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Fourier transform holography using pseudo-random phase shifting of object illuminating beams and apodization

  • US 4,013,338 A
  • Filed: 01/26/1976
  • Issued: 03/22/1977
  • Est. Priority Date: 05/13/1975
  • Status: Expired due to Term
First Claim
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1. A system for forming a hologram of an array of beams of electromagnetic radiation on a Fourier transform plane, comprising:

  • a pseudo-random phase mask receptive in use of a beam of electromagnetic radiation and comprised of a plurality of phase shifting areas arranged in a pattern of rows and columns, there being an approximately equal number of phase shifting areas for each of the different phase shifts, wherein the number of different phase shifts is N which is greater than three inclusive and each of the different phase shifts is one of the multiples of m360°

    /N, where m ranges from 1 to N, and the phase difference between orthogonally adjacent phase shifting areas is 360°

    /N, whereby the power spectrum of each of said phase-shifted beams on the Fourier transform plane distributes in orthogonal directions from the center maximum of the power spectrum;

    means for apodizing the phase-shifted beams; and

    means for recording a Fourier transform hologram of said phase-shifted, apodized beams.

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