Patent ID: 7588863

Claim:
A hologram recording method, which comprises: a first step of producing a latent image by holographic exposure of a hologram recording material, wherein the hologram recording material comprising a dye precursor that is a combination comprising at least an acid-induced color forming dye precursor and an acid generator; and a second step of causing a polymerization reaction due to the latent image, so as to form a first interference fringe providing a refractive index modulation, wherein the latent image is a second interference fringe, the first interference fringe having a diffraction efficiency which is at least 5 times larger than that of the second interference fringe; wherein each of the first step and the second step is dry process; wherein the first step is a step of producing a colored material to form the latent image, the colored material having no absorption of a hologram reproducing light; and the second step is a step of causing the polymerization reaction upon irradiating the colored material with a light which has a wavelength different from that of the holographic exposure, so as to form the first interference fringe providing the refractive index modulation, wherein the light irradiated in the second step has a wavelength where a sensitizing dye, capable of being excited upon the holographic exposure in the first step, has a molar absorption coefficient of 5,000 or less.