Patent ID: 6097513
Filing Date: 2000-08-01
Classification: G03H,G11B,G11C

Abstract:
A holographic memory device comprising:a light source for generating a beam;a beam splitter for dividing the beam into a reference beam and an object beam;a hologram memory part including a plurality of cells, that records corresponding information on the cells when both the reference beam and the object beam are incident thereon, and that reconstructs information recorded previously when only the reference beam is incident thereon;a first beam deflector that directs the reference beam towards the hologram memory part;a fine adjustment element that receives the reference beam, and that swivels to finely and accurately adjust the reference beam's path so as to be incident on the hologram memory part at a desired angle for information reconstructing when an angle of incidence of the reference beam for information reconstructing does not coincide with that of the reference beam for information recording, wherein the fine adjustment element has a minimum control step of no more than 0.001 degrees;a second beam deflector that directs the object beam towards the hologram memory part; andswiveling means, connected to and controlled by a computer, for adjusting a swiveling angle of the fine adjustment element.