可以对激光在谐振腔内的像散补偿进行定量的分析，通过选择合适的参数得到理想的像散，为激光谐振腔内的像散补偿提供了一定的理论支撑。(The astigmatism compensation of laser in the laser cavity can be　analyzed to some extent.The ideal astigmatism can be obtained by choosing the appropriate parameters, which provides a theoretical support for astigmatism compensation in laser resonator)