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为进一步提高神光-Ⅲ原型装置8束三倍频激光焦斑的能量集中度,需要对神光-Ⅲ原型装置的全光路系统波前进行校正。其中的关键技术之一就是要准确获得全光路系统的波前畸变。神光-Ⅲ原型装置的8束激光主放诊断包内均配置了一套哈特曼波前传感器,可以较为方便地获得主放大系统输出波前,但却无法直接获得靶场系统波前。解决方法主要有逆向标定和靶点直接测量两种,通过比较两种方法的技术复杂性、测量准确性等指标,结合对校正前后远场焦斑的测量,最终确定采用靶点直接测量的方法能简单、有效地获得全光路系统波前畸变。
In order to further improve the energy concentration of the triple-frequency laser focal spot of SG-Ⅲ prototype device, the wavefront of the all-optical system of SG-Ⅲ prototype device needs to be corrected. One of the key technologies is to accurately obtain the wavefront distortion of the whole optical system. SG-III prototype device 8 laser beam primary diagnostic package are equipped with a set of Hartmann wavefront sensor, you can more easily access to the main amplifier output wavefront, but can not directly get the wave field of the shooting range system. The solution mainly includes reverse calibration and direct measurement of the target. By comparing the technical complexity and measurement accuracy of the two methods, combined with the measurement of the far-field focal spot before and after calibration, the method of directly measuring the target is finally determined All-optical system wavefront distortion can be easily and effectively obtained.