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对一个任意的傍轴光束，只要给定了任一起始截面上的光场分布情况，则其在自由空间中传输的统计行为就可完全确定了，而且可用“等效高斯光束”来进行描述。给出了相应的传输参数，它们完全确定于起始截面的光场分布情况。利用“嵌入高斯光束”的概念将文献［５］中的结果推广到更为普遍的情形。
For an arbitrary paraxial beam, the statistical behavior of its transmission in free space can be completely determined given the distribution of the light field at any initial cross-section and can be described by an “equivalent Gaussian beam” . The corresponding transmission parameters are given, which are completely determined by the light field distribution in the initial section. The concept of “embedded Gaussian beams” is used to generalize the results in [5] to the more general case.