Abstract
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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References
Linfoot, E. H., and Wolf, E., Proc. Phys. Soc., B (in the press).
Zernike, F., and Nijboer, B. R. A., in “Théorie des Images Optiques” (Éditions de la Rev. d'Optique, Paris, 1949).
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LINFOOT, E., WOLF, E. Phase-distribution in and near the Bright Nucleus of an Aberration-free Diffraction Image. Nature 178, 691–692 (1956). https://doi.org/10.1038/178691b0
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DOI: https://doi.org/10.1038/178691b0
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