Optical device for magneto-optical disc system

Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – In combination with or also constituting light responsive...

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257 84, 257 85, 257 98, 257432, 372 50, 372 99, 372101, 372102, 369109, 369110, 369122, H01L 2715, H01L 3112, H01L 31153, H01L 3300

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056082339

ABSTRACT:
An optical device for detecting a magneto-optical signal can be simplified and miniaturized in arrangement. An optical device for detecting a magneto-optical signal includes an optical element (101) in which a light-emitting portion (4) and a light-receiving portion (5) are closely disposed on a common substrate and in which reflected-back light obtained from a magneto-optical medium (34) after light emitted from the light-emitting portion (4) was reflected on the magneto-optical medium (34) is detected at a position near confocal position by the light-receiving portion (5). The light-receiving portion (5) on the optical element (1) has a light-receiving surface inclined relative to the optical axis of the reflected-back light formed thereon so that the light-receiving portion has a polarization selective transmittance function on its surface. Thus, the reflected-back light from the magneto-optical medium (34) can be received and detected by the light-receiving portion (5) on the optical element (101).

REFERENCES:
patent: 5233595 (1993-08-01), Kawakubo
patent: 5349210 (1994-09-01), Ackley et al.
patent: 5352919 (1994-10-01), Takano
patent: 5406543 (1995-04-01), Kobayashi et al.
No Author, "Vertically Emitting Diode Laser with Integrated Front-Beam Monitor Photodiode," IBM Technical Disclosure Bulletin, vol. 32, No. 8A, Jan. 1990, pp. 149-150.

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