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公开(公告)号：JP2006066818A
公开(公告)日：2006-03-09
申请号：JP2004250532
申请日：2004-08-30
Inventor： OKA MICHIO
IPC: H01S3/0933 , G02F1/37 , H01S3/108
Abstract: PROBLEM TO BE SOLVED: To provide a one-dimensional illumination device which is effective for eliminating illumination unevenness due to interference and improving uniformity of an illumination light profile, and to provide an image forming device. SOLUTION: A one-dimensional transverse multi-mode laser is used for the one-dimensional illumination device 1. An optical source for excitation 2, and a laser medium 4 and an element for wavelength conversion 5 (non-linear optical crystal or non-linear optical element) in a resonator 3 are installed. Non-linear optical crystal or the non-linear optical element is irradiated with a linear beam obtained by exciting the laser medium 4 with an elliptic transverse mode pattern. A one-dimensional optical modulation element 7 is irradiated with linear light whose wavelength is converted, light modulated by the element is scanned and a two-dimensional image is formed. An M 2 value is set to be ≥7, the number of lateral modes is set to be ≥50, and a contrast is reduced to ≤ about 14% at the one-dimensional transverse multi-mode. One-dimensional illumination light is obtained (what is called top hat-shaped intensity distribution) with high uniformity. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract translation: 解决的问题：提供一种有效消除由于干扰引起的照明不均匀性和提高照明光轮廓的均匀性的一维照明装置，并提供图像形成装置。 解决方案：一维横向多模激光器用于一维照明装置1.激光光源2和激光介质4和用于波长转换的元件5（非线性光学晶体 或非线性光学元件）。 非线性光学晶体或非线性光学元件用以椭圆形横向模式激发激光介质4而获得的线性光束照射。 用线性光照射一维光调制元件7，线性光被波长转换，元件的光调制被扫描并形成二维图像。 将M
2 值设置为≥7，横向模式数设置为≥50，在一维横向多模式下将对比度降低至约14％。 获得高均匀度的一维照明光（所谓的顶帽形强度分布）。 版权所有（C）2006，JPO＆NCIPI -
公开(公告)号：JP2002280324A
公开(公告)日：2002-09-27
申请号：JP2001077041
申请日：2001-03-16
Applicant: SONY CORP
Inventor： KUBOTA SHIGEO , OKA MICHIO
IPC: G02F1/37 , B23K26/067 , G02B6/28 , H01L21/20 , H01L21/268 , H01L21/336 , H01L21/77 , H01L27/12 , H01L29/786 , H01S3/00 , H01S3/06 , H01S3/067 , H01S3/10 , H01S3/23
Abstract: PROBLEM TO BE SOLVED: To provide a laser of a smaller size and stable output pulse, as well as smaller and stable annealing device, etc. SOLUTION: There are provided a master laser 11, which emits a reference laser pulse beam RPref of wavelength 914 nm and pulse width 0.5 ns; microlens array 13 which splits the reference laser pulse beam RPref into N units of light; optical fiber amplifiers 14-1 to 14-N, whose lengths are sequentially set to have propagation delay time of 0.5 ns, which is the pulse widths of split reference laser pulse beam DRPref1 -DRPref N; a third higher harmonic generating device 17, which receives split reference laser pulse beam affected by amplification and delay to generate third higher harmonics TRD1-TRDN of wavelength 305 nm and pulse width 0.5 ns; and a lighting optical system 18 where N-pieces of third higher harmonics TRD1-TRDN are provided continuously in parallel for emission with the time being multiplexed.
