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基于腔内振荡激光波前曲率半径自再现条件,研究了腔内元件离焦对非稳腔腔内振荡激光参数的影响。在4片薄片串接的放大率为1.8的虚共焦非稳腔中,根据实验测量不同抽运功率下薄片的离焦量,当单个薄片具有焦距为-100 m离焦时,激光-增益区交叠效率会降低9%,腔放大率升高至2.3,并因腔内激光尺寸与薄片有效孔径失配新增30%的腔内损耗,这些影响均会导致激光光光效率的降低。对比了几种离焦补偿方法,发现腔内插入变焦透射元件可以在大动态范围内实现较好的补偿效果。实验中,在腔内插入特别设计的光焦度可在-0.016 m-1到0.060 m-1调节的变焦透镜组,在4840 W抽运条件下,离焦补偿后输出激光功率可以提升2.33倍,并且通过检测单程探测光束的波面特性,对激光器动态补偿,实现了1~100 Hz重复频率下单脉冲能量10 J激光输出。
Based on the self-reproducing conditions of the wavefront radii of the laser cavity, the effects of the defocusing of the cavity components on the laser parameters in the cavity are analyzed. The experimentally measured the amount of defocus of the sheet at different pumping powers with a 4-sheet tandem with a confocal quasi-steady-state at a magnification of 1.8, with a laser-gain of a single sheet with a focal length of -100 m The area overlap efficiency will be reduced by 9%, the cavity magnification will increase to 2.3, and the new 30% cavity loss due to the cavity laser size mismatch with the sheet effective aperture mismatch will lead to the reduction of laser light efficiency. Comparing several defocus compensation methods, it is found that the insertion of the zoom transmission element in the cavity can achieve better compensation effect in the large dynamic range. In the experiments, a specially designed zoom lens set with a focal power of -0.016 m-1 to 0.060 m-1 was inserted into the cavity, and the output laser power after defocus compensation could be increased by 2.33 times at 4840 W pumping condition , And by detecting the wavefront characteristics of one-way probe beam, the laser dynamic compensation, to achieve a single pulse energy of 1 ~ 100 Hz repetitive frequency 10 J laser output.