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在波前校正过程中,变形镜(DM)在强激光连续辐照(CW)下会产生热形变,进而对入射光引入附加波前畸变,从而制约了变形镜的波前校正效果,致使光束质量改善效果变差。从变形镜热形变面形的Zernike多项式分解出发,建立了强激光连续辐照下变形镜的热形变预估模型,根据预估所得的热形变面形,模拟计算得到了变形镜的驱动器控制信号参数,进而驱动变形镜对其自身的热形变面形进行了实时补偿。仿真结果表明,该自校正方法能有效补偿变形镜自身的热形变面形,减小变形镜热形变对其校正能力的影响;采用局部换热方式只能在一定程度上减小变形镜形变面形引起的平移相差和离焦相差,对光束质量的改善效果也比较有限,而该自校正方法能有效减小热形变引起的光程差,从而对光束质量起到明显的改善作用。
During the wavefront correction, the deformable mirror (DM) generates thermal deformation under strong laser continuous irradiation (CW), and then introduces additional wavefront distortion to the incident light, which restricts the wavefront correction effect of the deformable mirror and causes the light beam Quality improvement effect worsened. Based on the Zernike polynomial decomposition of the deformable surface of the deformable mirror, a thermal deformation prediction model of the deformable mirror under a continuous laser irradiation was established. According to the predicted thermal deformation surface shape, the drive control signal of the deformable mirror Parameters, and then drive the deformable mirror on its own thermal deformation surface real-time compensation. The simulation results show that the self-correction method can effectively compensate the thermal deformation surface of the deformable mirror and reduce the influence of the deformable mirror thermal distortion on the correction capability. The local heat transfer method can only reduce the deformable mirror deformation surface The phase shift caused by the shape and the difference between the defocus and the beam quality improvement effect is relatively limited, and the self-correction method can effectively reduce the thermal distortion caused by the optical path difference, which played a significant role in improving the quality of the beam.