研究结果表明：环状光束通过像散透镜后变为非旋转对称光束；
The results show that the annular beams become non-rotational symmetric after passing through an astigmatic lens.
本文通过计算指出环状分布的光束经透镜后可在焦平面产生适用于激光打孔的贝塞尔·高斯光束，这是一种高效、简单实用的方法。
Our calculations show that the Bessel-Gauss beam can be produced in the focused plane of the ring apertured Gaussian beam, this method is efficient and simple.
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