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。
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.
所述筷套由长短、大小与筷子本体相配合的筒体和设置在筒体底部的底面组成。
The chopstick sleeve consists of a cylinder body that is matched with the chopstick body on length and size, and a bottom surface arranged at the bottom part of the cylinder body.
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