中国激光, 2010, 37 (7): 1713, 网络出版: 2010-07-13
基于液晶光调制器的激光相干合成主动相位控制
Active Phase Control in Laser Coherent Combination Based on Liquid Crystal Optical Modulator
相干光学 相位探测与控制 外差法 液晶相位调制器 coherence optics phase detection and control heterodyne method liquid phase modulator
摘要
在激光器阵列的相干合成技术中,并联主振荡功率放大器(MOPA)方案最关键的技术是对相干合成中的光路进行相位探测与控制。采用外差法,通过实时探测和校正光路中相位的变化,能够确保输出光束相位一致。相位调制器采用液晶相位调制器,主振荡激光器的波长为532 nm,输出功率0-6 W连续可调。外差法系统的移频量为40 MHz ,相位控制精度优于λ/7。在闭环控制过程中,液晶相位控制器较好地实现了信号光路的相位控制。
Abstract
In laser coherent combination,phase detection and control are most critical to master oscillator power amplifier (MOPA). Using heterodyne method,consistence of output beam phase can be ensured through real-time detection and correction of optical phase. The modulator is a liquid crystal optical phase modulator,the wavelength of the main oscillation laser is 532 nm,and the output power of laser can be adjusted continuously from 0 to 6 W. The shifted frequency of the heterodyne system is 40 MHz,and the accuracy for phase control is superior to λ/7. In the process of closed-loop control,a good signal phase correction of optical path has been achieved.
黄智蒙, 骆永全, 张大勇, 刘海涛. 基于液晶光调制器的激光相干合成主动相位控制[J]. 中国激光, 2010, 37(7): 1713. Huang Zhimeng, Luo Yongquan, Zhang Dayong, Liu Haitao. Active Phase Control in Laser Coherent Combination Based on Liquid Crystal Optical Modulator[J]. Chinese Journal of Lasers, 2010, 37(7): 1713.