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基于严格求解Helmholtz方程的远场解，提出了一种描述远轴高斯光波传播的新方法．给出了高斯光波振幅、相位分布公式，讨论了光斑尺寸、发散角和能量守恒等关系．并指出任何高斯波的最大光束发散角为65.5°．Based on a rigorous far field solution of the Helmholtz equation, a new method to describe the propagation of the offaxial Gaussian wave is presented. The amplitude and phase distribution, beam spot size, divergence angle, and the relation of the conservation of energy are discussed. It is found that for any Gaussian source the maximum divergence angle is shown to be 65.5.
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