利用腔内凹面镜控制输出光束稳定性的激光系统

An Auto-alignment and Stabilization Cavity Laser System by Use of an Intracavity Concave Mirror

本文给出了一种控制正支共焦非稳腔输出光束稳定性的激光系统。利用哈特曼波前传感器实时测量谐振腔内的倾斜扰动像差,基于该像差信号,采用一台步进电机作为主控器,并采用比-积分-微分(PID)控制算法控制一块高反射率的凹面腔镜完成腔内倾斜扰动的自动校正。理论和实验研究表明:本系统能够快速稳定地控制正支共焦非稳腔失调引起的倾斜像差,实现正支共焦非稳腔输出光束的自动稳定。

To improve the output laser beam quality of a positive-branch confocal unstable resonator, an auto-alignment and stabilization cavity laser system is presented. The tilt aberration measured by a Hartmann-Shack （H-S） sensor is taken as the feedback parameter, and a step-motor is used to control the concave cavity mirror, and a classic PID algorithm is adopted to compensate for the tilt aberration and stabilize the output laser beam. Theoretical and experimental results proved that this system can correct the tilt aberration in real time and the output laser beam becomes stable when the aberration is moved out.