Patent ID: 6674555
Filing Date: 2004-01-06
Classification: G03H,G11B

Abstract:
Apparatus for holographic recording of information, wherein:a) the apparatus comprises a lens or lens system, to be referred to as the FT lens, so situated that: light from an object beam enters the FT lens after being modulated by an object, and light leaving the FT lens impinges on a recording medium situated at a Fourier transform plane of the object with respect to the FT lens; b) the apparatus further comprises a phase element effectively juxtaposed with the object; c) the object is subdivided into pixels having a maximum center-to-center distance between adjacent pixels; d) the phase element is subdivided into pixels having a greater or smaller center-to-center distance than that between object pixels, as measured in at least one direction; e) the phase element has a correlation length greater than the maximum center-to-center distance between adjacent object pixels, and f) the phase element has a spatially varying pattern of phase modulation effective for at least partially redistributing illuminant intensity of the object beam in the Fourier transform plane.