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摘要:
针对高能 器出光过程中出现的大量离焦和0°像散低阶像差这一现象，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离焦像差表达式，该XY离焦像差系数大小可直接表征X离焦和Y离焦的波前PV值。同时，通过微调高能 器中二维整形光路中的镜子间距，可实现 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，而后计算机再根据XY离焦像差系数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 器输出光束XY离焦量的PV值由5.2 μm和1.1 μm校正到0.5 μm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。Abstract: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, this study utilizes the Hartmann wavefront sensor 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 XY defocus aberrations from 5.2 μm and 1.1 μm to less than 0.5 μm, as well as a decrease in
β factor from 3.1 to 1.8, resulting in substantial improvement in beam quality.-
Key words:
- high energy laser/
- beam quality/
- aberration correction/
- beam shaping/
- matrix optics
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图 1（a）离焦波前形状和（b）0°像散波前形状
Figure 1.(a) Defocus wavefront and (b) 0° Astigmatism wavefront
图 4低阶像差校正实验系统原理图
Figure 4.Schematic diagram of low-order aberration correction experiment system
图 5高精度电动平移台实物图
Figure 5.Physical picture of a high-precision electric displacement platform
图 6理论XY离焦量随镜子共焦间距相对偏离量的变化曲线。（a）X方向整形光路和（b）Y方向整形光路
Figure 6.Curve of theoretical XY defocus with relative displacement of mirror co-focal spacing. (a) X-direction and (b) Y-direction shaping optical paths.
图 7像差未校正时XY离焦量变化曲线
Figure 7.PV curve of XY defocus aberrations with uncorrected aberration
图 9像差未校正时 器输出功率随时间的变化曲线
Figure 9.Laser output power curve over time with uncorrected aberration
图 10像差闭环校正时XY离焦量变化曲线
Figure 10.PV curve of XY defocus aberrations with closed-loop aberration correction
图 11像差闭环校正时出光4.2 s时刻的远场光斑
Figure 11.Far-field spot at 4.2 s with closed-loop aberration correction
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