公开(公告)号：US3625583A

公开(公告)日：1971-12-07

申请号：US3625583D

申请日：1968-07-15

Applicant: IBM

Inventor： FAN GEORGE J ,  GREINER JAMES H

IPC: G03H1/02 ,  G03H1/16 ,  G11C13/04 ,  G02B27/00 ,  G02F1/22

CPC classification number: G03H1/16 ,  G03H1/02 ,  G03H2001/026 ,  G03H2222/33 ,  G03H2224/06 ,  G03H2240/25 ,  G03H2260/35 ,  G11C13/043

Abstract: A hologram is produced that is erasable. The erasable storage medium is a thin layer of a europium chalcogenide, i.e., europium oxide, on which the hologram is recorded. The medium chosen on which to record a hologram is erasable and shows no degradation for repetitive storage and erasures. A powerful laser beam is employed for recording purposes in that short powerful light pulses are needed to record on materials having short thermorelaxation times.

公开(公告)号：US3643233A

公开(公告)日：1972-02-15

申请号：US3643233D

申请日：1969-01-15

Applicant: IBM

Inventor： FAN GEORGE J ,  GREINER JAMES H

IPC: G11C13/04 ,  G11C11/22 ,  G11C11/42

CPC classification number: G11C13/04

Abstract: A three-dimensional optical read-only memory is composed of a stack of transparent plates composed of either ferroelectric or ferromagnetic materials wherein binary information is stored as domains in each plate. The stack of plates containing the domains allows a polarized source of light to traverse the stack and appear, to a detecting device, as a homogeneous source. When an electromagnetic field is applied across a single plate in the stack, the polarization of the domains in that plate is rotated, creating a birefringence in the material. The polarized source of light is now modulated by such particularly selected plate according to this particular bit pattern of domains. This pattern can be imaged onto an array of detectors. When the electromagnetic field is removed, the disturbed domains return to their original storage states so that the polarized interrogating light reappears as a homogeneous source to all detectors.

Abstract translation: 三维光学只读存储器由由铁电体或铁磁材料构成的透明板堆叠组成，其中二进制信息作为域存储在每个板中。 含有这些结构域的一叠板允许偏振光源穿过堆叠并出现在检测装置上作为均质源。 当电磁场施加在堆叠中的单个板上时，该板中的畴的极化被旋转，在材料中产生双折射。 偏振光源现在由这种特别选择的平板根据这种特定的位图案来调制。 该图案可以成像到检测器阵列上。 当去除电磁场时，受干扰的域返回其原始存储状态，使得偏振询问光作为均匀源重新出现到所有检测器。