内腔自适应光学系统校正激光器畸变

固体激光器中,增益介质由于热沉积产生的热畸变严重影响了激光器的稳定性、输出功率和光束质量。研究了一种内腔自适应光学系统校正激光器腔内畸变的方法,利用微机电变形反射镜作为固体激光器的内腔全反射镜,通过控制变形镜的面型改善激光器输出光束的模式及功率。从腔外引入的一束信标光通过激光器内腔后反射出腔外,用波前探测器可测得激光器工作时腔内畸变对此信标光的影响,并通过搭建的自适应光学系统平台可闭环校正此畸变。实验结果表明,闭环校正后,激光器的输出功率提高了近3倍,且激光光束质量得到了明显的改善。

Lasers Aberration Compensation Using an Intra-Cavity Adaptive Optical System

Thermal induced distortion in the gain element is the main obstacle to be overcome in the scaling of solid-state lasers to very high output powers.The method of compensating the aberration by using an intracavity adaptive optical system was studied.A MEMS deformable mirror using as the intra-mirror of the solid-state laser could improve the mode and output power of the laser.The effect of the intra-cavity aberration to the beaconing light form out-cavity could be measuredwith a wave-front detector and an adaptive optic system has been used to compensate the aberration.The experimental result shows that the output power is increased nearly 3 times and the beam profiles are improved obviously by closed loop automatic optimization of the adaptive optic system.