公开(公告)号：US4766585A

公开(公告)日：1988-08-23

申请号：US844178

申请日：1986-03-12

申请人： Atsushi Fukumoto ,  Kiyoshi Ohsato ,  Michio Oka

发明人： Atsushi Fukumoto ,  Kiyoshi Ohsato ,  Michio Oka

IPC分类号： G11B7/09 ,  G11B7/095 ,  G11B7/135 ,  G11B7/125

CPC分类号： G11B7/0956 ,  G11B7/0903 ,  G11B7/1353 ,  G11B7/1381

摘要： The present invention is, in an optical head tracking error detecting apparatus in which a laser beam from a semiconductor laser element (1) is introduced into a diffraction grating (3), a 0-order beam and .+-.1st-order beams emitted from the diffraction grating (3) are introduced through a beam splitter (4) to an objective lens (5), a 0-order beam and .+-.1st-order beams of converged beams which are introduced into an optical recording medium (6) and reflected on the optical recording medium (6) are passed through the objective lens (5), reflected on the reflection surface of the beam splitter (4), and then introduced into a photodetector (7), a pair of photo-detection outputs corresponding to said .+-.1st order beams are obtained from the photodetector (7) and on the basis of the difference between the pair of photo-detection outputs, there is generated a tracking error signal corresponding to the tracking state of the 0-order beam on the optical recording medium (6), to provide a pair of positive lenses (9) and (10) between the semiconductor laser element (1) and the diffraction grating (3) and a light shielding member (11) between the pair of positive lenses (9) and (10) to pass therethrough a central beam of the central beam and both side beams which are reflected on the optical recording medium (6), passed through the objective lens (5), the beam splitter (4) and the diffration grating (3) and directed to the semiconductor laser element (1) but to shield the both side beams, whereby to generate a tracking error signal which is not changed by the change of a tangential skew angle of the 0-order beam of an optical head OH relative to the optical recording medium (6).

公开(公告)号：US20050002626A1

公开(公告)日：2005-01-06

申请号：US10834981

申请日：2004-04-30

申请人： Makoto Watanabe ,  Atsushi Fukumoto ,  Michio Oka

发明人： Makoto Watanabe ,  Atsushi Fukumoto ,  Michio Oka

IPC分类号： G02B26/08 ,  G02B6/00 ,  G02B6/02 ,  G02B6/38 ,  G02B27/18 ,  G02B6/20

CPC分类号： G02B6/02347 ,  G02B6/02338 ,  G02B6/3855

摘要： A photonic crystal fiber has a configuration in which a multiplicity of voids are arranged along the longitudinal direction of the fiber and with a regular sectional structure, a terminal end portion of the fiber is fusion bond sealed with a fusing material composed of a glass lower than a light propagation medium of the fiber in softening temperature, and the terminal end portion is connected to a ferrule with the fusing material. With this configuration, it is possible to obviate the lowerings in optical characteristics such as a large refractive index difference between the light propagation medium and the voids, a high light transmission efficiency, a high numerical aperture, etc., and to obviate such problems as the penetration of foreign matter into the inside of the voids, a burning failure arising from a positional staggering of the ferrule, etc.

摘要翻译： 光子晶体光纤具有沿着纤维的长度方向配置多个空隙的构造，并且具有规则的截面结构，纤维的末端部分用由低于 软化温度下的纤维的光传播介质，并且末端部利用熔融材料与套圈连接。 通过这种结构，能够消除光传播介质和空隙之间的大的折射率差，高透光效率，高数值孔径等的光学特性的下降，并且消除诸如 异物渗透到空隙的内部，由于套圈的位置交错引起的燃烧故障等

公开(公告)号：US5394381A

公开(公告)日：1995-02-28

申请号：US259934

申请日：1994-06-13

申请人： Atsushi Fukumoto ,  Michio Oka

发明人： Atsushi Fukumoto ,  Michio Oka

IPC分类号： G11B11/10 ,  G11B7/005 ,  G11B7/135 ,  G11B11/105 ,  G11B13/04

CPC分类号： G11B7/1365 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/10576 ,  G11B7/005 ,  G11B7/1356 ,  G11B7/1395

摘要： An optical pickup apparatus of the present invention for reading out information signals recorded on an optical recording medium such as magneto-optical disc is adapted to split by means of a light splitting element a light beam emitted from a light source into two light beam travelling in different directions, which are linearly polarized in normally intersecting directions and to convert the phases of the vibrational components along normally intersecting two axes on a plane normally intersecting the traveling directions of the two light beams and to irradiate the recording medium with two light beams which are differently polarized so that two beam spots are partially superimposed with each other on the recording medium. The superimposed beam spot area which is a read out area is made smaller than one of the beam spots in size so that a high resolution read-out is performed.

