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公开(公告)号：JPH11150318A
公开(公告)日：1999-06-02
申请号：JP31813697
申请日：1997-11-19
Applicant: SONY CORP
Inventor： MASUDA HISASHI
Abstract: PROBLEM TO BE SOLVED: To improve utilization efficiency of a laser beam, by reducing a frequency at which resonator length control is temporarily stopped. SOLUTION: A search control section 29 predicts a direction and searches a state in which resonator length control can be effected in the predicted direction. That is, when a servo temporary stop determination section 28 determines to temporarily stop the servo control of resonator length, the section 29 predicts, using a predetermined resonator length as a reference, a direction in which a time interval between the resumption of the resonator length control and the next temporary stop of the resonator length control becomes long from the direction of increasing the resonator length and the direction of decreasing the resonator length, and searches a state in which the resonator length control can be effected in the predicated direction. Further, when the resonator length control is ready to be effected through the search, the section 29 informs the section 28 to that effect, and the section 28 resumes the servo control. As a result of these operations, the resonator length control is effected so that the same oscillation frequency can be provided again.
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公开(公告)号：JPH11109426A
公开(公告)日：1999-04-23
申请号：JP26850697
申请日：1997-10-01
Applicant: SONY CORP
Inventor： WADA HIROYUKI , MASUDA HISASHI , KONDO KENJI , OKA MICHIO
IPC: G02F1/37
Abstract: PROBLEM TO BE SOLVED: To provide an optical system capable of obtaining stable output (stable wavelength conversion output, etc.), by suppressing the generation of a transverse mode occurring in the presence of a scattering body, etc., and the optical crystals, etc., to be used with the optical system having at least one of optical parts, exclusive of mirrors within a stable resonator, for example, the wavelength conversion optical system using an external resonator. SOLUTION: An aperture having a hole of a diameter of 1 to 10 times the ray at >=1 point A within the stable resonator having the optical crystal, etc., the optical parts (optical crystal 5, etc.), exclusive of the mirrors 1 to 4 or a slit having a width of 1 to 10 times the ray or an aperture of an arbitrary shape having an edge is installed at this point. A knife edge having the edge part of a straight line or curve is otherwise installed in such a manner that the part nearest the ray is 1 to 10 times the radius of the ray from the center of the ray.
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公开(公告)号：JPH09318985A
公开(公告)日：1997-12-12
申请号：JP13366996
申请日：1996-05-28
Applicant: SONY CORP
Inventor： KUBOTA SHIGEO , MASUDA HISASHI , BUERUNAA BUIHIMAN
Abstract: PROBLEM TO BE SOLVED: To prevent a remarkable peak from being generated in nonlinear optical crystal even when the power of an inputted basic wave to has its wavelength converted by converging the basic wave on in the nonlinear optical crystal is high. SOLUTION: This device is so constituted that the spot diameter of the basic wave at its convergence point is 0.0014-0.0023cm and the crystal length of the nonlinear optical crystal is 0.5-1.2cm. When the spot diameter is within this range, the light intensity distribution in the nonlinear optical crystal is a top hat type even if the power of the inputted basic wave is high, so that no peak is generated.
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公开(公告)号：JPH07183606A
公开(公告)日：1995-07-21
申请号：JP34609993
申请日：1993-12-21
Applicant: SONY CORP
Inventor： MASUDA HISASHI , UDAGAWA TOSHIKI , ARAI MICHIO
Abstract: PURPOSE:To suppress the average current value of a drive current supplied, and improve the conversion efficiency of waves by nonlinear optical phenomena, and besides, lessen battery power depletion by adding a modulation means to a drive means so as to modulate and convert the drive current. CONSTITUTION:In a drive power source 2, a pulse drive circuit 5 drives an ACC drive circuit by pulses and supplies a semiconductor laser part 3 with pulse currents Ip. The semiconductor laser part 3 drives a semiconductor laser drive 7 and the emitted light is condensed by a converging lens 8, and is emitted to a wavelength converter. In the wave length converter, the light emitted from the semiconductor laser part 3 is entered into a laser oscillator 12, and an Nd:YAG laser medium 10 is excited by the exciting light emitted from the semiconductor laser device 7, and the wavelength of this emitted laser beam is converted into one of green visible light by KPT 11, and is emitted, being amplified in the solid laser oscillator 12. Hereby, the average drive current value is made small, whereby the wavelength conversion efficiency can be improved.
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公开(公告)号：JPH06164039A
公开(公告)日：1994-06-10
申请号：JP30910092
申请日：1992-11-18
Applicant: SONY CORP
Inventor： UDAGAWA TOSHIKI , MASUDA HISASHI , SUGIURA MINAKO
Abstract: PURPOSE:To reduce the noise level of a second-harmonic laser beam in a low-fre quency region by a method wherein the high-frequency component of a laser beam which has been passed through a resonator block is detected, it is fed back to an excitation light source and the noise of the second-harmonic laser beam generated by the resonator block is reduced. CONSTITUTION:A noise signal obtained from the high-frequency component of one part of a second-harmonic laser beam generated by a resonator block 11 is negatively fed back by a negative-feedback loop system 35, it is added to an LD constant-current drive circuit 31 in a constant-current drive system 34 at a timing at which a temperature control system 27 is operated, and a laser diode 12 is driven. Since an excitation laser beam generated by the laser diode 12 for excitation use and a second-harmonic laser beam generated by the resonator block 11 are correlated electrically and optically, the generation of the second-harmonic laser beam can be controlled by controlling the driving current of the laser diode 12. Consequently, the noise level on the low-frequency side of the second-harmonic laser beam can be reduced.
