Patent ID: 8982437
Filing Date: 2015-03-17
Classification: G02B,G03F,G03H

Abstract:
1. A method of manufacturing a hologram recording film, the method comprising: forming a laminated structure by alternately laminating M (where M≧2) first photosensitive material precursor layers including a first photosensitive material and at least one (M-1) second photosensitive material precursor layer including a second photosensitive material on one another; forming at least three spacer layers, a spacer layer being formed on each of the first and second photosensitive material layers; in a first irradiation step, irradiating the entire laminated structure at least once from one face side of the laminated structure with a reference laser light beam and an object laser light beam to form interference fringes with respective pitch and slant angles for each of the first and second photosensitive material precursor layers; and in a second irradiation step, irradiating the entire laminated structure from the one face side of the laminated structure in a single irradiation operation such that decreasing amounts of irradiation are absorbed by each subsequent first and second photosensitive material precursor layer; and heating the entire laminated structure, wherein a combination of the second irradiation step and the heating step thereby causes the slant angles of the M first photosensitive material precursor layers to be different for each of the M first photosensitive material precursor layers while retaining the values of the pitches formed during the first irradiation operation, the pitch being defined on a face of the first photosensitive material precursor layer.