摘要翻译： 用于读出记录在诸如磁光盘的光学记录介质上的信息信号的本发明的光学拾取装置适于通过分光元件将从光源发射的光束分成两束光束 不同的方向，它们在正交相交方向上线性偏振，并且通过正交相交的两个轴将振动分量的相位转换成通常与两个光束的行进方向相交的平面，并用两个光束照射记录介质 不同的极化，使得两个光束点在记录介质上彼此部分地叠加。 作为读出区域的叠加光束斑区域的尺寸小于一个光束点，从而执行高分辨率读出。

公开(公告)号：US20080180934A1

公开(公告)日：2008-07-31

申请号：US12015283

申请日：2008-01-16

申请人： Michio Oka ,  Shinichiro Tajiri

发明人： Michio Oka ,  Shinichiro Tajiri

IPC分类号： F21V13/02

CPC分类号： G02B19/0057 ,  G02B19/0014 ,  G02B27/0927 ,  G02B27/0966 ,  G02B27/285 ,  H01S3/005 ,  H01S5/005 ,  H01S5/4012 ,  H01S5/4025 ,  H01S5/4031

摘要： A laser light source unit is provided, including a light source, a wavefront dividing unit, a wavefront synthesizing unit, and a polarization conversion unit. The wavefront dividing unit includes at least a plurality of dividing regions which are capable of dividing a first wavefront of light emitted from the light source to form a plurality of light beams. The wavefront synthesizing unit is configured to synthesize the first wavefront of light divided by the wavefront dividing unit to form a second wavefront and lead the second wavefront to a subject to be illuminated, and the polarization conversion unit is configured to rotate the plane of polarization of a portion of the plurality of light beams. In addition, the polarization conversion unit is provided with at least a plurality of wave plates each having the direction of optical axis different each other.

摘要翻译： 提供一种激光光源单元，包括光源，波前分割单元，波阵面合成单元和偏振转换单元。 波前分割单元包括至少多个分割区域，其能够划分从光源发射的光的第一波前，以形成多个光束。 波阵面合成单元被配置为合成由波前分割单元分割的光的第一波前，以形成第二波前，并将第二波前引导到被照明的对象，并且偏振转换单元被配置为使偏振平面的 多个光束的一部分。 此外，偏振转换单元设置有至少多个具有光轴方向彼此不同的波片。

公开(公告)号：US06404786B1

公开(公告)日：2002-06-11

申请号：US09543136

申请日：2000-04-05

申请人： Kenji Kondo ,  Michio Oka ,  Hiroyuki Wada

发明人： Kenji Kondo ,  Michio Oka ,  Hiroyuki Wada

IPC分类号： H01S310

CPC分类号： G02F1/3501 ,  G02F2001/3505

摘要： A laser beam in the ultraviolet region is generated at high power for along period. A green laser beam generated by a laser oscillator comes incident into a resonator from behind a first curved mirror, and circulates there, reflected by each mirror. By passing a barium borate crystal, it causes a secondary harmonic (a laser beam in the ultraviolet region) to be generated, which is taken out of the resonator via a second curved mirror. The beam waist of the laser beam passing the barium borate crystal is set to 46 &mgr;m, about double the conventional thickness, by adjusting the distance between the first curved mirror and a second flat mirror. As a result, the power density of the laser beam in the barium borate crystal is reduced to ¼ of the value according to the related art, and it is made possible to avoid rapid degradation of the barium borate crystal by excessive squeezing of the laser beam.

