【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。更多还原

【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.更多还原