公开(公告)号：JPH04243177A

公开(公告)日：1992-08-31

申请号：JP1706891

申请日：1991-01-17

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: G02B27/28 ,  G02F1/37 ,  H01S3/08 ,  H01S3/109

Abstract: PURPOSE:To sufficiently suppress a spatial hole burning effect even if a laser medium 5 to a resonator 8 is long. CONSTITUTION:Circularly polarized fundamental wave laser light emitted from a laser medium 5 is linearly polarized upon passing through a 1/4 wavelength plate 4. The linearly polarized fundamental wave laser light reflected by a concave mirror 3 is again returned to the circularly polarized light upon passing through the plate 4. The light passed through the medium 5 is linearly polarized upon passing through a nonlinear optical crystal element 6 set at 90 deg. of a double refraction amount. The linearly polarized light reflected by a concave mirror 7 is returned to the circularly polarized light upon passing through the element 6. Thus, the light which traveling to and fro in the medium 5 is circularly polarized.

公开(公告)号：JPH0476974A

公开(公告)日：1992-03-11

申请号：JP19115090

申请日：1990-07-19

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/094

Abstract: PURPOSE:To reduce an output change due to a mode hopping noise at a semiconductor-laser light source by installing a means which amplitude- modulates driving electric waves for the semiconductor-laser light source by means of a frequency whose speed is higher than that of the response speed of a laser medium. CONSTITUTION:A DC voltage form a DC voltage source 1 is supplied to a modulator 3. An oscillator 2 supplies the modulator 3 with an oscillation signal at a frequency whose speed is higher than the response speed of a laser medium 9; the Dc voltage form the voltage source 1 is amplitude-modulated. The voltage is supplied to a voltage-to-current converter 4 and is converted into an electric current to be amplitude-modulated; the converted current is supplied to a semiconductor-laser light source 5 as a driving current. Thereby, a mode hopping operation by the semiconductor-laser light source 5 is averaged, and it is possible to avoid an output change due to a mode hopping noise of the semiconductor- laser light source 5.

公开(公告)号：JPH03233986A

公开(公告)日：1991-10-17

申请号：JP2927590

申请日：1990-02-08

Applicant: SONY CORP

Inventor： KUBOTA SHIGEO ,  OKA MICHIO ,  KANEDA YUJI

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

Abstract: PURPOSE:To obtain a laser light of a large output by forming at least one of both end faces of a laser rod in a spherical surface having a curvature capable of correcting a step based on heat generated by a pumping light. CONSTITUTION:At least one end face of a laser rod 5 is formed in a spherical surface having a curvature capable of correcting a thermal aberration due to a pumping light. Thus, the end face of the rod 5 at a convex lens 2 side is formed, for example, in a convex spherical surface having a radius R1 of curvature, the end face at an optical element 6 side is formed in a concave spherical surface having a radius R2 of curvature, and the entire shape of the rod 5 is formed in a meniscus lens state near a concentrical shape. Thus, a thermal lens effect is eliminated in a uniform temperature distribution state to obtain a laser light of a large output.

公开(公告)号：JPH03157843A

公开(公告)日：1991-07-05

申请号：JP29861589

申请日：1989-11-16

Applicant: SONY CORP

Inventor： FUKUMOTO ATSUSHI ,  OKA MICHIO

IPC: G11B11/10 ,  G11B7/005 ,  G11B7/135 ,  G11B11/105

Abstract: PURPOSE:To read out information with a high resolution by partially overlapping two beam spots different in polarization state to irradiate a recording medium with them and making the read range smaller than the size of one beam spot. CONSTITUTION:A light dividing element 5 which divides a light beam to two light beams which are set to linear polarization states to have polarization directions orthogonal to each other and are different in an advance direction and a phase converting element 6 which converts phases of oscillation components in two axes orthogonal to each other in a plane orthogonal to the advance direction of the incident beam are provided. Two beam spots different in polarization state are partially overlapped and are irradiated to a recording medium 2. Consequently, the recording medium 2 is irradiated with light beams in three kinds of polarization state, and the area irradiated with the light beam related to read of an information signal out of these light beams is smaller than one beam spot. Thus, the information signal recorded with a high recording density is read out without increasing the numerical aperture of an objective lens neither shortening the wavelength of light beams.

公开(公告)号：JPH01319139A

公开(公告)日：1989-12-25

申请号：JP15249588

申请日：1988-06-20

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/135 ,  G11B7/14

Abstract: PURPOSE:To reproduce information, which are recorded with high density, without fail by executing the tracking control of an optical head from a servo area through the servo signal of a sample format, forming one spot to the plural bits of a data area and simultaneously reading the plural information. CONSTITUTION:The tracking control is executed to the optical head based on the servo signal of the sample format, which is obtained from a servo area ARS of an optical disk 12, and one optical spot SP is formed to plural bits PA and PB which are formed in a data area ARD. A returning optical beam LA1 of an optical beam is guided to a light receiving part 14 and the plural bits of information are simultaneously read from the data area ARD based on a sum signal S and a difference signal S to plural output signals SA and BB which are outputted from the light receiving part 14. Thus, even when the information is recorded with the high density in the data area ARD, the plural bits of information can be read without fail.

