公开(公告)号：JPH06224504A

公开(公告)日：1994-08-12

申请号：JP1129293

申请日：1993-01-27

Applicant: SONY CORP

Inventor： OKA MICHIO

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

Abstract: PURPOSE:To improve the sum frequency conversion efficiency and realize its stabilization by setting the incident light axis of a first and second fundamental wave laser lights against the mirror surfaces of first and second reflecting mirrors to be directed in an ablique direction. CONSTITUTION:A resonator is provided with a first and second reflecting mirrors M1 and M2 that are arranged facing each other on the light input/output end faces that face each other in at least a nonlinear optical element 3. The mirrors M1 and M2 have an infinitely high transmittance against a second fundamental wave laser light and a sum frequency light and show an infinitely high reflectance against a first fundamental wave laser light. The incident light axis of the first and second fundamental wave laser lights against the mirror surfaces of the mirrors M1 and M2 is set to be directed in an oblique direction where a specific angle is held so that the axis may be aligned with the perpendicular of the mirror surfaces. In addition, the resonator 7 consists of first to fourth reflecting mirrors M1-M4, and their light routes is made of reflected construction. Thus, the reflected light through residual reflection can be improved.

公开(公告)号：JPH05243661A

公开(公告)日：1993-09-21

申请号：JP7875392

申请日：1992-03-02

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  OKA MICHIO

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

Abstract: PURPOSE:To extend a servo band to several tens kHz, to stably control and to efficiently wavelength-convert by using an electromagnetic actuator as means for moving at least one of a pair of reflecting means in an optical axis direction. CONSTITUTION:A basic wave laser light is phase-modulated by a phase modulator 12, and introduced to an external resonator 15 through a reflecting surface 13 for detecting a resonator reflected light and a lens 14 for condensing. At least one such as a reflecting surface 17 of a pair of reflecting surfaces 16, 17 of the resonator 15 is driven in an optical axis direction by an electromagnetic actuator 19. As the actuator 19, a voice coil drive type actuator may be used, a plurality of resonance frequencies can be incorporated in several tens kHz-100kHz or higher, and a servo band can be extended, for example, to 20kHz-several tens kHz by increasing a resonance frequency of a servo loop and reducing a phase breakaway.

公开(公告)号：JPH057035A

公开(公告)日：1993-01-14

申请号：JP18291491

申请日：1991-06-27

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/0915 ,  H01S3/06

Abstract: PURPOSE:To effectively generate high power laser beam without enlarging an apparatus, by installing laser medium which generates laser beam in a light emission pattern of a higher order transversal mode, and a plurality of pumping means giving pumping energy. CONSTITUTION:An equipment generating laser beam for pumping which equipment is constuted of, e.g. a laser diode is accommodated in an excitation light source 1. A fiber array 2 is constituted of a plurality of optical fibers 2a-2c. A concave mirror 4 is constituted so as to transmit the greater part of laser light for pumping and reflect the greater part of fundamental wave laser light generated by laser medium 5. A concave mirror 6 transmits laser beam generated by laser medium in the several percent to several ten's percent range and reflects the residual part. When a plurality of optical fibers are arranged so as to correspond with a plurality of light emission patterns, higher output laser light can be generated without increasing the size of a resonator 7.

公开(公告)号：JPH03256383A

公开(公告)日：1991-11-15

申请号：JP5441990

申请日：1990-03-06

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/094 ,  H01S3/10 ,  H01S3/108

Abstract: PURPOSE:To easily realize a small size and to obtain a laser beam source whose output is large by a method wherein an optical resonator equipped with a nonlinear optical element is provided and an optical separation means which separates a first laser beam from a second laser beam spatially is installed. CONSTITUTION:A laser beam from a laser diode 1a is condensed by an objective (convex lens) 2a; it is incident on a laser rod 4a. A p-polarized fundamental-wave laser beam is generated; it is passed through a polarization beam splitter 5 and is incident on a nonlinear optical crystal element 6. A second harmonic beam is generated and reflected by a concave mirror. This operation is repeated; a p-polarized second harmonic beam having a prescribed optical output is obtained; one part is output from a concave mirror 3c. Regarding a laser beam from a laser diode 16, an s-polarized fundamental-wave laser beam is reflected by the polarization beam splitter 5; an s-polarized second harmonic wave beam having a prescribed optical output is obtained; one part becomes an output beam.