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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：JPH1164904A
公开(公告)日：1999-03-05
申请号：JP22810797
申请日：1997-08-25
Applicant: SONY CORP
Inventor： KONDO KENJI , OKA MICHIO
IPC: G02F1/37
Abstract: PROBLEM TO BE SOLVED: To make it possible to generate a UV laser beam with high output for a long period of time by specifying the length along the optical path of a barium borate crystalline body and the beam waist of a laser beam passing the barium borate crystalline body to specific ranges. SOLUTION: The green laser beam from a laser oscillator 3 is made incident on the inside of a resonator 4 from the rear surface of a first curved mirror 8 and advances straightly. This laser beam passes the barium borate crystalline body 6 and is made incident on a second curve mirror 10. The laser beam made incident on a second flat mirror 14 is reflected, is reflected by a first flat mirror 12, is reflected by the first curved mirror 8 and is circulated in the resonator 4. At the time the laser beam passes the barium borate crystalline body 6, the UV laser beam which is the second harmonic wave of the original green laser beam is generated and is emitted from the resonator 4. At this time, the beam waist of the laser beam in the position of the barium borate crystalline body 6 is set within a range of 40 to 60 μm and the length of the barium borate crystalline body 6 along the optical path is set within a range of 2 to 6 mm.
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公开(公告)号：JPH08116122A
公开(公告)日：1996-05-07
申请号：JP25248094
申请日：1994-10-18
Applicant: SONY CORP
Inventor： KIKUCHI HIROKI , ASHIFU GOJIRU , OKA MICHIO
Abstract: PURPOSE: To obtain a continuous-wave ultraviolet laser apparatus which is small, which is operated stably, whose drive circuit is simplified and whose power consumption can be reduced. CONSTITUTION: A continuous-wave ultraviolet laser apparatus is provided with a laser light source part 1 which generates a visible-ray or near-infrared laser, with a wavelength conversion device 4 in which a wavelength conversion element 3 is arranged inside an optical resonator 2 and which wavelength-converts a laser beam from the laser light source 1 so as to take out a continuous-wave ultraviolet laser beam LUL, with a special locking circuit 5 which locks the optical resonator 2 to a prescribed resonator length and with an electro-optical phase modulator 6 which is used for its special locking operation. The electro- optical phase modulator 6 is constituted of an electro-optical crystal by KTP or its derivative.
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Patent Agency Ranking
公开(公告)号：JPH07140381A
公开(公告)日：1995-06-02
申请号：JP28960993
申请日：1993-11-18
Applicant: SONY CORP
Inventor： OKA MICHIO , EGUCHI NAOYA , SUGANUMA HIROSHI
Abstract: PURPOSE:To perfectly correct coma aberrations by arranging specific optical elements for compensation in the optical path of an optical system, moving these elements in a direction orthogonal with the optical axis to fluctuate their relative positions and to generate the coma aberrations reverse in positive and negative with respect to the coma aberrations of the optical system, thereby correcting the coma aberrations. CONSTITUTION:Two sheets of the optical elements 1, 2 for compensation are arranged in the optical path and are moved in directions opposite to each other in the direction orthogonal with the optical axis to generate the coma aberrations reverse in positive and negative with respect to the coma aberrations generated by the optical system, by which the coma aberrations are corrected. The shapes of two sheets of the optical elements for compensation have convex and concave aspherical faces 1b, 2b respectively given by + or -alphaR (R; the radius of the normalized pupil, 3a; quaternary aspherical face coefft.). Their respective incident faces 1a, 2a are formed as planes and the convex and concave aspherical faces 1b, 2b are formed as exit faces. The optimum moving quantity thereof is given by moving two pieces in the directions opposite to each other in proportion to the skew angle of the optical disk with respect to the generated coma aberrations.
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公开(公告)号：JPH07131101A
公开(公告)日：1995-05-19
申请号：JP27846993
申请日：1993-11-08
Applicant: SONY CORP
Inventor： BUIHIMAN BUERUNA , OKA MICHIO
Abstract: PURPOSE:To stably generate a second harmonic, using an Nd:YVO4 birefringence laser medium, by orienting the c-axis of the medium in the same direction as that of a crystal of a nonlinear optical crystal element. CONSTITUTION:A laser beam is emitted as a pumping beam from a laser diode 11, i.e., a semiconductor laser element as a pumping light source element. This beam is focused by a lens 12 and applied to a laser medium 16 made of Nd: YVO4 through a reflection mirror 14 of a laser resonator 13 and a quarter-wave plate 15. The mirror 14 uses a concave mirror having a concave face inside. The medium 16 generates a fundamental wave of the laser beam in response to the incidence of the excited beam, and this wave passing through a nonlinear optical crystal element 17 using e.g. KTP is reflected by a reflection mirror 18. The c-axis of the Nd:YVO4 of the medium 16 is oriented in the same direction as that of a KTP crystal of the element 17.
