Title:
HIGH AREAL DENSITY HOLOGRAPHIC DATA STORAGE SYSTEM
Document Type and Number:
WIPO Patent Application WO2004112045
Kind Code:
A3
Abstract:
An apparatus for recording or reading high areal density holographically stored information with high signal-to-noise ratio. The apparatus comprises a holographic imaging system for recording or reconstructing a holographic image, having a first numerical aperture and a first focal length and an additional optical system for filtering the signal beam, having a second numerical aperture and a second focal length, wherein the numerical aperture of the additional optical system is less than the numerical aperture of the holographic imaging system and/or the focal length of the additional optical system is greater than the optical length of the holographic imaging system.
Inventors:
BUTLER CHRISTOPHER J (US)
WALDMAN DAVID A (US)
WALDMAN DAVID A (US)
Application Number:
PCT/US2004/018116
Publication Date:
December 22, 2005
Filing Date:
June 07, 2004
Export Citation:
Assignee:
APRILIS INC (US)
BUTLER CHRISTOPHER J (US)
WALDMAN DAVID A (US)
BUTLER CHRISTOPHER J (US)
WALDMAN DAVID A (US)
International Classes:
G11B7/0065; G11B7/135; G11C13/04; (IPC1-7): G11B7/0065; G11C13/04
Domestic Patent References:
| WO2004102541A1 | 2004-11-25 |
Foreign References:
| EP0476536A2 | 1992-03-25 | |||
| US6272095B1 | 2001-08-07 | |||
| US6147782A | 2000-11-14 | |||
| US6322931B1 | 2001-11-27 | |||
| US20020122254A1 | 2002-09-05 |
Other References:
SZARVAS G ET AL: "Multilayer thin-film holographic storage - a new approach", 2002 INTERNATIONAL SYMPOSIUM ON OPTICAL MEMORY AND OPTICAL DATA STORAGE TOPICAL MEETING, 7 July 2002 (2002-07-07), WAIKOLOA, HI, USA, pages 240 - 242, XP010600186
PU ALLEN ET AL: "High-density recording in photopolymer-based holographic three-dimensional disks", 10 May 1996, APPL OPT; APPLIED OPTICS MAY 10 1996 OPTICAL SOC OF AMERICA, WASHINGTON, DC, USA, VOL. 35, NR. 14, PAGE(S) 2389 - 2398, XP002311676
PU ALLEN ET AL: "High-density recording in photopolymer-based holographic three-dimensional disks", 10 May 1996, APPL OPT; APPLIED OPTICS MAY 10 1996 OPTICAL SOC OF AMERICA, WASHINGTON, DC, USA, VOL. 35, NR. 14, PAGE(S) 2389 - 2398, XP002311676
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