高功率激光装置光束自动准直系统设计

Design of High Power Laser Beam Automatic Alignment System

利用TMCM-351E驱动控制板卡及自编的自动准直控制软件对高功率激光装置光束进行检测和准直,并设计了一套新型光路监测准直系统。采用变结构控制算法实现了近远场基准中心和光斑中心的自动提取,有效地提高了系统的精度、稳定性和准直效率。在实验平台上进行了验证。实验结果表明,相对传统监测准直方法,该监测准直系统平均准直误差为空间滤波器小孔直径的0.9%,能够满足准直系统远场调整精度(小于小孔直径的5%)和近场调整精度(小于小孔直径的1%)的要求,在连续10h测试过程中,角度抖动为±12.6μrad,显示出高的稳定性。该系统在某高功率激光装置的光路自动准直中得到有效应用。实际验证表明,8路预放光路准直时间小于3min,主放光路准直时间小于7min。

High power laser device beam is detected and aligned with TMCM 351E device control board and a self- made automatic alignment procedures, and a set of novel optical monitoring alignment system is desigred. With the use of variable structure control algorithm, automatic extraction of the near and far field reference center and the spot center are achieved, and automatic alignment procedures are realized with high stability, high precision and high efficiency. Experiments are conducted on platform to verify the performance of the alignment system. Experimental results show that, compared to traditional method, the adjusted average error of spatial filter pinhole diameter is 0.9% in the monitoring collimation system, which can meet the precision requirement of far field adjusting collimation system （less than 5 % of small hole diameter） and near field adjusting collimation system （less than 1% of small diameter）. Stability test of 10 h shows that the control system has good stability with angle jitter of ± 12.6μrad. The system is verified in the high power laser device. The alignment time of eight pre-light road is less than 3 min and the alignment time of the main light path is less than 7 min.