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为提高激光直接驱动聚变中球靶的辐照均匀性，必须对光束的排布进行优化。本文通过分析球谐模的几何因子，提出了光束排布的优化规则。按照这个规则排布光束，可在光束数有限的情况下获得较高的辐照均匀性。给出了满足此规则的一些典型光束排布实例。
In order to improve the radiation uniformity of laser-driven fusion target, the arrangement of the beam must be optimized. In this paper, by analyzing the geometrical factor of the spherical harmonic mode, the optimization rules of the beam arrangement are proposed. By arranging the beam in accordance with this rule, higher irradiance uniformity can be obtained with a limited number of beams. Some examples of typical beam arrangements that satisfy this rule are given.