公开(公告)号：JPH11258646A

公开(公告)日：1999-09-24

申请号：JP6521398

申请日：1998-03-16

Applicant: SONY CORP

Inventor： YAMADA MASAHIRO ,  DOKO TORU ,  TAMADA HITOSHI

IPC: G02B6/12 ,  G02B6/13 ,  G02F1/29 ,  G02F1/35 ,  G02F1/355 ,  G02F1/37

Abstract: PROBLEM TO BE SOLVED: To provide a structure and an element which has a polarization inverted domain in a unique area (specially, depth) which was not seen before and the production method of them with good reproducibility. SOLUTION: After the polarization inverted domain 2 is formed at at least part of a ferroelectric substrate 1 to the overall substrate thickness (t) from one main surface 3 or almost to the overall depth, the ferroelectric substrate 1 is held below its Curie temperature for a given time to form the polarization inverted domain 2 to depth (d) which is 1/2 to 1 time as large as the substrate thickness (t) from the main surface 3 of the ferroelectric substrate 1. Here, the ferroelectric base body is formed of crystal LiNbx Ta1-x O3 (0

公开(公告)号：JPH09246586A

公开(公告)日：1997-09-19

申请号：JP4764496

申请日：1996-03-05

Applicant: SONY CORP

Inventor： DOI MASATO ,  DOKO TORU

IPC: H01L31/09

Abstract: PROBLEM TO BE SOLVED: To obtain a photodetector which can detect a polarizing component, which simplifies an optical system and which is made low-cost by providing a light absorption region of a linear continuously rugged structure. SOLUTION: A semiconductor layer 2 which is composed of i-type GaAs and which is of a first conductivity type and a semiconductor layer 3 which is composed of p-type GaAs are formed sequentially on a semiconductor substrate 1 which is composed of n-type GaAs. A linear rugged structure 4 as a light absorption region is formed of protruding parts 4b on which photodiodes PD's are formed and of recessed parts 4a which are formed down to the semiconductor substrate 1. A p-side electrode 5p is formed in a part in which the rugged structure 4 is not formed on the surface of the semiconductor substrate 1, and an electrode 5n is formed on the n-side on the rear. The rugged structure 4 has a cycle which is the same as the wavelength of incident light or which is shorter than the wavelength of the incident light. A polarizing component which is parallel to the rugged structure 4 out of the incident light is detected by the photodiodes PD's at the protruding parts 4b.

公开(公告)号：JPH06230444A

公开(公告)日：1994-08-19

申请号：JP1628793

申请日：1993-02-03

Applicant: SONY CORP

Inventor： DOKO TORU ,  TAMADA HITOSHI ,  WATARI AKIE ,  SAITO MAKI

IPC: G02F1/37 ,  G02F2/02

Abstract: PURPOSE:To avert the scattering loss of a basic wave by the core flanks of an optical waveguide and to efficiently obtain a second higher harmonic by constituting the optical wavelength conversion element in such a manner that light is made incident from one end of the optical waveguide and the second higher harmonic is obtd. by Cherenkov radiation. CONSTITUTION:The optical waveguide 10 of a charge type is constituted by forming a dielectric thin film 2 constituting the optical waveguide core on a nonlinear optical crystal substrate 1 and providing a dielectric charge part 3 on this dielectric thin film 2. This optical wavelength conversion element is so constituted that the second higher harmonic of lambda/2 wavelength is obtd. by the Cherenkov radiation when light of a wavelength lambda is made incident from one end of this optical waveguide 10. The incident basic wave of the wavelength lambda on the dielectric thin film 2 for constituting the optical waveguide core is confined and guided in the region where the dielectric charge part 3 is provided. A part of this basic wave is wavelength converted to the second higher harmonic of lambda/2 and is Cherekov radiated as a radiation mode. The element is constituted by patterning and forming only the dielectric substance charge part 3 to be charged and, therefore, the contamination of the optical waveguide core by etching is averted.

