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    Optical filters
    133.
    发明公开
    Optical filters 失效
    Optische过滤器

    公开(公告)号：EP0310438A1

    公开(公告)日：1989-04-05

    申请号：EP88309138.1

    申请日：1988-09-30

    Applicant: BRITISH TELECOMMUNICATIONS public limited company

    Inventor： Chamberlin, Giles Russell ,  Payne, David Brian ,  McCartney, David John

    IPC: G02B6/34

    CPC classification number: G02B6/4246 ,  G02B6/02085 ,  G02B6/29311 ,  G02B6/29323 ,  G02F1/011 ,  G02F1/0115 ,  G02F2201/302 ,  G02F2203/055

    Abstract: An optical filter comprises a volume diffraction grating (1) provided within a waveguide. The grating (1) has a thickness T sufficient such that when an optical beam R is incident on the grating from outside the waveguide, wavelengths at or near the Bragg wavelength for the grating are diffracted and coupled into the waveguide, all but the first order interferences being substantially eliminated, whilst wavelengths away from the Bragg wavelength pass through the waveguide substantially undiffracted. The grating pitch L may be varied to permit tuning of the filter response.

    Abstract translation: 光学滤波器包括设置在波导内的体积衍射光栅（1）。 光栅（1）具有足够的厚度T，使得当光束R从波导外部入射到光栅上时，用于光栅的布拉格波长处或附近的波长衍射并耦合到波导中，除了第一级 基本上消除了干扰，而远离布拉格波长的波长基本上不透过波导。 光栅间距L可以改变以允许调谐过滤器响应。

    Light modulator and wave guide device
    134.
    发明公开
    Light modulator and wave guide device 失效
    光调制器和波导装置

    公开(公告)号：EP0219069A3

    公开(公告)日：1988-11-17

    申请号：EP86114032

    申请日：1986-10-10

    Applicant: Fuji Photo Film Co., Ltd.

    Inventor： Okazaki, Yoji c/o Fuji Photo Film Co., Ltd. ,  Sunagawa, Hiroshi c/o Fuji Photo Film Co., Ltd. ,  Kamiyama, Kozi c/o Fuji Photo Film Co., Ltd.

    IPC: G02F01/29 ,  H04N01/12

    CPC classification number: H04N1/1275 ,  G02F1/0147 ,  G02F1/295 ,  G02F2201/302 ,  G06K15/1285 ,  H04N1/12

    Abstract: A light modulator comprises a stack of a wave guide layer (11) and an adjacent layer (12) normally exhibiting a refractive index smaller than that of the wave guide layer, at least one of these layers being formed of a material whose refractive index changes by application of energy. An energy applicator is provided at least in one of these layers, and a dielectric grating (G) is positioned at the surface of the adjacent layer (12) over a section where energy is applied by the energy applicator. A drive circuit is provided for energizing the energy applicator and causing a change in refractive index to arise in the wave guide layer (11) and/or the adjacent layer (12) so that wave guided inside of the wave guide layer (11) is radiated out of the stack by interaction with the dielectric grating (G). In a wave guide device, the wave guide layer (11) is formed of a thermo-optic material in which the thermal coefficient of refractive index is zero or negative, and the adjacent layer (12) is formed of a thermo-optic material exhibiting a positive thermal coefficient of refractive index.

    TERAHERTZ WAVE GENERATION APPARATUS
    136.
    发明公开
    TERAHERTZ WAVE GENERATION APPARATUS 审中-公开
    TERAHERTZ波发电装置

    公开(公告)号：EP3203314A1

    公开(公告)日：2017-08-09

    申请号：EP17152680.9

    申请日：2017-01-23

    Applicant: Shibuya Corporation

    Inventor： KAWASE, Kodo ,  NAKA, Toshiaki ,  SASAKI, Motoi ,  TSUCHIYA, Akito

    IPC: G02F1/39 ,  G02F1/35 ,  H01S3/00

    CPC classification number: G02F1/3501 ,  G02F1/3532 ,  G02F1/39 ,  G02F2001/3503 ,  G02F2001/3507 ,  G02F2001/392 ,  G02F2201/302 ,  G02F2203/13 ,  H01S3/0092 ,  H01S2302/02

    Abstract: In a terahertz wave generation apparatus including a first non-linear optical crystal 3 on which first laser L1 and second laser L2 from laser generation means 2 are incident to generate terahertz wave TH1, the laser generation means includes a second non-linear optical crystal 7 on which laser having the same wavelength as that of the second laser is incident to generate idler light L1 including a plurality of wavelengths, and makes the idler light L1 generated from the second non-linear optical crystal incident on the first non-linear optical crystal as the first laser L1, to generate terahertz wave including a plurality of wavelengths from the first non-linear optical crystal 3, and wavelength selection means including a transmission section which transmits an idler light having the specific wavelength in the idler light including the plurality of wavelengths can be provided, as needed. Thus, terahertz wave having a high output power and including a plurality of wavelengths can be obtained, and the wavelength selection means easily obtains a required terahertz wave having the specific wavelength.

