公开(公告)号：FR2380619A1

公开(公告)日：1978-09-08

申请号：FR7800739

申请日：1978-01-05

Applicant: IBM

Inventor： CASTRO GEORGE ,  HAARER DIETRICH ,  MACFARLANE ROGER M ,  TROMMSDORFF HANS P

IPC: G11B7/244 ,  G11B7/24 ,  G11C13/04

Abstract: Enhanced optical data memory system, a frequency selective optical memory device, non-permanent memory system, reversible memory system, improved three-dimensional data memory system, providing a fourth dimension to a three-dimensional holographic memory and providing an improved method of data storage. (Machine-translation by Google Translate, not legally binding)

公开(公告)号：CA1112365A

公开(公告)日：1981-11-10

申请号：CA291680

申请日：1977-11-24

Applicant: IBM

Inventor： CASTRO GEORGE ,  HAARER DIETRICH ,  MACFARLANE ROGER M ,  TROMMSDORFF HANS P

IPC: G11B7/244 ,  G11B7/24 ,  G11C13/04 ,  G11B13/04

Abstract: FREQUENCY SELECTIVE OPTICAL DATA STORAGE SYSTEM of the Invention An optical data storage system and method that utilizes the frequency dimension to increase the storage capacity significantly. The system includes a storage material, for example, in the form of a block, adapted to undergo a photo induced reaction upon exposure to light and which exhibits inhomogeneous absorption line broadening. Data bits are stored by selective photo induced reactions induced by a narrow band laser at specific frequencies within the broad inhomogeneous line. The lifetime of these photo induced data bits is of the order of years so as to provide a nonvolatile storage system. In a preferred embodiment, a material is selected so that the photo induced reaction can be made reversible thereby permitting, when desired, the erasing of the data bits.