Patent ID: 6165648
Filing Date: 2000-12-26
Classification: G03F,G03H,G11B

Abstract:
Method comprising holographic recording in a recording medium, said recording being attended by photopolymerization within selectively irradiated regions, such medium comprising an active layer for recording radiation-defined features, whereby refractive index is changed responsive to radiation, the layer containing polymerized matrix material serving as a host to ""actinic"" monomeric material which responds to such radiation by photopolymerization, said recording including holographicexposure comprising irradiating at least a portion of the layer with overlapping radiation beams, thereby forming a hologramCHARACTERIZED IN THATsaid polymerized matrix material is produced by in-situ polymerization of a polyfunctional oligomer of molecular weight .gtoreq.1000 during a precuring step conducted prior to said holographic exposure, and in that at least 70 wt. % of total monomeric material is monofunctional.