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    Reconstruction of information stored in only selected areas of a hologram
    2.
    发明授权
    Reconstruction of information stored in only selected areas of a hologram 失效
    仅在所选地区重新存储的信息

    公开(公告)号：US3556628A

    公开(公告)日：1971-01-19

    申请号：US3556628D

    申请日：1967-05-29

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： BURCKHARDT CHRISTOPH B

    IPC: G03H1/34

    CPC classification number: G03H1/34 ,  G03H1/202 ,  G03H2223/12 ,  Y10S359/90

    Abstract: WHEN THE INFORMATION STORED IN ONLY SELECTED AREAS OF A FIRST HOLOGRAM IS RECONSTRUCTED, THE OTHER AREAS OF THE HOLOGRAM OFTEN IMPAIR THE RECONSTRUCTION. TO AVOID THIS PROBLEM, A SECOND HOLOGRAM IS FORMED BY REPEATEDLY EXPOSING A RECORDING MEDIUM TO A REFERENCE BEAM AND TO LIGHT FROM AN ILLUMINATING BEAM THAT IS INCIDENT ON AND DIFFRACTED BY THE FIRST HOLOGRAM. AFTER EACH EXPOSURE, THE BEAM PROJECTED FROM THE FIRST HOLOGRAM TO THE SECOND HOLOGRAM IS TRANSLATED A DISTANCE EQUAL TO THE WIDTH, IN THE DIRECTION OF TRANSLATION, OF A SELECTED AREA, AND A COMPENSATING ADJUSTMENT IS MADE IN THE ANGLE AT WHICH THE ILLUMINATING BEAM IS INCIDENT ON THE FIRST HOLOGRAM.

    ENOUGH EXPOSURES ARE MADE SO THAT THE DISTANCE TRANSLATED EQUALS THE DISTANCE BETWEEN ADJACENT SELECTED AREAS. AS ALTERNATIVES, A LIPPMANN INTEGRAL PHOTOGRAPH MAY BE FORMED INSTEAD OF THE SECOND HOLOGRAM OR THE FIRST HOLOGRAM MAY BE VIEWED IN REAL TIME.

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