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公开(公告)号：EP0035299A3
公开(公告)日：1981-09-23
申请号：EP81200186
申请日：1981-02-18
CPC分类号： G09F9/372 , G02B26/001 , G02F1/21
摘要： A display device having a transparent supporting plate (10) which is provided with transflective regions (11). At a short distance from the first supporting plate (10) resilient electrodes (14) are connected which are manufactured from a partially reflective material. By varying the distance between the resilient electrodes (10) and the transflective regions (11), the reflection of incident light can be controlled from zero to maximum intensity as a result of the occurring interference. Both monocolour and multicolour pictures can be displayed by means of such a display device. Such a display device is particularly suitable for use in a projection television device.
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公开(公告)号：EP0078454A3
公开(公告)日：1984-08-01
申请号：EP82109696
申请日：1982-10-20
发明人： Carlsen, W. John , Melman, Paul
摘要： interferometric multimode fiber optic switches and modulators include combinations of various components. Two electro-optical crystals (27, 37) have a dielectric beam splitting coating (48) affixed to portions thereof. The coated portions of the two crystals are juxtaposed. Means (17, 18, 19, 20, 22, 51, 52, 53, 54) are provided for varying the indices of refraction of the two crystals (27, 37) with respect to each other. Light entering into the first crystal (27) and travelling within the two crystals (27, 37) can be switched to selectively exit from one crystal (27) or from the other (37) by varying the index of refraction of one of the crystals (27, 37) with respect to that of the other. By interferometric principle of operation, the phase relation of light is transformed into spacial direction. The crystals (27, 37) can be selected from the group consisting of lithium niobate, lithium tantalate, and barium strontium niobate. The dielectric beam splitting coating (48) can be formed of multiple layers of material such as zirconium oxide and silicon dioxide. The indices of refraction of the crystals (27, 37) are varied by applying electric fields of one polarity at opposite surfaces thereof. Light enters the various crystals (27, 37), and is reflected, and is transmitted at various surfaces (31, 34, 42, 46) thereof so that, upon entering a particular area, within the crystals (27, 37), reinforcement or interference of light can occur.
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公开(公告)号：EP0260073A3
公开(公告)日：1988-10-05
申请号：EP87307812
申请日：1987-09-04
CPC分类号： G02F1/216 , G02F1/1393 , G02F1/1396 , G02F1/1397 , G02F1/141 , G02F2203/055
摘要： An electro-optic modulator consists of a Fabry-Perot etalon (10) containing intra-cavity liquid crystal material (12) between mirror layers (16). Each mirror (16) bears a respective rubbed polyimide layer (18), which provides homogeneous alignment (20) of the liquid crystal molecules. The mirror layers (16) are connected to a bias voltage source (24), which provide an electrical bias variable between two values both above the threshold for refractive index sensitivity to applied voltage. For nematic materials, this is the Freedricks threshold or transition. The bias variation provides optical modulation of the etalon transmission with a time constant which is much shorter than devices switching between voltages either side of the threshold.
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4.发明公开Optical measuring device using a spectral modulation sensor having an optically resonant structure 失效使用具有光学谐振结构的光谱调制传感器的光学测量装置
公开(公告)号：EP0172623A3
公开(公告)日：1986-08-20
申请号：EP85304526
申请日：1985-06-25
发明人： Saaski, Elric W. , Hartl, James C.
CPC分类号： G01L9/0079 , G01D5/268 , G01J3/26 , G01K11/12 , G01N21/45 , G01N21/75 , G01N21/7703 , G01N21/7746 , G01N21/80 , G01N21/81 , G01N2021/0385
摘要： Physical changes induced in the spectral modulation sensor's optically resonant structure by the physical parameter being measured cause micrcshifts of its reflectivity and transmission curves, and of the selected operating segment(s) thereof being used, as a function of the physical parameter being measured. The operating segments have a maximum length and a maximum microshift of less than about one resonance cycle in length for unambiguous output from the sensor. The input measuring light wavelength(s) are selected to fall within the operating segment(s) over the range of values of interest for the physical parameter being measured. The output light from the sensor's optically resonant structure is spectrally modulated by the optically resonant structure as a function of the physical parameter being measured. The spectrally modulated output light it then converted into analog electrical measuring output signals by detection means. In one form, a single optical fiber carries both input light to and output light from the optically resonant structure. When more than one input measuring light wavelength is used, means may also be provided to divide the input light wavelengths into two portions and then take the ratio thereof. This provides several advantages simultaneously, such as enabling longer operating segments and microshifts to be used for greater sensitivity or detection range, and also eliminates certain errors caused by fluctuations in input light intensity or by changes in light intensity caused by optical fiber bending and optical fiber connectors.
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公开(公告)号：EP0213778A3
公开(公告)日：1988-05-04
申请号：EP86306010
申请日：1986-08-04
CPC分类号： G02B6/29352 , G01D5/35303 , G02B6/2821 , G02B6/2835
摘要： A Mach Zehnder interferometer comprises a single optical fibre incorporating two coaxially disposed waveguides (1, 2), e.g. a rod waveguide (1) and a surrounding tube waveguide (2), and having a pair of axially spaced tapered regions forming couplers between the two waveguides at said regions.
