Phase-distribution in and near the Bright Nucleus of an Aberration-free Diffraction Image

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IT was shown in the course of a recent investigation1 that the three-dimensional phase distribution very close to the geometrical focus of an aberration-free diffraction image in light of wave-length λ is substantially the same as that in a parallel beam of wave-length (1 — ¼ sin2 α)λ, travelling in the direction defined by the principal ray, where sin a denotes the numerical aperture of the converging pencil.

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  1. 1

    Linfoot, E. H., and Wolf, E., Proc. Phys. Soc., B (in the press).

  2. 2

    Zernike, F., and Nijboer, B. R. A., in “Théorie des Images Optiques” (Éditions de la Rev. d'Optique, Paris, 1949).

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