公开(公告)号：JPH03155518A

公开(公告)日：1991-07-03

申请号：JP19115290

申请日：1990-07-19

Applicant: SONY CORP

Inventor： KANEDA YUJI ,  OKA MICHIO

IPC: G02B27/09 ,  G02B27/00 ,  G02B27/10 ,  H01S3/06 ,  H01S3/101

Abstract: PURPOSE:To obtain synthetic light with high power density with a small spot diameter by making an optical beam incident on an optical fiber via an optical system after synthesizing with a polarizing beam splitter. CONSTITUTION:The laser beam source is equipped with first and second light sources 22A, 22B which emit first and second optical beams LA, LB having prescribed polarizing planes, an arranging means 28A which arranges the beam shape of the first optical beam LA, and an arranging means 28B which arranges the beam shape of the second optical beam LB. Also, it is equipped with the polarizing beam splitter 32 which receives the first optical beam LA outputted from the first beam arranging means 28A and also, receives the second beam LB outputted from the second beam shape arranging means 28B at a state where its polarizing plane is inclined by 90 deg. against the first optical beam LA, and synthesizes the beams LA and LB. Furthermore, it is equipped with convergence optical systems 34, 35, and 36 which converge the synthetic light LL outputted from the polarizing beam splitter 32 and introduce it to the optical fibers 40A-40N. Thereby, it is possible to obtain a laser beam with high power density with the small spot diameter.

公开(公告)号：JPH01220877A

公开(公告)日：1989-09-04

申请号：JP4659188

申请日：1988-02-29

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/08 ,  H01S3/06 ,  H01S3/094 ,  H01S3/0941

Abstract: PURPOSE:To halve the length of laser medium by a method wherein the exciting laser beams advancing in a laser medium is reflected at one end of the laser medium to form an effective absorption region while the exciting laser beams are reciprocating in the laser medium. CONSTITUTION:Within a laser beam source 11 wherein exciting laser beams LA 11 are absorbed to emit basic wave laser beams LA 12 while the exciting laser beams LA 11 are advancing from one end 15A to the other end 15B in the laser medium 15, an effective absorption region is formed in the optical path wherein the exciting laser beams LA 11 reciprocate in the laser medium 15 by making the exciting laser beams LA 11 advancing in the laser medium 15 reflect to the other end 15B of the laser medium 15. Through these procedures, the exciting laser beams LA 11 can be prevented from mixing with the output laser beams LAOUT emitted through an output mirror 16 as stray light to halve the length of laser medium 15.

公开(公告)号：JPH01166581A

公开(公告)日：1989-06-30

申请号：JP32567187

申请日：1987-12-22

Applicant: SONY CORP

Inventor： OKA MICHIO ,  MASUDA HISASHI

IPC: H01S3/094 ,  H01S3/0941

Abstract: PURPOSE:To acquire a laser beam source which can excite a solid laser efficiently, by integrating energy of light component after an imaging point based on the laser beam component which is obtained from an effective intersection arranged in a horizontal cross direction of a semiconductor laser and by using it as an excitation source for a laser medium. CONSTITUTION:A laser beam LA1 emitted from a semiconductor laser 1 of a laser source 1 is changed to a parallel laser beam LA11 by a collimator 3 and lead to a vertical crosswise cylindrical lens 12. A laser beam LA12 which is obtained by converging laser beam LA11 in a vertical crosswise direction with the lens 12 is projected to a horizontal crosswise cylindrical lens 13. The laser beam LA12 is converged in a horizontal cross direction with the lens 13, and a laser beam LA13 acquired thereby is irradiated as an excitation laser beam to a laser medium 5 of a solid laser. A laser beam LA2 emitted from the laser medium 5 is projected through an output reflection mirror 6, thus exciting a solid laser efficiently.

公开(公告)号：JPS63271783A

公开(公告)日：1988-11-09

申请号：JP10576787

申请日：1987-04-29

Applicant: SONY CORP

Inventor： MASUDA HISASHI ,  OKA MICHIO ,  NAITO MINE ,  TOSAKA SUSUMU

IPC: G11B23/03 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To satisfactorily record signals by providing an auxiliary magnetic field generating member in the main body of a hermetic disk cartridge so that a sufficient magnetic field is supplied to a recording medium of a magneto- optical disk. CONSTITUTION:A cartridge main body 2 has a hermetic structure to store a disk 3 hermetically to the outside air and secures the complete air tightness inside. A fixed magnet 22 is fixed as an auxiliary magnetic field generating member opposite to an objective lens 12 of a pickup 10 centering on the disk 3. In such constitution where the magnet 22 is added into the main body 2, a sufficient auxiliary magnetic field is supplied to the disk 3 stored in the main body 2. Thus the signals are satisfactorily recorded.

