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准确预校正大能量激光发射时的动态波前像差是高功率激光驱动器自适应光学波前质量控制的关键。基于闭环预校正实验数据,利用神光II升级装置波前传输模型计算动态波前预校正偏差,获得更为准确的变形镜校正面形;再利用基于驱动器位置相位校正的变形镜控制算法修正变形镜的驱动电压,可提高动态波前预校正的准确性,降低激光装置大能量发射实验时输出光束的波前残余像差。在神光II升级激光装置上采用该技术获得了比传统的基于闭环预校正的波前控制技术更好的波前控制效果,使得大能量激光发射实验中光束顺利过孔,保障了装置的安全运行,并且明显改善了输出光束的波前质量,提高了大能量激光发射实验的成功率。
Accurate pre-correction of dynamic wavefront aberration during high-power laser emission is the key to adaptive optical wavefront quality control of high-power laser drivers. Based on the experimental data of closed-loop pre-calibration, the wavefront pre-calibration bias of the dynamic wavefront was calculated by using the wavefront transmission model of SG upgrade device to obtain a more accurate deformation mirror surface shape. Then the deformation mirror control algorithm based on the phase position of the driver was used to correct the deformation The driving voltage of the mirror can improve the accuracy of the dynamic wavefront pre-calibration and reduce the wavefront residual aberration of the output beam during the large-energy emission experiment of the laser device. The use of this technology in the ShenGuang II upgrade laser device achieves a better wavefront control effect than the conventional wavefront control technology based on the closed loop pre-correction, which ensures the safety of the device through the smooth passing of the light beam in the high-energy laser emission experiment Run, and significantly improve the quality of the output beam front wave and improve the success rate of high-energy laser emission experiment.