Optical relay for pixel-based holographic storage and retrieval

Details Optical relay for pixel-based holographic storage and retrieval Optical relay for pixel-based holographic storage and retrieval

1999-02-25

2000-08-22

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

For producing or reconstructing images from multiple holograms

359 29, 359 30, 359 11, 365125, G03H 126, G03H 116, G03H 100, G03H 112, G11C 1304

Patent

active

061081108

ABSTRACT:
A holographic storage and retrieval system for use in co-propagating or counter-propagating geometries having a common optical relay for guiding a signal beam and a reference beam along a common optical axis to a holographic medium to write a hologram therein. The optical relay has an object region imaging quality such that at least 65% and preferably at least 80% of the nominal luminous energy from object pixels is encompassed or "ensquared" by the corresponding image pixels. Additionally, the optical relay has a high total numerical aperture (N.A.) of about 0.83, a pixel N.A. of approximately 0.04 for the signal beam. The system of the invention can be used with holographic storage media in the form of disks, tapes or bulk holographic crystals.

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patent: 5719691 (1998-02-01), Curtis et al.
Darskii, A. et al., Volume holograms with a monodisperse speckle reference wave, Sov. J. Quantum Electron, 19(5), pp. 688-690, May 1989.
Darskii, A. et al., Shift selectivity of holograms with reference speckle wave, Opt. Spectrosc. (USSR) 65(3), pp. 392-395, Sep. 1988.

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