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公开(公告)号：JPH0676344A
公开(公告)日：1994-03-18
申请号：JP22754192
申请日：1992-08-26
Applicant: SONY CORP
Inventor： EGUCHI NAOYA , OKA MICHIO , MAEDA FUMISADA
Abstract: PURPOSE:To prevent the occurrence of a laser output fluctuation caused by interference noises and a degradation in signal characteristics by constituting a reciprocating folded optical path in the moving direction along the optical disk of an objective lens driving section of an optical pickup. CONSTITUTION:In an optical disk.pickup which has an objective lens driving section 1 and a light source section 2, the section 1 is constituted so that it is separated from an optical block 3 which has the section 2 and moves a direction X along the surface of an optical disk 4. An optical path 5, which keeps the distance between the section 2 and the optical disk 4 at a prescribed distance and is for folded reciprocation in the X direction, is formed in the optical path between the section 2 and an optical disk 46. Since the path 5 is formed in the X direction and an optical path 6, which is directed to the optical disk 4, is formed by a polarizing beam split PBS1, the distance between the section 2 and the optical disk 4 is kept constant by moving the section 6 together with the movement of the section 1.
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公开(公告)号：JPH0653593A
公开(公告)日：1994-02-25
申请号：JP20132892
申请日：1992-07-28
Applicant: SONY CORP
Inventor： EGUCHI NAOYA , OKA MICHIO
Abstract: PURPOSE:To make the servo pull-in control possible without malfunction by using an error signal for the length of a resonator and the signal for a reflected light for the servo pull-in control when a wavelength conversion is executed by automatically controlling the length of an external resonator or the resonator in the source of the laser beam. CONSTITUTION:In an apparatus for generating laser beam, the wavelength is converted by the resonant operation of an external resonator for the laser beam incident upon the nonlinear optical element 4 arranged for the external resonator 3 having at least a pair of reflecting means. In the reflecting means 1 which becomes the exit end of the laser bean whose wavelength is converted, means 5 is provided for shifting the reflecting means in the direction of the optical axis. The rays of the incident laser beam which are reflected at the external resonator 3 are reflected on the reflecting surface 14, thus detecting them by a photodetection element 12. In an synchronous detection circuit 13, an error signal is fetched from the resonator corresponding to the deviation of the length of the resonator with respect to the incident laser beam from the external resonator 3. Based upon this error signal, the shifting means 5 is controlled by a servo circuit 11 to servo the length of the resonator.
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公开(公告)号：JPH065962A
公开(公告)日：1994-01-14
申请号：JP18614792
申请日：1992-06-19
Applicant: SONY CORP
Inventor： OKA MICHIO
IPC: H01S3/109
Abstract: PURPOSE:To obtain a stable output and to efficiently oscillate by using type II as phase matching conditions of a nonlinear optical crystal element for generating a second harmonic wave in a resonator, and inserting a 1/4 wavelength plate of a fundamental wave into the resonator. CONSTITUTION:A 1/4 wavelength plate 14 has a reflecting surface 14R covered with high reflectivity coating for a fundamental wave laser light, and a transparent surface 14T covered with an antireflection coating for the fundamental wave laser light in such a manner that the surface 14R is parallel to the plate 14T. Thus, multiple reflections can be positively utilized in the plate 14. Accordingly, since an effective reflectivity of the multiple reflections is always '1', a decrease in an efficiency due to a loss in a resonator of a loss difference between polarization modes is eliminated, and a stable oscillation without spatial hole burning is obtained. An angle between optical axis of the oscillation and an optical axis of the 1/4 wavelength plate is set to 45 deg., and a folding direction of a folding mirror in resonance is provided in a plane including the optical axis of the oscillation, thereby suppressing an increase in a diameter of the fundamental laser in the resonator.
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