公开(公告)号：JP2005242379A

公开(公告)日：2005-09-08

申请号：JP2005121476

申请日：2005-04-19

Applicant: Sony Corp ,  ソニー株式会社

Inventor： TAMADA HITOSHI ,  YAMAGUCHI KYOJI ,  MATSUMOTO SHUICHI ,  DOKO TORU

IPC: G02B5/30

Abstract: PROBLEM TO BE SOLVED: To provide a polarizing optical element formed in a larger grid cycle than in the conventional manner and having an extinction ratio practically sufficient in the band of 800(nm) wavelength.
SOLUTION: The polarizing optical element applies polarizing action on the light of prescribed wavelength λ out of the light from a visible wavelength region to a near-infrared wavelength region, which are made up of wavelength from 400(nm) to 840(nm). In a metallic grid formed on a transparent substrate whose refractive index is n
1 , when the cross-sectional shape of each grid is set as an almost rectangle, and its thickness is defined as (h), its width in thickness 0.5h is defined as (b), a grid cycle is defined as (d), an angle formed by a base and a side surface is defined as (s), and a refractive index between the grids of the metallic grid is defined as n
2 and the refractive index of the upper part of the metallic grid is defined as n
3 , they satisfy the condition of the formula (1).
COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：提供以比常规方式更大的栅格周期形成的偏振光学元件，并且在800（nm）波长的带内具有实质上的消光比。 解决方案：偏振光学元件在从可见波长区域到近红外波长区域的光中对规定波长λ的光施加偏振作用，其由波长400（nm）至840（ 纳米）。 在形成在折射率为n 1 的透明基板上的金属网格中，当每个格栅的横截面形状被设置为几乎矩形，并且其厚度定义为（h）时，其 宽度0.5h定义为（b），网格周期定义为（d），由基底和侧面形成的角度定义为（s），金属网格网格之间的折射率 被定义为n 2 ，并且金属网格的上部的折射率被定义为n 3 ，它们满足式（1）的条件。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JPH06289449A

公开(公告)日：1994-10-18

申请号：JP33362693

申请日：1993-12-27

Applicant: SONY CORP

Inventor： DOKO TORU ,  TAMADA HITOSHI ,  SAITO MAKI

IPC: G02F1/37 ,  G02F2/02

Abstract: PURPOSE:To prevent the presence of knots in the intensity distribution of exit light by specifying the thickness or width of an optical waveguide core and the refractive index of this optical material and emitting guided light of a higher mode with the unimodal intensity distribution. CONSTITUTION:A thin film 12 of Ta2O5 is formed as the optical waveguide core on a nonlinear optical crystal substrate 11 consisting of a single crystal (a) plate of KTiOPO4 (a substrate having the face orthogonal with the a-axis of the crystal as a plate face) and patterns 13 of SiO2 are loaded thereon, by which the charge type optical waveguide is formed. The refractive index of the optical material constituting the optical waveguide core 12 is set higher by >=0.1 than the refractive index of the optical material constituting the substrate 11 and thickness T or width W of the optical waveguide core 12 is set smaller than the wavelength in the air of the guided light. As a result, the light is confined and guided in the range narrower than the wavelength in the air in the optical waveguide core 12 even if the waveguide mode is a higher mode of a first order or above and, therefore, the unimodal intensity distribution free from the knots is obtd. at the time the light is emitted outside.

公开(公告)号：JPH0635018A

公开(公告)日：1994-02-10

申请号：JP20704292

申请日：1992-07-13

Applicant: SONY CORP

Inventor： KIJIMA KOUICHIROU ,  TAMADA HITOSHI ,  DOKO TORU

IPC: G02B6/42 ,  G02F1/37 ,  H01S3/109 ,  H01S5/00 ,  H01S3/18

Abstract: PURPOSE:To eliminate the need for applying an AR coating on the end face of an optical waveguide and to facilitate the miniaturization of the device. CONSTITUTION:A semiconductor laser chip 1 generates a basic wave laser beam. An L-shaped fixing member 7 and an adhesive 8 fix and support a heat sink 3 and a wavelength conversion element 6 by aligning the electric field direction of the semiconductor laser chip and the electric field direction of the optical waveguide 4 in such a manner that the optical waveguide 4 exists in proximity to the end face of the semiconductor laser chip 1. The basic wave laser beam is, therefore, guided to the optical waveguide 4.

