但是，由于涉及椭圆积分，一般又不具有均匀电荷环空间势分布的对称性，求解和讨论是比较困难的。
However, because this problem involves elliptic integrals, generally not possessing symmetry of a uniformly charged ring, it is difficult to solve and discuss it.
确定了当入射光场为椭圆高斯分布时，获得圆对称聚焦光斑的条件。
Conditions by which a circular symmetrical focussed spot can be obtained when the incident laser beam is an elliptical Gaussian profile are determined.
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