VOLUME HOLOGRAPHIC MEMORY OPTICAL INFORMATION RECORDING REPRODUCING DEVICE

Japanese Patent JP3674903

B2

PROBLEM TO BE SOLVED: To obtain a reproducing device which can record an interference pattern with high density and which is compatible by preliminarily forming a nonvolatile refractive index grating corresponding to the three dimensional optical interference pattern between a signal light beam and a referential light beam.
SOLUTION: The signal beam passes through a shutter 6a, light beam expander 14, spacial optical modulator 12 and Fourier transformation lens 13 and enters a volume holographic memory 10. The referential light beam is reflected by mirrors 17, 18 to enter the volume holographic memory 10 and is crossed in the medium with the signal light beam from the lens 13 to interfere to produce three-dimensional interference fringes. The gate light from a superluminescent diode 30 activates or inactivates the refractive index.grating according to the presence or absence of the optical interference pattern in the volume holographic memory 10. Thereby, when data is to be recorded, the signal light, referential light and gate light are made to irradiate a specified position in the volume holographic memory 10 in recording the date as a refractive index grating.

Satoru Tanaka
Asano Takano
Hideki Hatano
Yoshinao Ito
Matsushita Gen
Takashi Yamaji

JP9174999A

July 27, 2005

March 31, 1999

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Pioneer Corporation

G03H1/02; G03H1/04; G03H1/22; G03H1/26; G11B7/00; G11B7/0065; G11C13/04; (IPC1-7): G03H1/02; G03H1/26; G11C13/04

JP11509954A
JP2000512422A

WO1997043669A1
WO1997020317A1

Motohiko Fujimura

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