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公开(公告)号：DE69411290D1
公开(公告)日：1998-08-06
申请号：DE69411290
申请日：1994-01-26
Applicant: SONY CORP
Inventor： OKA MICHIO
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.
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公开(公告)号：DE69026601T2
公开(公告)日：1996-10-10
申请号：DE69026601
申请日：1990-11-15
Applicant: SONY CORP
Inventor： FUKUMOTO ATSUSHI , OKA MICHIO
IPC: G11B11/10 , G11B7/005 , G11B7/135 , G11B11/105 , G11B7/12
Abstract: A light beam emitted from a source of light is split by a light-splitting element into two light beams which are linearly polarised to meet at right angles with each other and which propagate in different directions. Then, a converter element changes the phase between the oscillation components of each light beam with respect to two orthogonal axes in a plane perpendicular to the beam path. This enables two differently polarised beams to overlap on the recording medium. Thus, the effective area of irradiation is made smaller than the actual beam spot size.
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公开(公告)号：DE69331788D1
公开(公告)日：2002-05-08
申请号：DE69331788
申请日：1993-06-17
Applicant: SONY CORP
Inventor： OKA MICHIO
Abstract: A laser beam generator (13) includes first and second mirrors (14R, 16R), a laser light source (11), a laser medium (15), a non-linear optical crystal element (16) and a birefringent element (14). The laser light source generates a pumping light beam. The laser medium (15), arranged between the first and second mirrors (14R, 16R) is irradiated with the pumping light beam via one of the mirrors (14R) to generate a fundamental laser beam based on the pumping light beam. The non-linear optical crystal element (16) is arranged between the first and second mirrors to generate a second harmonic laser beam under the type II phase matching as the fundamental laser beam from the laser medium (15) is passed through it in resonant oscillation. The birefringent element (14) has its one surface at a pumping light beam inlet side coated with a high reflectance coating (14R) and has its opposite surface parallel to it with a nonreflective coating (14T). The birefringent element (14) is set so that its optical axis is inclined at a predetermined azimuth angle with respect to the crystal axis of the non-linear optical crystal element (16). The surface of the birefringent element (14) coated with a high reflectance coating (14R) constitutes one of the first or second mirrors.
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公开(公告)号：DE69520487T2
公开(公告)日：2001-07-12
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.
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公开(公告)号：DE69319820T2
公开(公告)日：1998-12-03
申请号：DE69319820
申请日：1993-09-29
Applicant: SONY CORP
Inventor： KUBOTA SHIGEO , OKA MICHIO
Abstract: A system for correcting for positional deviations in a hand-held video camera caused by small movements or shaping of the user's hands includes an afocal optical system constituted by a positive meniscus lens and a negative meniscus lens. The positional deviations of the camera caused by minute tremors or shaking of the user's hands are detected by a pitch sensor and a roll sensor and micro-computer is responsive to the detected amount of the positional deviations to drive the positive meniscus lens and the negative meniscus lens in vertical and horizontal directions with respect to the optical axis, thereby controlling the position of the image pickup light being radiated onto a CCD image sensor of the video camera.
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Patent Agency Ranking
公开(公告)号：DE69317957T2
公开(公告)日：1998-11-19
申请号：DE69317957
申请日：1993-07-23
Applicant: SONY CORP
Inventor： EGUCHI NAOYA , OKA MICHIO
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.
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公开(公告)号：DE69026601D1
公开(公告)日：1996-05-23
申请号：DE69026601
申请日：1990-11-15
Applicant: SONY CORP
Inventor： FUKUMOTO ATSUSHI , OKA MICHIO
IPC: G11B11/10 , G11B7/005 , G11B7/135 , G11B11/105 , G11B7/12
Abstract: A light beam emitted from a source of light is split by a light-splitting element into two light beams which are linearly polarised to meet at right angles with each other and which propagate in different directions. Then, a converter element changes the phase between the oscillation components of each light beam with respect to two orthogonal axes in a plane perpendicular to the beam path. This enables two differently polarised beams to overlap on the recording medium. Thus, the effective area of irradiation is made smaller than the actual beam spot size.
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公开(公告)号：AU663563B2
公开(公告)日：1995-10-12
申请号：AU3391593
申请日：1993-03-01
Applicant: SONY CORP
Inventor： EGUCHI NAOYA , OKA MICHIO
Abstract: A laser light beam generating apparatus includes at least one light beam source (71), first (76) and second (77) reflectors, a non-linear optical crystal element (78) and an electromagnetic actuator (79). The light beam source (71) emits a light beam. The non-linear optical crystal element (78) is provided between the first reflector (76) and the second reflector (77). A light beam emitted from the light beam source (71) is incident on the non-linear optical crystal element (78) through the first reflector (76) and the second harmonic thereof is generated. The actuator actuates at least one of the first (76) and second (77) reflectors along an optical axis of the light beam emitted from the light beam source (71).
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公开(公告)号：DE69331453T2
公开(公告)日：2002-09-12
申请号：DE69331453
申请日：1993-06-17
Applicant: SONY CORP
Inventor： OKA MICHIO
Abstract: A laser beam generator (13) includes first and second mirrors (14R, 16R), a laser light source (11), a laser medium (15), a non-linear optical crystal element (16) and a birefringent element (14). The laser light source generates a pumping light beam. The laser medium (15), arranged between the first and second mirrors (14R, 16R) is irradiated with the pumping light beam via one of the mirrors (14R) to generate a fundamental laser beam based on the pumping light beam. The non-linear optical crystal element (16) is arranged between the first and second mirrors to generate a second harmonic laser beam under the type II phase matching as the fundamental laser beam from the laser medium (15) is passed through it in resonant oscillation. The birefringent element (14) has its one surface at a pumping light beam inlet side coated with a high reflectance coating (14R) and has its opposite surface parallel to it with a nonreflective coating (14T). The birefringent element (14) is set so that its optical axis is inclined at a predetermined azimuth angle with respect to the crystal axis of the non-linear optical crystal element (16). The surface of the birefringent element (14) coated with a high reflectance coating (14R) constitutes one of the first or second mirrors.
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公开(公告)号：DE68929398D1
公开(公告)日：2002-06-20
申请号：DE68929398
申请日：1989-02-13
Applicant: SONY CORP
Inventor： OKA MICHIO
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.
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