Optical system for preserving a state of polarization of light b

Details Optical system for preserving a state of polarization of light b Optical system for preserving a state of polarization of light b

Filed on

1991-02-19

Date issued

1993-04-13

Examiner

Arnold, Bruce Y.

Patent Class

Optical: systems and elements

SubClass

Optical modulator

SubSubClass

Light wave temporal modulation

Other Related Categories

359283, 359639, 360114, 365122, G02B 109, G02B 2712, G11B 5127

Type

Patent

Status

active

Patent number

052027899

Description

ABSTRACT:
First and second beam splitters are arranged on the optical path of a light beam emerging from a recording surface, and such that the phases and amplitudes of the respective polarized light components of a light beam incident thereon are changed to equal extends. As a result of this arrangement, the state of polarization beam of the light beam emerging from the recording surface is maintained when a light beam is outputted through the two beam splitters. Stable reproduction signals and servo control signals for focusing, tracking, and the like can be reliably supplied by utilizing an apparatus of this invention.

REFERENCES:
patent: 4124273 (1978-11-01), Hulgnard et al.
patent: 4439014 (1984-03-01), Stacy et al.
patent: 4451913 (1984-05-01), Elliott
patent: 4682311 (1987-07-01), Matsusayashi et al.
patent: 4729122 (1988-03-01), Itoh
patent: 4825428 (1989-04-01), Toki
patent: 4933794 (1990-06-01), Gitto
patent: 5004326 (1991-04-01), Sasaki
Optics-Chapter 16, pp. 346-357, Fincham et al., Walter Henry Anpel distribution-9th edition, 1980.

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