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公开(公告)号：DE1547363A1
公开(公告)日：1969-11-13
申请号：DE1547363
申请日：1966-08-18
Applicant: IBM
IPC: G11C13/04
Abstract: 1,096,240. Modulating light. INTERNATIONAL BUSINESS MACHINES CORPORATION. Oct. 17, 1966 [Oct. 22, 1965], No. 46272/66. Heading H4F. [Also in Division G4] Information is stored in a crystal as the orientations of localized defects of lower symmetry than the symmetry of the crystal, electromagnetic radiation being used for writing information into the crystal. Dichroic defects may be orientated in one of two directions by light from one of two sources adapted to illuminate the crystal from different directions. The orientation established may be detected by measuring the transmitted intensity of light, having a lower incident intensity than for write-in, from one of the sources. Alternatively, M-centres in an alkali-halide crystal (KC1 and KI mentioned) may be orientated by plane polarized light from a selected one of two light sources, adapted to illuminate the crystal from different directions. In this case the orientation may be detected by measuring the transmitted intensity of plane-polarized light of a different wavelength incident on the crystal from a third direction. Other dichroic defects which may be used are suitable complexes of vacancies, interstitial atoms, impurity atoms, A-centres and other colour centres. Lasers may be used as light sources. Optical focusing may be provided for the light sources. An item of digital information may be stored by orientating similarly all the defects in a region of the crystal selected using light deflection apparatus to direct the light beams at the required region. Alternatively, a picture having contrast can be stored by varying the intensity of the writing light source from point to point, to produce variations in the concentration of defects having a particular orientation.
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