Patent ID: 6275310
Filing Date: 2001-08-14
Classification: G03H

Abstract:
A process of designing Fourier transform holograms and to synthesize the phase and amplitudes of a far field diffraction pattern of an optical wave,A first selecting step for selecting desired far field pattern of the optical wave; performing a Fourier transform using the fast Fourier transforms or identities from a table of Fourier transform pairs on the desired far field pattern of the optical wave to get a desired source distribution description that determines desired complex valued pixel amplitudes a.sub.ci for each pixel i; andA second selecting step for selecting pixel modulation, setting a.sub.I for each pixel i from the limited values available to a pixel by a combination of pseudorandom encoding for values of a.sub.ci within the PRE encoding range of the with pixel, and by modified minimum distance encoding selection method for values of a.sub.ci outside the PRE encoding range for the with pixel, wherein said second selecting step uses a blend of modified minimum distance encoding and pseudorandom encoding in laser pattern generation in which the pixel modulation values are quantized in three or more complex values.