摘要翻译： 马赫曾德尔干涉仪包括单个光纤，其中包含两个同轴布置的波导（1,2），例如， 杆波导（1）和周围管波导（2），并且具有在所述区域处的两个波导之间形成耦合器的一对轴向间隔开的锥形区域。
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6.发明公开Arrangement for the external modulation of radiation emitted by a high-performance CO2 laser 失效由高性能二氧化碳激光器发射的辐射的外部调制装置
公开(公告)号：EP0167843A3
公开(公告)日：1988-01-07
申请号：EP85107077
申请日：1985-06-07
CPC分类号： G02F1/21 , B23K26/06 , B23K26/0604 , B23K26/064 , B23K26/0643
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公开(公告)号：EP0092831A3
公开(公告)日：1986-03-12
申请号：EP83104040
申请日：1983-04-25
发明人： Yoshida, Kenichi c/o Sumitomo Electric , Ono, Kimizo c/o Sumitomo Electric , Yokohara, Takashi c/o Sumitomo Electric , Nishiwaki, Yoshikazu c/o Sumitomo Electric , Tsuno, Koichi c/o Sumitomo Electric
CPC分类号： G01C19/722
摘要： An optical fiber gyro is improved by providing the various optical elements on a single substrate. Optical wave-guides are formed on the substrate by providing diffusion regions, and light branching means for dividing a laser light beam may take the form of a grating, a directional coupler, etc. The light source is typically a laser device bonded to the substrate and the light receiver a photodiode. These elements may be made monolithically with the substrate when the latter is a compound semiconductor such as e.g. GaAs. If desired, one of the wave-guides may be associated with a phase shifter or modulator for detection purposes.
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公开(公告)号：EP0259171A3
公开(公告)日：1988-10-19
申请号：EP87307813
申请日：1987-09-04
摘要： An optically bistable device comprises a Fabry-Perot etalon 10 containing intracavity liquid crystal material 14. Etalon mirrors 18 of deposited silver are overlaid on indium tin oxide electrodes 16. The electrodes 16 provide electrical biassing means for the material 14, which exhibits both optical nonlinearity and electro-optic tunability of refractive index. The etalon 10 has an interference fringe maximum 64 at a wavelength λ m1 . The fringe is tunable to λ m2 by applying a bias voltage across the mirrors 18. A light beam 26 illuminates the etalon 10, the beam 26 having a wavelength λ s where λ m2 is between λ s and λ m1 . The beam intensity is sufficient to induce bistable etalon switching for a fringe at λ m2 but not for a fringe at λ m1 . Tuning the etalon fringe electro-optically from λ m1 to λ m2 initiates optical bistability without the prior art requirement of either variable light intensity or an external electrical feedback loop.
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公开(公告)号：EP0245977A3
公开(公告)日：1988-10-05
申请号：EP87303607
申请日：1987-04-24
发明人： Absley, Norman
IPC分类号： G02F01/015 , G02F01/03 , G02F01/21
CPC分类号： G02F1/218
摘要： An electro-optical device is arranged as a Fabry Perot etalon (10) comprising two mirrors (18,24) and a central region (22). The mirrors (18,24) are multilayer heterostructures of Al x Ga 1-x As semiconductor materials where x alternates between 1.0 and 0.3. The central region (22) may be a multiple quantum well structure of Al x Ga 1-x As where x alternates between 0 and 0.3. The etalon material doping is non-uniform so that it is electrically a semiconductor device (10) with a biasable central region (22). The optical path length in the central region (22) is electric field dependent, and the etalon transmission or reflection is accordingly modulatable by varying the central region bias. The mirrors (18,24) may be heavily doped and of opposite conductivity type with the central region (22) undoped. This provides a PIN diode. Light incident on the etalon (10) executes multiple transits of the central region (22). It is therefore unnecessary to employ long path lengths and high fields to enhance weak electro-optical effects in order to produce significant modulation, this being necessary in prior art devices.
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公开(公告)号：EP0158505A3
公开(公告)日：1985-11-21
申请号：EP85302338
申请日：1985-04-03
申请人： TRW INC.
CPC分类号： G01J9/02
摘要： An interferometer, and corresponding method, for use in the measurement and correction of wavefront aberrations in a beam of radiation. The interferometer includes optical elements for generating a reference beam with a known wavefront phase characteristic. The reference beam is recombined with the sample beam, to produce an interference pattern indicative of the phase aberrations in the sample beam as compared with the reference beam. An array of detectors produces electrical signals corresponding to discrete elements of the detected pattern, and an electrical circuit for each elemental detector generates phase correction signals to be applied to a set of movable mirror elements arranged to effect phase changes in the sample beam path. The movable mirror elements adjust the elemental path lengths of the sample beam to yield zero detected phase differences. The mirror elements may be integrated into the interferometer, or may take the form of a deformable mirror used for phase compensation of a light beam. The reference beam in the preferred form of the invention is dithered at a high frequency to minimize the effect of noise, and each electrical circuit includes a synchronous detector to remove the dither-frequency component. In accordance with one disclosed form of the invention, the reference beam is not planar but is aberrated in a conjugate relationship with the radiation beam to be corrected, to provide improved control loop performance.
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