公开(公告)号：EP0731454A4

公开(公告)日：1997-02-26

申请号：EP95932193

申请日：1995-09-20

Applicant: SONY CORP

Inventor： KUBOTA SHIGEO ,  OKA MICHIO

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B7/24 ,  G11B7/26 ,  G11B19/12 ,  G11B20/00 ,  G11B23/28 ,  G11B23/36 ,  G11B7/095

CPC classification number: G11B7/127 ,  G11B7/0045 ,  G11B7/0903 ,  G11B7/0908 ,  G11B7/128 ,  G11B7/1372 ,  G11B7/24 ,  G11B7/26 ,  G11B20/00086 ,  G11B23/284 ,  G11B23/36 ,  G11B2019/121

Abstract: The intensity of an ultraviolet laser beam emitted from a UV laser beam source (1) is modulated based on additional information by an optical modulator (2), and directed to a mirror (14) through lenses (3, 4), a phase diffraction grating (5) and a half mirror (14). The laser beam is reflected from the mirror (14), focused by an objective lens (6) and then made to fall on an optical disc (8). Alternatively, an ultraviolet laser beam from a UV laser beam source (1) enters a phase diffraction grating through an optical modulator (2) and lenses (3, 4) and is divided into three beams by the phase diffraction grating (5). The three beams are applied to the optical disc (8) through a half mirror (11), a mirror (14) and an objective lens (6). Reflected light of visible laser beam from the optical disc (8) enters a half mirror (11), and is then reflected therefrom to enter an optical detector (13) through a cylindrical lens (12). The focusing control and tracking control are carried out on the basis of the output signal from this optical detector (13), whereby it is possible to form a spot of the ultraviolet laser beam in an accurate position in an additional information recording region and record the additional information thereon accurately.

公开(公告)号：EP1522885A4

公开(公告)日：2009-12-23

申请号：EP03764127

申请日：2003-07-02

Applicant: SONY CORP

Inventor： HASHIMOTO SHIGEKI ,  KIKUCHI HIROKI ,  OKA MICHIO

IPC: G02B27/18 ,  G02B27/00 ,  G02B27/14 ,  G02B27/48 ,  G03B21/00 ,  G03B21/14 ,  H01S3/10 ,  H01S3/101 ,  H04N9/31

CPC classification number: G02B27/143 ,  G02B19/0028 ,  G02B19/0057 ,  G02B27/1033 ,  G02B27/123 ,  G02B27/144 ,  G02B27/48 ,  G02B2207/117 ,  H04N9/3129

公开(公告)号：DE68929398T2

公开(公告)日：2002-12-19

申请号：DE68929398

申请日：1989-02-13

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/06 ,  H01S3/109 ,  H01S3/108

Abstract: A second harmonic generator having a non-linear optical crystal element for generating a second harmonic laser light. In this second harmonic generator, a birefringent element is inserted into a resonant optical path of a fundamental wave laser light, whereby the second harmonic laser light emitted as an output laser light is stabilized.

公开(公告)号：AT165173T

公开(公告)日：1998-05-15

申请号：AT93111875

申请日：1993-07-23

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  OKA MICHIO

IPC: H01S3/10 ,  G02F1/35 ,  G02F1/37 ,  H01S3/105 ,  H01S3/109 ,  H01S3/13 ,  H01S3/139

Abstract: In a laser beam generator for making wavelength conversion with an automatic control of the length of an external resonator (3) or the resonator of the laser souce (6), for achieving a high efficiency wavelength conversion, the servo pulling-in is performed by use of the resonator length error signal and the reflected light signal. A sample-and-hold means is used to detect the error signal from the detected light signal which is reflected from the external resonator.

公开(公告)号：DE69106581T2

公开(公告)日：1995-05-24

申请号：DE69106581

申请日：1991-05-16

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/08 ,  H01S3/109 ,  H01S3/139

Abstract: In a solid state laser apparatus, a fundamental laser beam generated in a laser medium is resonated so as to travel through a nonlinear optical crystal element provided within a resonator to thereby generate a secondary harmonic laser light. An optical element is provided within the resonator suppressing coupling caused by a sum-frequency generation between two polarization modes of the fundamental wave laser beam. A control device controls the effective resonator length of the resonator such that the two polarization modes of the fundamental wave laser beam become the same in oscillation intensity. Therefore, mode hopping noise caused by the mode coupling of the fundamental laser beam within the same polarization mode can be avoided and the oscillation can be stabilized.

