Abstract: ight through a very small aperture is magnified by a lens, and beam profiles are measured at various points on each side of the image plane. The profiles are compared with the calculations done on several computer propagation programs in common use. While useful results were obtained from all the programs, there were significant differences in the fine structure of the calculated profiles. This was true when comparing programs and also when using the same kind of program with different numbers of transformation points or range of the transform. The difficulty of using simple Gaussian beam propagation theory on diffracted beams is pointed out. !0
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