Using geometrical optics theory and off-axis aberration analysis, a set of crossed double strip integrators for high power CO_2 laser beam homogenizing has been designed.

利用几何光学原理和轴外像差理论，设计一种应用于大功率CO_2激光陶瓷烧结实验的反射型正交双带式积分镜均束装置。

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It is hard to design for beam expander with high power and wide aperture required, because it is shorten length, larger aperture, as well as on axis and off axis aberration must be corrected properly.

高倍率及大孔径扩束器要求筒长短、口径大、轴上和轴外的像差都要很好地校正，所以光学系统的设计是非常困难的。

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Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.

球差-使以不同孔径角穿过透镜(或从镜面上发射)的光线不能聚焦在轴上的同一点。

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