摘要翻译： 紫外线区域的激光束在高功率下产生一段时间。 由激光振荡器产生的绿色激光束从第一曲面镜的后面入射到谐振器中，并在那里循环，由每个反射镜反射。 通过使硼酸钡晶体通过，产生二次谐波（紫外区域中的激光束），其通过第二曲面镜从谐振器中取出。 通过硼酸钡晶体的激光束的束腰通过调整第一曲面镜和第二平面镜之间的距离而设定为46μm，约为传统厚度的两倍。 结果，根据现有技术，硼酸钡晶体中的激光束的功率密度降低到1/4的值，并且可以避免过度挤压激光束导致硼酸钡晶体的快速降解 。

公开(公告)号：US06403966B1

公开(公告)日：2002-06-11

申请号：US09339851

申请日：1999-06-25

申请人： Michio Oka

发明人： Michio Oka

IPC分类号： G01J142

CPC分类号： G02B21/16

摘要： A measurement method and a measurement apparatus for measuring the structure of a micro-structure or the structure along the depth of an object for measurement. The laser light from a solid-state laser light source is subjected to wavelength conversion to generate the ultraviolet laser light, and measurement is made of the object for measurement by heterodyne detection or homodyne detection employing the ultraviolet laser light. This enables measurement of a structure of a micro-structure. Alternatively, the laser light is split into multiple laser light beams and frequency shifted so that the laser light beams will be of different frequencies. The laser light beams are imaged at respective different focal point positions to perform heterodyne detection. The resulting heterodyne signals are separated into respective frequency bands and measurement is made of the structure of the object for measurement in association with the respective imaging points. This enables measurement of the structure of the object for measurement in the direction along its depth.

摘要翻译： 一种测量方法和测量装置，用于测量沿着测量对象的深度的微结构或结构的结构。 对来自固态激光光源的激光进行波长转换以产生紫外激光，并且通过使用紫外激光的外差检测或零差检测来测量测量对象。 这使得能够测量微结构的结构。 或者，激光被分成多个激光束并且频移，使得激光束将具有不同的频率。 激光束在各个不同的焦点位置成像，以进行外差检测。 所得到的外差信号被分离成相应的频带，并且与各个成像点相关联地测量用于测量的对象的结构。 这使得能够沿着其深度的方向测量被测物体的结构。

公开(公告)号：US06181461B2

公开(公告)日：2001-01-30

申请号：US09162105

申请日：1998-09-28

申请人： Hiroyuki Wada ,  Hisashi Masuda ,  Kenji Kondo ,  Michio Oka ,  Yuushi Kaneda

发明人： Hiroyuki Wada ,  Hisashi Masuda ,  Kenji Kondo ,  Michio Oka ,  Yuushi Kaneda

IPC分类号： G02F135

CPC分类号： G02F1/37 ,  G02F2001/3542

摘要： In an optical system having at least one optical part other than mirrors, for example, a wavelength conversion optical system which uses an external resonator, an optical system which is capable of solving the problem of transverse mode generation due to the existence of scattering matter and the optical crystal used and capable of supplying a stable output (stable wavelength conversion output) is provided. At least at one point in a stable resonator having optical parts (optical crystal) other than mirrors, an aperture having a circular hole with a diameter 1 to 10 times the diameter of a beam at the aperture, a slit having a width 1 to 10 times the diameter of the beam, or an aperture of an arbitrary shape having an edge is located, or a knife edge having an linear or curved edge is Located so that the nearest distance between the edge and the beam is 1 to 10 times the radius of the beam from the center of the beam.

摘要翻译： 在具有除反射镜之外的至少一个光学部件的光学系统中，例如，使用外部谐振器的波长转换光学系统，能够解决由于散射物质的存在而产生横向模式的问题的光学系统，以及 提供了使用并且能够提供稳定输出（稳定的波长转换输出）的光学晶体。 至少在具有除了镜子之外的光学部件（光学晶体）的稳定谐振器中的一个点处，具有直径在光阑的光束直径的1至10倍的圆形孔的孔，具有宽度1至10的狭缝 或者具有边缘的任意形状的孔的位置，或者具有线性或弯曲边缘的刀刃被定位成使得边缘和梁之间的最近距离为半径的1至10倍 的梁的中心。

公开(公告)号：US5930283A

公开(公告)日：1999-07-27

申请号：US869478

申请日：1997-06-05

申请人： Yutaka Imai ,  Michio Oka

发明人： Yutaka Imai ,  Michio Oka

IPC分类号： H01S3/083 ,  H01S3/0941 ,  H01S3/16 ,  H01S3/23

CPC分类号： H01S3/083 ,  H01S3/07 ,  H01S3/0813 ,  H01S3/0816 ,  H01S3/09415 ,  H01S3/10092

摘要： The laser beam generating apparatus (light source apparatus) comprising a laser oscillator structured as a ring resonator is provided with a plurality of excitation light sources and a plurality of solid state laser active media excited by these excitation light sources respectively, and these solid state laser active media are disposed separately each other on the optical path in the ring resonator. A high power laser beam is obtained stably and efficiently.