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Patent Agency Ranking
公开(公告)号：JPH05291675A
公开(公告)日：1993-11-05
申请号：JP11423792
申请日：1992-04-08
Applicant: SONY CORP
Inventor： KUBOTA SHIGEO , MASUDA HISASHI
Abstract: PURPOSE:To correct anisotropy of an emitting angle of an exciting laser light, to improve lateral and longitudinal symmetry of an exciting area in a laser medium and to enhance an S/N ratio by providing an exciting laser light source having anisotropy of an emitting angle and at least one diffraction grating to the resonator. CONSTITUTION:A gain waveguide type laser diode 11 of a semiconductor laser element as an exciting laser light source has anisotropy of an emitting angle. An exciting laser light emitted from the diode 11 is incident to laser medium 16. A phase diffraction grating 21 is disposed fixedly at an opposite side of a resonator 13 of a condensing lens 12 to a concave mirror 14 between the diode 11 and the resonator 13. A plurality of images are focused in a connecting perpendicular direction of the diode 11 by the grating 21 to increase the exciting luminous flux width in the perpendicular direction, thereby approaching it to the exciting luminous flux width of a connecting parallel direction.
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公开(公告)号：JPH05145151A
公开(公告)日：1993-06-11
申请号：JP33011591
申请日：1991-11-19
Applicant: SONY CORP
Inventor： MASUDA HISASHI
Abstract: PURPOSE:To enable an aberration as an entire image-forming system to be minimized and an excitating light to be converged on a solid state laser medium with a high light density even for a large number of wavelengths over a wide range of excitating light. CONSTITUTION:A condenser lens 9 allows output light of semiconductor lasers 1 to 3 from collimators 4 to 6 to be converged on a solid state laser medium 11 and the solid state laser medium 11 to be excited, where the collimaters 4 to 6 are constituted so that a color aberration for a wavelength where a color cannot be erased by the condenser lens 9 out of the wavelength of light from the semiconductor lasers 1 to 3 is compensated.
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38.发明专利
公开(公告)号：JPH05109079A
公开(公告)日：1993-04-30
申请号：JP26793591
申请日：1991-10-16
Applicant: SONY CORP
Inventor： KANEDA YUJI , KUBOTA SHIGEO , MASUDA HISASHI
Abstract: PURPOSE:To improve the S/N and C/N of a resonance type optical recording medium and, at the same time, to increase the recording density of the medium by multilevel recording by adopting a new recording and reproducing method. CONSTITUTION:A first and second reflecting surfaces 2 and 3 having desired reflectivity are formed in parallel with each other on both main surfaces of a light transmissive substrate 1 and an optical resonator 4 is formed between the reflecting surfaces 2 and 3. Then the lengths t0, t1, t2, t3,... of the resonator 4 are changed in accordance with recording information.
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公开(公告)号：JPH04311076A
公开(公告)日：1992-11-02
申请号：JP10397991
申请日：1991-04-09
Applicant: SONY CORP
Inventor： MASUDA HISASHI , KANEDA YUJI
Abstract: PURPOSE:To facilitate the control of the amount of double refraction in a nonlinear optical crystal element. CONSTITUTION:Pumping laser rays outputted from a laser diode 1 are made to concentrate on a laser medium 5 by a lens 2 through the intermediary of a 1/4 wavelength plate 4. By this setup, a heat lens 5a is formed in the laser medium 5, and laser rays of fundamental wave are generated. The laser rays of fundamental wave are reflected by planar mirrors 11 and 12, and thus a laser ray resonator 8 is constituted. The second harmonic laser rays of the fundamental laser rays of fundamental wave are outputted from a non-linear optical crystal element 6. A control plate 22 can be set freely movable in a direction vertical to the optical axis LA2 of pumping laser rays.
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公开(公告)号：JPH01152782A
公开(公告)日：1989-06-15
申请号：JP31335787
申请日：1987-12-10
Applicant: SONY CORP
Inventor： OKA MICHIO , MASUDA HISASHI
IPC: H01S3/109
Abstract: PURPOSE:To improve conversion efficiency for higher harmonic laser light by compensating phase change produced when basic wave laser light is passed through a non-linear optical crystal element by the use of a phase compensating element. CONSTITUTION:A phase compensating element 9 for compensating phase change produced in basic wave laser light LA(w) when the basic wave laser light LA(w) is passed through a non-linear optical crystal element 8 in a passage at which the basic wave laser light LA(w) is passed through the non-linear optical crystal element 8 is provided. Thus, the condition of a phase of each part of the basic wave laser light LA(w) in the inner part of a resonator CAV is stable. Therefore, a strong resonating condition can be formed in the inner part of the resonator CAV, and conversion efficiency of the basic wave laser light LA(w) produced in the non-linear optical crystal element 8 to second high er harmonic laser light LA(zw) can be heightened.
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