公开(公告)号：EP1723475A2

公开(公告)日：2006-11-22

申请号：EP04814031.3

申请日：2004-12-10

申请人： DCE Aprilis, Inc.

发明人： WALDMAN, David A. ,  BUTLER, Christopher J. ,  RAGUIN, Daniel H.,

IPC分类号： G03H1/10

CPC分类号： G03H1/182 ,  G03H1/28 ,  G03H2260/12 ,  G11B7/0065 ,  G11B7/268

摘要： Holographic data storage systems are fixed after exposure during which data in the form of holograms are stored at locations in the medium (4). Sufficient fixing energy in the form of light or other electromagnetic and thermal radiation is applied to the media (4) either by flooding the media, or to specific locations where the medium has been written. The energy is sufficient to expose the recorded medium (4) to prevent recording in the unused dynamic range thereof. Such recording can be a spurious recording made during readout or from spurious sources of light incident on the media. In one embodiment, the reference beam (108) produced in the course of holographic recording is redirected to locations on the media (4) which have already been recorded. The redirected beam post exposes the media to fix these locations against spurious recording. The integrity of the holographic data storage systems and the robustness thereof is improved by fixing methods and apparatus incorporating the invention.

公开(公告)号：EP1586097A2

公开(公告)日：2005-10-19

申请号：EP04703664.5

申请日：2004-01-20

申请人： Aprilis, Inc.

发明人： WALDMAN, David A. ,  BUTLER, Christopher J. ,  RAGUIN, Daniel H.

IPC分类号： G11C13/04

CPC分类号： G03H1/02 ,  G03H1/26 ,  G03H1/265 ,  G03H2001/0216 ,  G03H2223/24 ,  G11B7/0065 ,  G11C13/042

摘要： A method and an apparatus for recording at least two multiplexed holograms. The object beam (103) and the reference beam (113) generated by a coherent light source (100). Either an object beam or reference beam is reflected from at least one portion of an aspherical reflecting surface (115) causing the object beam and the reference beam to intersect and form an interference pattern at a plane defined by the intersection of the object and reference beams at a selected storage location (118) in a recording media (116). At least one of a portion of the reference beam impinging on a recording media at the selected storage location and a portion of the object beam impinging on the recording media at the selected storage location is rotated through a selected azimuthal angle about an axis (129) that lies in the plane formed by optical axes of the portions of the object beam and the reference beam impinging on the recording media, wherein the axis passes through a plane defined by the intersection of the object beam and the reference beam in the recording media, and wherein an angle between optical paths of the portions of the object beam and the reference beam impinging on the recording media is preserved.