提出了一种实时测量大功率激光照射下聚焦镜产生的像差的新方法。 该方法利用混合模激光束在传输过程中光束横截面能量分布的变化来进行测量。 首先通过计算混合模激光束的光学参数来模拟其在传输过程中的光束横截面能量分布的变化, 然后计算其通过聚焦镜后在焦点位置的光束横截面能量分布, 通过对比计算所得的光束横截面能量分布和实际测量的焦点位置的光束横截面能量分布的差异, 得到聚焦镜的像差。

A new method of using blending mode laser beam to measure the spherical aberration is presented. First, the optical parameters of this beam are calculated to simulate its propagation. Then through calculation the transverse intensity distribution of the focus is got. By comparing this transverse intensity distribution with the measurement of the real distribution after beam passing through a focal mirror, the aberration of the mirror is obtained.