Patent ID: 6366369
Filing Date: 2002-04-02
Classification: G02B,G03H

Abstract:
A process for fabricating a transmission hologram which, when reconstructing illumination light is entered therein, diffracts a reconstruction wavefront in a direction opposite to the direction of incidence thereof, comprising steps of:entering an object wavefront from a subject and a first reference wavefront into mutually opposite sides of a first hologram photosensitive material so that the object wavefront and the first reference wavefront interfere to record a reflection type of first hologram therein, disposing a second hologram photosensitive material on a side of the first hologram on which the first reference wavefront has been incident for recording the first hologram, wherein first reconstructing illumination light is entered into the first hologram through the second hologram photosensitive material to diffract a reconstruction wavefront and, at the same time, a second reference wavefront having the same wavelength is entered into a side of the first hologram that faces away from the side thereof on which the first reconstructing illumination light has been incident at an angle deviating from a Bragg diffraction condition for interference fringes recorded in the first hologram to record a second hologram therein by interference of, at least, said reconstruction wavefront and transmission light of the second reference wavefront which has transmitted through the first hologram, and disposing a third hologram photosensitive material on a side of the second hologram on which the first reconstructing illumination light has been incident for recording of the second hologram, wherein second reconstructing illumination light corresponding to the transmission light of the second reference wavefront that has transmitted through the first hologram for recording of the second hologram is entered into a side of the second hologram facing away from the third hologram photosensitive material to diffract a reconstruction wavefront to record a third hologram in the third hologram photosensitive material by interference of the reconstruction wavefront and transmission light of the second reconstructing illumination light that has transmitted through the second hologram.