公开(公告)号：JPH01220879A

公开(公告)日：1989-09-04

申请号：JP4659488

申请日：1988-02-29

Applicant: SONY CORP

Inventor： OKA MICHIO

IPC: H01S3/06 ,  H01S3/109

Abstract: PURPOSE:To stabilize a fundamental wave laser beam by a method wherein the funda mental wave laser beam consists of the modes of two intrinsic polarizations intersecting orthogonally each other and moreover, with the fundamental wave laser beam made to perform a resonance operation in a random polarization state having no correlation in the phase relation between the two modes, the transfer of an energy is prevented from generating through the generation of a second higher harmonics between the two intrinsic polarizations. CONSTITUTION:A fundamental wave laser beam LA(w) generated in a laser medium 2 is made to perform a resonance operation in such a way as to pass through a nonlinear optical crystal element 6 provided in the interior of a resonator CAV, where by by inserting a birefringent element 7 in a resonance optical path 9 to reciprocate the resonator while the plane of polarization of the laser beam LA(w) is rotated in a laser beam source to generate a second higher harmonics laser beam LA(2w), two intrinsic polarizations intersecting orthogonally each other are set as the mode of a fundamental wave and furthermore, the magnetic declination theta and the phase amount DELTAof the element 7 are each selected at such a value that the transfer of an energy is not generated through the generation of a second higher harmonics between the two intrinsic polarizations of the laser beam LA(w). Thereby, the fundamental wave laser beam dan stably form resonance operation in the interior of the resonator.

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.

公开(公告)号：JP2009092712A

公开(公告)日：2009-04-30

申请号：JP2007260281

申请日：2007-10-03

Applicant: Sony Corp ,  ソニー株式会社

Inventor： OKAMOTO TSUTOMU ,  OKA MICHIO

IPC: G02F1/377 ,  C30B29/30 ,  C30B33/02

Abstract: PROBLEM TO BE SOLVED: To fully secure the optical damage resisting strength of a single crystal, restraining increase in the coercive electric field, and holding down variations in the characteristics, when forming a cyclic polarization reverse structure.
SOLUTION: A lithium tantalate single-crystal substrate of congruent composition, which contains magnesium oxide as an additive, the addition amount being set in a range of 0 mol% to 0.15 mol%, is used, and the lithium tantalate single crystal substrate of congruent composition is treated with raw material, at least containing lithium according to a vapor-phase balance method to approach a stoichiometric composition. The substrate 1 is used to form the optically functional element.
COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：当形成循环极化反转结构时，为了充分确保单晶的光学损伤抗性强度，抑制矫顽电场的增加和抑制特性的变化。 解决方案：使用含有氧化镁作为添加剂的一体组成的钽酸锂单晶衬底，添加量设定在0mol％至0.15mol％的范围内，并且钽酸锂单晶 用原料处理一次性组成的底物，根据气相平衡法至少含有锂以接近化学计量组成。 基板1用于形成光学功能元件。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2008060261A

公开(公告)日：2008-03-13

申请号：JP2006234082

申请日：2006-08-30

Applicant: Sony Corp ,  ソニー株式会社

Inventor： TAKAHASHI KOJI ,  OKA MICHIO ,  IWASE NOBUTAKE

IPC: H01S3/108 ,  H01S3/094

Abstract: PROBLEM TO BE SOLVED: To suppress a shift in the optical axis of light emitted from a laser device caused by a change in an environmental temperature. SOLUTION: A laser device having a semiconductor laser includes a stationary fixing mount 51 as a mount of fixing the laser device to an external mounting support, and semi-stationary fixing mounts 52 and 53 contacted movably within the mounting surface of the support. When the stationary fixing mount 51 is located at a position close to the light exit end of the laser device, a mechanical strain is suppressed from being generated, because the laser device is slid to the external support without causing a shift in its optical axis. COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 解决的问题：抑制由环境温度的变化引起的激光装置发出的光的偏移。 解决方案：具有半导体激光器的激光装置包括作为将激光装置固定到外部安装支架的安装件的固定固定支架51和可移动地接合在支撑件的安装表面内的半固定固定支架52和53 。 当固定固定安装件51位于靠近激光装置的光出射端的位置时，由于激光装置滑动到外部支撑件而不引起其光轴移动，所以抑制了机械应变的产生。 版权所有（C）2008，JPO＆INPIT

公开(公告)号：JP2006066817A

公开(公告)日：2006-03-09

申请号：JP2004250531

申请日：2004-08-30

Applicant: Sony Corp ,  ソニー株式会社

Inventor： OKA MICHIO

IPC: H01S3/109 ,  G02F1/37 ,  H01S3/042

Abstract: PROBLEM TO BE SOLVED: To sufficiently suppress parasitic oscillation which occurs near a wavelength of a fundamental wave, and to improve output and stability in a light source device where a non-linear optical element having a periodic polarization inversion structure is installed in a solid-state laser resonator which oscillates at a vertical/horizontal multi-mode and in an image forming device. SOLUTION: In the light source device 1, the non-linear optical element 5 having the periodic polarization inversion structure is disposed in the solid-state laser resonator 3 which oscillates at the vertical/horizontal multi-mode. When a higher harmonic by phase matching is generated, oscillation wavelength width of the fundamental wave by a laser medium 4 in the resonator 3 becomes phase matching width or below of the non-linear optical element 5. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：为了充分抑制在基波的波长附近发生的寄生振荡，并且为了提高其中安装有具有周期性极化反转结构的非线性光学元件的光源装置的输出和稳定性， 在垂直/水平多模式下和在图像形成装置中振荡的固态激光谐振器。 解决方案：在光源装置1中，具有周期性极化反转结构的非线性光学元件5设置在以垂直/水平多模振荡的固态激光谐振器3中。 当产生通过相位匹配的高次谐波时，谐振器3中的激光介质4的基波的振荡波长宽度成为非线性光学元件5的相位匹配宽度或以下。（C）2006 ，JPO＆NCIPI