Optical recording apparatus and optical...

Details Optical recording apparatus and optical... Optical recording apparatus and optical...

2006-12-26

2006-12-26

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

C359S030000

Reexamination Certificate

active

07154646

ABSTRACT:
An optical recording/reproducing apparatus having excellent resistance against vibration and noise. In recording, coherent light is polarization-modulated with a spatial light modulator to generate signal light and reference light whose polarization directions are crossed at right angles. The signal light permeates a polarizing beam splitter, and is incident to a quarter wavelength plate. The reference light passes through a passing hole, is diffused by a light diffuser and is incident to the quarter wavelength plate. The reference and signal light are converted into circularly polarized light which revolve in directions opposite to each other and condensed by a condenser lens, and then a predetermined area of an optical recording medium is irradiated with the reference and signal light. Thus, the reference and signal light are generated by modulating the incident light from the same light source and are coaxially incident to the polarizing beam splitter.

REFERENCES:
patent: 6452890 (2002-09-01), Kawano et al.
patent: 6909529 (2005-06-01), Curtis
patent: A 11-311938 (1999-11-01), None
Katsunori Kawano et al. “Holographic Recording and Retrieval of Polarized Light by Use of Polyester Containing Cyanoazobenzene Units in the Side Chain” Sep. 15, 1999 pp. 1269-1271 of vol. 24, No. 18,Optics Letters.

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