公开(公告)号：JPS6124033A

公开(公告)日：1986-02-01

申请号：JP14576884

申请日：1984-07-13

Applicant: Sony Corp

Inventor： FUKUMOTO ATSUSHI ,  OSATO KIYOSHI ,  OKA MICHIO

IPC: G11B7/09 ,  G11B7/095 ,  G11B7/135

CPC classification number: G11B7/0956 ,  G11B7/0903 ,  G11B7/1353 ,  G11B7/1381

Abstract: PURPOSE: To obtain a tracking error signal of a zero-order beam unchanged by a change in a tangential skew angle to a recording medium by providing a light shield for a reflected beam of a recording medium to both side beams between a semiconductor laser element and a diffractive grating.
CONSTITUTION: The light shield 11 passing a center beam La and shutting both side beams Lb, Lc, in the reflected beam passing through a diffractive grating 3 toward a semiconductor laser element 1 from a recording medium 6 is provided between two pairs of positive lenses 9, 10 and 9, 10 between a collimator lens 2 and the diffractive grating 3. That is, the light absorbing property or the light irregular reflecting property are given to a face of the light shield plate 11 toward the diffractive grating 3 so that the center beam La passes through the center hole 11a and both the side beams Lb, Lc are shut by the light shield plate. Thus, a tracking error signal of the zero-order beam of a head OH unchanged by a change in a tangential skew angle to the recording medium is obtained.
COPYRIGHT: (C)1986,JPO&Japio

Abstract translation: 目的：通过为记录介质的反射光束提供一个用于记录介质的反射光束的光屏蔽，在半导体激光元件与半导体激光器元件之间的两侧光束上，通过与记录介质的切向偏斜角度的变化来获得零级光束的跟踪误差信号， 衍射光栅。 构成：在两对正透镜9之间设置有通过中心光束La并且将通过衍射光栅3的反射光束中的两侧光束Lb，Lc从记录介质6朝向半导体激光元件1关闭的遮光罩11 在准直透镜2和衍射光栅3之间具有10和9,10。也就是说，将光吸收特性或光不规则反射特性赋予遮光​​板11的朝向衍射光栅3的面，使得中心 光束La穿过中心孔11a，并且两个侧光束Lb，Lc被遮光板关闭。 因此，通过与记录介质的切线偏斜角度的变化，头部OH的零级波束的跟踪误差信号被获得。

公开(公告)号：JPS6124032A

公开(公告)日：1986-02-01

申请号：JP14576784

申请日：1984-07-13

Applicant: Sony Corp

Inventor： FUKUMOTO ATSUSHI ,  OSATO KIYOSHI ,  OKA MICHIO

IPC: G11B7/09 ,  G11B7/135

Abstract: PURPOSE:To obtain a tracking error signal of a zero-order beam unchanged by a change in a tangential skew angle to a recording medium by specifying an optical path difference between a center beam and both side beams of a reflected beam of a recording medium. CONSTITUTION:When a straight line connecting the center beam La and the side beams Lb, Lc toward a semicondutor laser beam is nearly orthogonal to an active layer 1a of thd semiconductor laser element 1, the optical path length between the Lb of both the side beams Lb, Lc and the center beam La is selected to lambda/4,(2n+1), where n=0, 1, 2, 3,.... Then the light intensity 1A at a point A is expressed as 1A=const, no interference takes place between the center beam La and one beam Lb of both the side beams and the level of the tracking error signal is unchanged in the conversion of the tangential skew angle. Further, since the beam Lc is reflected irregularly at a heat sink 8, there is no possibility of interference with the center beam La.

Abstract translation: 目的：通过指定记录介质的反射光束的中心光束和两侧光束之间的光程差，通过与记录介质的切线偏斜角度的变化来获得零级光束的跟踪误差信号。 构成：当将中心光束La和侧光束Lb，Lc连接到半导体激光束的直线几乎与半导体激光元件1的有源层1a正交时，两个侧光束的Lb之间的光路长度 Lb，Lc和中心光束La被选择为λ/ 4，（2n + 1），其中n = 0,1,2,3 ...，然后点A处的光强度1A表示为1A = const，在两束侧光束的中心光束La和一个光束Lb之间不发生干涉，并且跟踪误差信号的电平在切向偏斜角的转换中不变。 此外，由于光束Lc不规则地反射在散热器8处，所以不可能干涉中心光束La。