Coherent light generators – Particular active media – Semiconductor
Patent
1997-11-18
1999-11-02
Bovernick, Rodney
Coherent light generators
Particular active media
Semiconductor
372 75, 372 43, 369112, 350394, H01S 319
Patent
active
059784040
ABSTRACT:
A laser beam emission apparatus that may be used as a universal optical pickup laser light source. The apparatus may be used in various applications including recording/reproduction of data to/from various types of optical disks in various recording/reproducing modes. The apparatus includes a first semiconductor laser chip that emits a first laser beam at a first wavelength, and a second semiconductor laser chip that emits a second laser beam at a second wavelength different from the first wavelength. The emitted second laser beam has a plane of polarization that is perpendicular to the plane of polarization of the emitted first laser beam. The apparatus further includes a polarized beam splitter that transmits one of the laser beams and reflects the other laser beam, and a semiconductor substrate that has the laser chips and the polarized beam splitter mounted thereon. The polarized beam splitter is mounted on the semiconductor substrate in a manner such that a polarized light division surface of the polarized beam splitter is perpendicular to the substrate surface of the semiconductor substrate, and the principal optical axes of the first and second laser beams intersect at a single point on the polarized light division surface and also lie in the same plane. The plane is positioned apart from the substrate surface of the semiconductor substrate, and is perpendicular to the polarized light division surface of the polarized beam splitter.
REFERENCES:
patent: 4634232 (1987-01-01), Tateoka
patent: 5598394 (1997-01-01), Hibino et al.
Bovernick Rodney
Kim Sung T.
Sankyo Seiki Mfg. Co. Ltd.
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