Patent ID: 6538775
Filing Date: 2003-03-25
Classification: G02B,G02F,G03H

Abstract:
A method of making a holographic polymer dispersed liquid crystal (H-PDLC) optical device, comprising:providing a film comprised of a mixture of a liquid crystal and a photopolymerizable monomer between opposing substrates; splitting a beam of laser energy from a laser energy source into a plurality of laser beams; and directing said plurality of beams onto the sample to form a plurality of interference patterns capable of providing different liquid crystal gratings in the film; placing a mask between each of said laser energy beams and said film, each said mask forming a pattern of light and dark regions on said film and each said mask positioned such that at least one light region of a first beam pair coincides with at least one dark region of a second beam pair within the film; and illuminating the film whereby photo-polymerization of the monomer takes place and formation of holographic elements having different liquid crystal spacing occurs.