摘要
针对高能激光器出光过程中出现的大量离焦和0°像散低阶像差现象,提出了基于哈特曼波前传感器和二维整形光路的XY离焦像差校正方法。首先,通过对Zernike多项式的离焦项和0°像散项进行线性组合得到XY离焦像差的表达式,该XY离焦像差系数的大小可直接表征X离焦和Y离焦的波前PV值。同时,通过微调高能激光器中二维整形光路中的镜子间距,可实现激光器输出光束XY离焦波面的补偿。因此,首先利用哈特曼波前传感器提取出光束的XY离焦像差系数大小,而后再根据XY离焦像差系数的大小实时闭环微调二维整形光路中的镜子间距,从而实现XY离焦像差的校正,改善输出光束的光束质量。实验结果表明,该方法可有效地将高能激光器输出光束XY离焦量的PV值由5.2μm和1.1μm校正到0.5μm以下,相应的光束质量β因子由3.1降到1.8,光束质量得到明显改善。
A method for correcting XY defocus aberrations,based on Hartmann-Shack wavefront sensor and two-dimensional beam-shaping light path,was presented due to the large percentage of defocus and 0°astigmatism aberrations with large PV values in high-energy laser beam.The first step is to derive an expression for XY defocus aberrations by linearly combining the defocus and 0°astigmatism terms of Zernike polynomials.The coefficients directly characterize the wavefront peak-to-valley(PV)values of X and Y defocus.At the same time,compensation for XY defocus wavefronts of the laser beam can be achieved by fine-tuning the mirror spacing in the two-dimensional shaping optics of the high-energy laser.Therefore,the Hartmann wavefront sensor is used to extract the coefficients of XY defocus aberrations from the laser beam.The computer dynamically adjusts the mirror spacing in the two-dimensional shaping optics based on these coefficient values to correct XY defocus aberrations and improve the beam quality of the output laser beam.The results of the experiment showcase a significant decrease in PV value of XY defocus aberrations from 5.2μm and 1.1μm to less than 0.5μm,as well as a decrease inβfactor from 3.1 to 1.8,resulting in substantial improvement in beam quality.
作者
冯亚飞
韦承甫
任晓明
郭建增
王杰
FENG Ya-fei;WEI Cheng-fu;REN Xiao-ming;GUO Jian-zeng;WANG Jie(The 718 Research Institute,China State Shipbuilding Corporation Limited,Handan 056027,China)
出处
《中国光学（中英文）》
EI
CAS
CSCD
北大核心
2024年第2期366-373,共8页
Chinese Optics
基金
国家高技术发展计划(No.51326010201)。
关键词
高能激光
光束质量
像差校正
光束整形
矩阵光学
high energy laser
beam quality
aberration correction
beam shaping
matrix optics