公开(公告)号：JP2000206449A

公开(公告)日：2000-07-28

申请号：JP951799

申请日：1999-01-18

Applicant: SONY CORP

Inventor： DOKO TORU

IPC: G01J3/45 ,  G02B6/00 ,  G02B6/32 ,  G02B13/16 ,  G02B27/09 ,  G02F1/13 ,  G03B15/05 ,  G03B21/14

Abstract: PROBLEM TO BE SOLVED: To reduce spatial coherence or speckles, in spite of device compact constitution which is capable of industrial mass-production. SOLUTION: Luminous flux emitted from a light source 11 emitting coherent light is divided into plural areas by a transparent optical device 13 and illuminates nearly the same surface to be irradiated 16 through respective divided areas. The difference of an optical path from the light source 11 leading to one optical point on the surface 16 is made different at least between two areas out of the plural areas.

公开(公告)号：JPH11344683A

公开(公告)日：1999-12-14

申请号：JP15484598

申请日：1998-06-03

Applicant: SONY CORP

Inventor： DOKO TORU

IPC: G02B27/09 ,  G02B27/10 ,  H01L21/027 ,  H04N5/74

Abstract: PROBLEM TO BE SOLVED: To provide an optical element, optical device, lighting device, image display device, and exposure device which reduce spatial coherence or speckles. SOLUTION: A 1st reflecting surface 5 has reflecting surfaces 5a disposed in parallel to one another at constant intervals (d) while slanting at about 45 deg. to the optical axis of incident coherent light and a 2nd reflecting surface 7 has reflecting surface 7a disposed in parallel to one another at constant intervals (d) while slanting at about 45 deg. to the optical axis of reflected light on the 1st reflecting surface 5; and the incident coherent light is reflected by the 1st reflecting surface 5 and 2nd reflecting surface 7 to generate luminous flux consisting of areas having constant optical path differences in order and branch light is emitted from the 2nd reflecting surface 7.

公开(公告)号：JPH11337868A

公开(公告)日：1999-12-10

申请号：JP14851998

申请日：1998-05-29

Applicant: SONY CORP

Inventor： DOKO TORU

IPC: G02B5/30 ,  G02B27/09

Abstract: PROBLEM TO BE SOLVED: To provide an optical element, an optical device, an luminaire, a picture display device, and an exposure device which reduce space coherence or speckles. SOLUTION: A first optical element (first beam splitter stack 4) having plural first semi-transmission mirror faces 4a which are inclined at 45 deg. with respect to the optical axis of incident light and are arranged in parallel at intervals of a certain gap d1 , a half-wave plate 5 which rotates the direction of polarization of reflected light on plural first semi-transmission mirror faces 4a at 90 deg., and a second optical element (second beam splitter stack 6) having plural second semi-transmission mirror faces 6a which are inclined at 45 deg. with respect to the optical axis of reflected light on plural first semi-transmission mirror faces 4a and are arranged in parallel at intervals of a certain gap d2 are provided, and light incident on plural first and second semi-transmission mirror faces 4a and 6a is successively partially reflected and partially transmitted, and branch light consisting of plural luminous fluxes having a certain optical path length difference is successively emitted from plural second semi-transmission mirror faces 6a.

公开(公告)号：JP2000268603A

公开(公告)日：2000-09-29

申请号：JP7432999

申请日：1999-03-18

Applicant: SONY CORP

Inventor： DOKO TORU

IPC: G02B19/00 ,  F21S2/00 ,  F21V5/00 ,  G02B3/00 ,  G03B27/54

Abstract: PROBLEM TO BE SOLVED: To provide a lighting system and a lighting method capable of reducing speckles with a compact and simple structure. SOLUTION: This lighting system 20 is equipped with a semiconductor laser 11 as a coherent light source to emit coherent light, a lens array 13 having plural element lenses 22 placed side by side to divide the coherent light emitted from the coherent light source into plural pieces of light flux equivalent to the number of element lenses, and light convergence lenses 14, 15 to converge a plurality of light flux so as to illuminate the almost same area 16 to be irradiated at their focus positions. Thereby, speckles can be reduced in the area to be irradiated.