modulation. Using optical heterodyne phase detection and linear phase-locked control, the polarization beam combination of two laser beams with the same frequency was realized. Further, the mathematical models of optical heterodyne polarization phase detection and linear phase-locked control loop were theoretically analyzed in detail for optimizing the system parameters. After phase locking, the polarization extinction ratio of the combined beam achieves 17.67 dB with the combined power of 352.4 mW, while the control bandwidth is nearly 66.1 kHz. The residual phase noise is 1×10 -4 rad·Hz -1/2(1 Hz) and 3×10 -6 rad·Hz -1/2(>100 Hz). Compared with other CPBC phase-locking methods, the proposed method can significantly improve polarization extinction ratio and control bandwidth, and effectively suppress phase noise.
邹星星, 沈辉, 全昭, 尤阳, 刘美忠, 张璟璞, 何兵, 周军, 张建华. 基于光外差锁相的激光偏振控制与高偏振消光比的光束合成[J]. 光学学报, 2020, 40(10): 1014002. Xingxing Zou, Hui Shen, Zhao Quan, Yang You, Meizhong Liu, Jingpu Zhang, Bing He, Jun Zhou, Jianhua Zhang. Polarization Control and Laser Combination with High Polarization Extinction Ratios Based on Optical Heterodyne Detection and Phase Locking[J]. Acta Optica Sinica, 2020, 40(10): 1014002.