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超短超强激光焦斑参数的精确测量是深入开展精密物理实验的前提。在SILEX-Ⅰ激光装置上,采用光学成像法和穿孔法测量了μJ级能量下的激光焦斑特性,采用光学成像方法得到了激光主瓣大小及能量集中度信息,通过穿孔法得到了激光能量透过率与不同大小孔径的关系曲线,并对两种方法得到的测量结果进行了比对研究。研究结果表明,光学焦斑测量法和穿孔法都可以比较准确地反映激光焦斑的能量分布情况,得到的能量分布偏差小于10%。
Precise measurement of ultra-short and super-intense laser focal spot parameters is the prerequisite for further development of precision physics experiments. On the SILEX-Ⅰ laser device, the laser focal spot characteristics at μJ level were measured by optical imaging method and perforation method. The information of laser main lobe size and energy concentration was obtained by optical imaging method. The laser energy Transmittance and different size of the aperture curve, and measured by the two methods were compared results. The results show that both optical focal spot measurement and perforation method can accurately reflect the energy distribution of the laser focal spot, and the deviation of the energy distribution obtained is less than 10%.