公开(公告)号：DE69106581D1

公开(公告)日：1995-02-23

申请号：DE69106581

申请日：1991-05-16

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/08 ,  H01S3/109 ,  H01S3/139

Abstract: In a solid state laser apparatus, a fundamental laser beam generated in a laser medium is resonated so as to travel through a nonlinear optical crystal element provided within a resonator to thereby generate a secondary harmonic laser light. An optical element is provided within the resonator suppressing coupling caused by a sum-frequency generation between two polarization modes of the fundamental wave laser beam. A control device controls the effective resonator length of the resonator such that the two polarization modes of the fundamental wave laser beam become the same in oscillation intensity. Therefore, mode hopping noise caused by the mode coupling of the fundamental laser beam within the same polarization mode can be avoided and the oscillation can be stabilized.

公开(公告)号：AU580793B2

公开(公告)日：1989-02-02

申请号：AU4549185

申请日：1985-07-11

Applicant: SONY CORP

Inventor： FUKUMOTO ATSUSHI ,  OHSATO KIYOSHI ,  OKA MICHIO

IPC: G11B7/09

公开(公告)号：CA2090591C

公开(公告)日：2004-06-01

申请号：CA2090591

申请日：1993-02-26

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  OKA MICHIO

IPC: H01S3/08 ,  G02F1/35 ,  G02F1/37 ,  H01S3/082 ,  H01S3/108 ,  H01S3/109 ,  H01S3/139

Abstract: A laser light beam generating apparatus includes at least one light beam source, first and second reflectors, a non-linear optical crystal element and an actuator. The light beam source emits a light beam. The non-linear optical crystal element is provided between the first reflector and the second reflector. A light beam emitted from the light beam source is incident on the non-linear optical crystal element through the first reflector. The actuator actuates at least one of the first and second reflectors along an optical axis of the light beam emitted from the light beam source.

公开(公告)号：DE69520487D1

公开(公告)日：2001-05-03

申请号：DE69520487

申请日：1995-09-20

Applicant: SONY CORP

Inventor： KUBOTA SHIGEO ,  OKA MICHIO

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/09 ,  G11B7/125 ,  G11B7/127 ,  G11B7/128 ,  G11B7/135 ,  G11B7/1372 ,  G11B7/24 ,  G11B7/26 ,  G11B19/12 ,  G11B20/00 ,  G11B23/28 ,  G11B23/36 ,  G11B7/095

Abstract: The intensity of an ultraviolet laser beam emitted from a UV laser beam source (1) is modulated based on additional information by an optical modulator (2), and directed to a mirror (14) through lenses (3, 4), a phase diffraction grating (5) and a half mirror (14). The laser beam is reflected from the mirror (14), focused by an objective lens (6) and then made to fall on an optical disc (8). Alternatively, an ultraviolet laser beam from a UV laser beam source (1) enters a phase diffraction grating through an optical modulator (2) and lenses (3, 4) and is divided into three beams by the phase diffraction grating (5). The three beams are applied to the optical disc (8) through a half mirror (11), a mirror (14) and an objective lens (6). Reflected light of visible laser beam from the optical disc (8) enters a half mirror (11), and is then reflected therefrom to enter an optical detector (13) through a cylindrical lens (12). The focusing control and tracking control are carried out on the basis of the output signal from this optical detector (13), whereby it is possible to form a spot of the ultraviolet laser beam in an accurate position in an additional information recording region and record the additional information thereon accurately.

公开(公告)号：DE69411290T2

公开(公告)日：1999-02-18

申请号：DE69411290

申请日：1994-01-26

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/10 ,  G02F1/35 ,  H01S3/081 ,  H01S3/083 ,  H01S3/108

Abstract: A sum frequency conversion efficiency can be improved and operation can be stabilized. A laser generating apparatus comprises a nonlinear optical element (3) for generating a sum frequency light from first and second fundamental wave laser lights having first and second wavelengths ( lambda 1) and ( lambda 2) by introducing the above first and second fundamental wave laser lights thereto, and a resonator (7) having a first fundamental wave light source (1) and the nonlinear optical element (3) incorporated therein. The resonator (7) includes at least first and second reflection mirrors (M1) and (M2) disposed on opposing entrance and exit end faces of the nonlinear optical element (3) in an opposing relation. These first and second reflection mirrors (M1) and (M2) having transmissivities as high as possible relative to the second fundamental wave laser light and a sum frequency light. The first and second reflection mirrors (M1) and (M2) have reflectivities as high as possible relative to the first fundamental wave laser light, and incident axes of the first and second fundamental wave laser lights relative to these mirror surfaces are selected to be held on oblique directions which are not coincident with perpendicular lines of these mirror surfaces.