摘要翻译： 包括构成环形谐振器的激光振荡器的激光束发生装置（光源装置）分别设置有多个激发光源和由这些激发光源激发的多个固态激光活性物质，这些固态激光器 活性介质在环形谐振器的光路上分开设置。 获得稳定高效的高功率激光束。

公开(公告)号：US5349603A

公开(公告)日：1994-09-20

申请号：US976276

申请日：1992-11-13

申请人： Yushi Kaneda ,  Michio Oka

发明人： Yushi Kaneda ,  Michio Oka

IPC分类号： H01S3/08 ,  H01S3/094 ,  H01S3/139 ,  H01S3/16

CPC分类号： H01S3/08 ,  H01S3/08072 ,  H01S3/09408 ,  H01S3/09415

摘要： A solid-state laser resonator includes a pair of reflectors 4, 5, a bar-like laser medium 6, a plurality of point laser sources 1, 2 and resonator including a plurality of resonator portions. At least one of the paired reflectors 4, 5 has a curved-surface mirror. The laser medium 6 is interposed between the paired reflectors 4, 5. Laser beams 8 emitted from the point laser sources 1, 2 are passed through one of the paired reflectors 4, 5 and irradiated as pumping lights on one end face of the laser medium 6. The resonators include the pair of reflectors, the laser sources 1, 2 and a plurality of thermal lenses. The thermal lenses are formed within the laser medium 6. The resonators produce output laser beam to produce from the other end face of the laser medium 6 through other one of the reflector 5.

摘要翻译： 固体激光谐振器包括一对反射器4,5，棒状激光介质6，多个点激光源1,2和包括多个谐振器部分的谐振器。 配对反射器4,5中的至少一个具有曲面反射镜。 激光介质6插入在成对反射器4,5之间。从点激光源1,2发射的激光束8通过成对的反射器4,5中的一个，并在激光介质的一个端面上作为泵浦光照射 谐振器包括一对反射器，激光源1,2和多个热透镜。 热透镜形成在激光介质6内。谐振器产生输出激光束，以通过反射器5中的另一个从激光介质6的另一端面产生。

公开(公告)号：US20120307620A1

公开(公告)日：2012-12-06

申请号：US13464539

申请日：2012-05-04

申请人： Michio Oka ,  Hiroshi Yoshida ,  Kenji Tanaka

发明人： Michio Oka ,  Hiroshi Yoshida ,  Kenji Tanaka

IPC分类号： G11B7/135 ,  G02B3/02 ,  H01S5/06

CPC分类号： G11B7/126 ,  G11B7/127 ,  G11B7/1356 ,  G11B7/1372 ,  G11B7/1378 ,  H01S5/0657 ,  H01S5/1064 ,  H01S5/50

摘要： A light source device configured as a master oscillator power amplifier includes a mode locked laser unit having an external resonator and a semiconductor optical amplifier that amplifies and modulates laser light emitted from the mode locked laser unit. The width in a lateral direction of a waveguide on an incident side of the semiconductor optical amplifier is set so that a horizontal lateral mode of the waveguide on the incident side of the semiconductor optical amplifier becomes multiple modes, and a magnification conversion unit that converts a magnification of incident light from the mode locked laser unit to the semiconductor optical amplifier is disposed so that a basic mode is selectively excited in optical coupling on the incident side of the semiconductor optical amplifier.

摘要翻译： 配置为主振荡器功率放大器的光源装置包括具有外部谐振器的模式锁定激光器单元和放大并调制从锁模激光器单元发射的激光的半导体光放大器。 在半导体光放大器的入射侧的波导的横向的宽度被设定为使得半导体光放大器的入射侧的波导的水平横向模式变为多个模式，并且将倍率转换单元 从模式锁定激光单元到半导体光放大器的入射光的放大率被设置为使得在半导体光放大器的入射侧的光耦合中选择性地激发基本模式。