    Abstract translation: 在包括第一非线性光学晶体3的太赫波产生装置中，激光产生装置包括第二非线性光学晶体7，来自激光产生装置2的第一激光L1和第二激光L2入射在第一非线性光学晶体3上以产生太赫波TH1 在其上入射具有与第二激光相同波长的激光以产生包括多个波长的闲光L1，并且使从第二非线性光学晶体产生的闲频光L1入射到第一非线性光学晶体上 作为第一激光L1，从第一非线性光学晶体3产生包括多个波长的太赫兹波;以及波长选择装置，包括透射部分，该透射部分在包括多个激光束的空载光中透射具有特定波长的空闲光 根据需要可以提供波长。 因此，可以获得具有高输出功率并且包括多个波长的太赫兹波，并且波长选择装置容易地获得具有特定波长的所需太赫兹波。

    Tunable resonant grating filters
    137.
    发明公开
    Tunable resonant grating filters 有权
    激光器外部振荡器和电容器共振Gitterfilter

    公开(公告)号：EP1939653A2

    公开(公告)日：2008-07-02

    申请号：EP08154863.8

    申请日：2003-12-24

    Applicant: Pirelli & C. S.p.A.

    Inventor： Pietra, Giulia ,  Gorni, Giacomo Maria

    IPC: G02B5/20

    CPC classification number: G02B6/12007 ,  G02B6/124 ,  G02F1/216 ,  G02F2201/302 ,  G02F2203/055 ,  G02F2203/15 ,  H01S3/08059 ,  H01S3/105 ,  H01S3/1055 ,  H01S5/12 ,  H01S5/141 ,  H01S5/142

    Abstract: The invention relates to an external-cavity tunable laser (60) system configured to emit radiation at a laser emission wavelength, the tunable laser system comprising an external cavity having a plurality of cavity modes. The external cavity includes a gain medium (61) to emit an optical beam into the external cavity, and a tunable optical resonant grating filter (66;20;40) reflecting the optical beam at a resonant wavelength. The filter comprises a diffraction grating (23;52), a planar waveguide (28;46) optically interacting with the diffraction grating (23;52), the diffraction grating and the planar waveguide forming a resonant structure, and a light transmissive material having a selectively variable refractive index to permit tuning of the filter. The light transmissive material is a liquid crystal material or a thermo-optical material having a thermo-optic coefficient of not less than 10 -4 /°C so as to form a tunable cladding layer (30;43) for the planar waveguide. The planar waveguide (28;46) is placed between the diffraction grating (23;52) and the tunable cladding layer (30;43).

    Abstract translation: 本发明涉及被配置为以激光发射波长发射辐射的外部可调谐激光器（60）系统，该可调谐激光系统包括具有多个腔模式的外部空腔。 外部空腔包括向外部空腔发射光束的增益介质（61）和以共振波长反射光束的可调光学谐振光栅滤波器（66; 20; 40）。 滤光器包括衍射光栅（23; 52），与衍射光栅（23; 52）光学相互作用的平面波导（28; 46），衍射光栅和形成谐振结构的平面波导，以及具有 选择性地可变的折射率以允许调谐过滤器。 透光材料是具有不小于10 -4 /℃的热光系数的液晶材料或热光材料，以形成用于平面波导的可调谐包层（30; 43）。 平面波导（28; 46）被放置在衍射光栅（23; 52）和可调谐包层（30; 43）之间。

    Optoelektronisches Bauelement mit kodirektionaler Modenkopplung
    140.
    发明公开
    Optoelektronisches Bauelement mit kodirektionaler Modenkopplung 失效

    公开(公告)号：EP0768740A1

    公开(公告)日：1997-04-16

    申请号：EP96114847.5

    申请日：1996-09-16

    Applicant: SIEMENS AKTIENGESELLSCHAFT

    Inventor： Amann, Markus-Christian, Prof.-Dr. ,  Illek, Stefan, Dr.

    IPC: H01S3/085 ,  G02F1/313 ,  G02B6/34

    CPC classification number: G02B6/12007 ,  G02B6/4215 ,  G02B2006/12107 ,  G02B2006/12147 ,  G02F1/3132 ,  G02F1/3133 ,  G02F2001/3135 ,  G02F2201/30 ,  G02F2201/302 ,  H01S5/06206 ,  H01S5/1032 ,  H01S5/1035

    Abstract: Optoelektronisches Bauelement, bei dem zwei Wellenleiterschichten (WG1, WG2) und eine Schicht (Δn) mit einer periodischen Strukturierung vorhanden sind, die parallel zueinander angeordnet und so bemessen sind, daß zwischen in diesen Wellenleiterschichten geführten Moden eine kodirektionale Kopplung bewirkt ist, und bei dem nicht für diese Kopplung erforderliche und daher unerwünschte Sprünge in den Realteilen der für eine Wellenführung dieser Moden maßgeblichen effektiven Brechungsindizes dadurch vermieden sind, daß in dieser periodisch strukturierten Schicht oder in einer weiteren Schicht stetige oder mehrfach abgestufte Änderungen der bezüglich der Schichtebenen lateralen oder vertikalen Abmessung oder der Materialzusammensetzung in der für die Fortpflanzung der Moden vorgesehenen Richtung vorhanden sind.

    Abstract translation: 光电子元件具有两个波导层（WG1，WG2）和具有周期性结构的层（DELTA n），其平行布置在夹层结构中，使得中间由层引导的模式（R，S），共同方向 获得耦合。 周期性层结构导致模式的分散或扩展，并且沿着模式色散的方向通过横向或垂直尺寸或材料组成的阶梯式变化形成。

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