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1·Aided by the two virtual images of the seam light source on the seam plane observed at the back of the prism, it can reach the systematic coaxis by regulating them to symmetrize the seam.

本文借助于在棱镜后面所观察到的在缝平面上的缝光源之二虚像，并通过把它们调至对缝严格对称，迅速达到系统的共轴要求。

2·In view of the above, the transformation properties of astigmatic elliptic Gaussian beams are analysed overall, the exact formulas of correcting astigmatism and rotary symmetrize transformation.

分析像散椭圆高斯光束的传输变换特性，推导出半导体激光束的像散校正与旋转对称化变换公式。