列阵透镜对能量测量影响的分析

结合列阵透镜的透过率分析了其后的光场分布。列阵透镜由多个列阵元拼接而成，用以改善主透镜焦点附近能量分布的均匀性。列阵透镜在提高辐照均匀性的同时，给能量测量带来了不利的影响。这是由于经过列阵元的相邻子光束会产生干涉，干涉条纹处的激光能量密度和功率密度相应都大为增加，其数值在干涉区域中心处能上升到原来的4倍。更高的能量密度和功率密度对能量计提出了更苛刻的要求。在没有采取适当措施的时候使用，就会损坏能量计。

The distribution of optical field passing through lens array is analyzed. Lens array consists of many array units, which can improve energy distribution uniformity around the focus of main lens. Lens array improves illumination, but it brings bad affection to energy measurement. The reason is that intervention will happen between sub-beams after the array units, thus energy density and power density of laser on the interference stripes will increase sharply. Its value will augments to four times contrasting to former one. The higher energy and power need more severe criteria to calorimeter. If proper means is not taken in use, calorimeter will be destroyed.