Fourier-transform holography by pseudo-random phase shifting

Details Fourier-transform holography by pseudo-random phase shifting Fourier-transform holography by pseudo-random phase shifting

G - Physics

03

H

88/0.13

G03H 1/16 (2006.01) G02B 5/18 (2006.01) G03H 1/32 (2006.01)

Patent

CA 1053042

Abstract of the Disclosure A phase mask comprised of a rectangular array of phase shifting areas arranged in a pseudo-random pattern is illuminated with a beam of electromagnetic radiation. The array of pseudo-randomly phase shifted beams is focused on a Fourier transform plane on which the power spectrum of the beams distributes in two orthogonal directions from its center maxima. The phase shifting areas are arranged in such a manner that there is an approximately equal number of phase shifts for each of the different phase shifting areas with a constant phase relation between orthogonally adjacent phase shifting areas. The center maxima of the spectrum is confined to a rectangular-shaped area and uniformly distributed by suitably selecting the number of different phase shifts. Coherent noise on the reconstructed image is effectively eliminated. - 1 -

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