Optical head with polarized beam hologram

Details Optical head with polarized beam hologram Optical head with polarized beam hologram

1993-09-15

1994-05-24

Chin, Tommy P.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369 4437, 369 4441, G11B 700

Patent

active

053155742

ABSTRACT:
An optical head with a polarized beam hologram for optically recording and reproducing information on and from a recording medium. The optical head comprises an optical lens for converging a light beam emitted from a light source on the recording medium and a beam splitter provided between the light source and the optical lens for branching a light beam reflected from the recording medium. Also included in the optical head is a polarization type hologram for causing transmission or reflection of the light beam branched by the beam splitter and for polarizing the light beam so that a 0 order light and a + first-order diffracted light produced due to the polarization are cross polarized with respect to each other and the 0 order light and a - first-order diffracted light produced due to the polarization are cross polarized with respect to each other. The 0 order light, the + first-order diffracted light and the - first-order diffracted light from the hologram are respectively received by photodetectors.

REFERENCES:
patent: 4491940 (1985-01-01), Tinet
patent: 4649351 (1987-03-01), Velkamp et al.
patent: 4833561 (1989-05-01), Sunagawa et al.
patent: 4841507 (1989-06-01), Imai et al.
patent: 4858218 (1989-08-01), Takagi et al.
patent: 4879706 (1989-11-01), Lee
patent: 4918675 (1990-04-01), Lee
patent: 4929823 (1990-05-01), Kato et al.
patent: 4989189 (1991-01-01), Sander et al.

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