HOLOGRAM RECORDING DEVICE AND ITS METHOD

摘要

PROBLEM TO BE SOLVED: To provide a device which is high in photosensitivity and is excellent in such non-destructiveness as to lessen signal deterioration at the time of reproduction by recording holograms on a recording material which is previously colored by irradiation with light of a short wavelength and is filled with carriers at an intermediate level by using a laser beam of the wavelength longer than the wavelength described above. SOLUTION: The holograms are recorded on the recording material which is previously colored by the irradiation with the light of the short wavelength and is filled with the carriers at the intermediate level by using the laser beam of the wavelength longer than the wavelength described above. Also, the recording material which exhibits photoinduction absorption is used. With this device, a preirradiation light source 21 which is a UV laser beam source of UV rays or the prescribed wavelength of visible light of a short wavelength develops the photoinduction absorption of the recording medium 10, i.e., had power sufficient for coloration. This device forms the light interference patterns of reference light and signal light in the recording medium 10 and records information as the changes in refractive indices. On the other hand, the recording medium 10 is irradiated with only the reference light 12b by shutting off the signal light 12a with a shutter 31a.