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51. 发明专利

JPH07107585B2 失效
公开(公告)号：JPH07107585B2
公开(公告)日：1995-11-15
申请号：JP20268586
申请日：1986-08-30
IPC分类号： G02B6/12 , G02F1/03 , G02F1/035 , G02F1/21

52. 发明专利

JPH0769520B2 失效
公开(公告)号：JPH0769520B2
公开(公告)日：1995-07-31
申请号：JP50541386
申请日：1986-10-16
IPC分类号： G02B6/42 , G01B9/02 , G01D5/26 , G01J3/18 , G01J3/26 , G02B5/28 , G02B6/12 , G02B6/122 , G02B6/28 , G02B6/32 , G02B6/34 , G02B6/35 , G02B6/36 , G02B6/38 , G02B7/00 , G02B7/182 , G02B26/00 , G02B26/02 , G02B26/08 , G02B26/10 , G02F1/21 , H01L21/52 , H01L31/02 , H01S3/02 , H01S3/10 , H01S3/1055 , H01S5/00 , H01S5/14

53. 发明专利

JPH07140499A WRITING METHOD FOR ORGANIC PHOTOREFRACTIVE MEDIUM AND ORGANIC PHOTOREFRACTIVE MEDIUM 失效
公开(公告)号：JPH07140499A
公开(公告)日：1995-06-02
申请号：JP31395893
申请日：1993-11-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SHIMADA TOSHIYUKI , ARISHIMA KOICHI , YOKOYAMA KENJI , SUKEGAWA TAKESHI
IPC分类号： G02F1/21 , G02F1/35 , G02F1/355 , G02F1/361 , G03H1/02
摘要： PURPOSE:To provide an org. photorefractive medium capable of developing a photorefractive effect with impression of an electric field weaker than heretofore and widening the spacings between interference fringes and the method for writing spatial diffraction gratings on the org. photorefractive medium. CONSTITUTION:This writing method for the org. photorefractive medium comprises making two light beams 3, 4 incident on the flat planar org. photorefractive medium having transparent optical waveguides 2 at both ends from a direction which is perpendicular to the thickness direction of the medium and is symmetrical to the plane passing the center of the thickness. This org. photorefractive medium is constituted by joining a material having the refractive index nearly equal to the refractive index of the photorefractive material on the outer side of the transparent optical waveguides 2 of the flat planar org. photorefractive medium having the transparent optical waveguides on both end faces. An example of the high polymer material to be used includes a poly(methyl methacrylate).

54. 发明专利

JPH07504994A 失效
公开(公告)号：JPH07504994A
公开(公告)日：1995-06-01
申请号：JP50938493
申请日：1992-11-05
IPC分类号： G02F1/13 , G02F1/1335 , G02F1/13363 , G02F1/1337 , G02F1/1343 , G02F1/1347 , G02F1/135 , G02F1/137 , G02F1/139 , G02F1/141 , G02F1/21
摘要： The present invention provides optical modulators which comprise aligned chiral smectic liquid crystal cells within an optical resonance cavity. The cavity configurations include symmetric and asymmetric Fabry-Perot etalons. The liquid crystal cells can be planar- or homeotropically-aligned and can be discrete state or analog cells. The device configurations of the present invention provide discrete or continuous optical modulation of the phase, intensity, and wavelength of elliptically polarized light, without requiring polarization analyzers. The modulators are optically or electronically addressable in single pixels or arrays of multiple pixels. Certain homeotropically-aligned cells are provided as an aspect of this invention, as are certain variable retarders comprised of planar-aligned cells in combination with birefringent elements.

55. 发明专利

JPH0735962B2 失效
公开(公告)号：JPH0735962B2
公开(公告)日：1995-04-19
申请号：JP40104090
申请日：1990-12-10
IPC分类号： G01B9/02 , G01J9/02 , G02F1/21

56. 发明专利

JPH0728100A LIGHT MODULATION DEVICE AND CONOSCOPIC HOLOGRAPHY-SYSTEM 失效
公开(公告)号：JPH0728100A
公开(公告)日：1995-01-31
申请号：JP21167791
申请日：1991-07-29
申请人： CENTRE NAT ETD TELECOMM
发明人： AHARON AGURANATO , GABURIERU SHIRAATO
IPC分类号： G02F1/17 , G02F1/01 , G02F1/21 , G03C1/725 , G03H1/06
摘要： PURPOSE: To realize removal of a continuous wave component and control of an optimum transmittance while keeping the dynamic range of light to be transmitted by providing a crystal in the cavity part of an interference system having a transmittance-optical distance characteristic and applying an external electric field to the crystal. CONSTITUTION: Crystal 1 having a refracting property is arranged in an optical cavity part of an interferometer system 2 which has an inclination to lead a dynamic range where the transmittance is most changed for the least change of the refractive index. The range of the cavity part is determined by semitransparent mirrors 21 and 22. When write-in light qe is made incident, it is absorbed by the refractive index of crystal 1, and when a read light q1 is made incident next, the transmittance characteristic of the interferometer 2 is changed because the refractive index of crystal 1 is changed by the write-in light qe already made incident. Further, the optimum transmittance is controlled to a desired value by the electric field with can control the refractive index of crystal. Consequently, the dynamic range is increase in accordance with the inclination of the transmittance-optical distance characteristic.

57. 发明专利

JPH0720510A FULLY OPTICAL ELEMENT 失效
公开(公告)号：JPH0720510A
公开(公告)日：1995-01-24
申请号：JP16445593
申请日：1993-07-02
申请人： NEC CORP
发明人： TAJIMA KAZUTO
IPC分类号： G02F1/21 , G02F1/225 , G02F1/313 , G02F1/35 , G02F3/00
摘要： PURPOSE:To provide the Mach-Zehnder type fully optical element with which the switch off time does not depend on the relaxation time of a nonlinear effect by introducing control light into respective optical nonlinearity developing parts of both arms of a Mach-Zehnder system. CONSTITUTION:This fully optical element has control light input ports A, B at both arms A, B of the Mach-Zehnder system. The control light B changes the refractive index of the nonlinear waveguide B by photoexciting the nonlinear waveguide B of the arm B. The control light A excites the arm A 50ps after excitation by the control light B. The pulse energy of the control light A is the extent of exiting the carriers remaining in the nonlinear waveguide B at the moment the control light A excites the nonlinear waveguide A and is weaker than the control light B. The effective lengths of both arms A, B are, therefore, made into the same at the moment the control light A excites the nonlinear waveguide A. Then, the output light thereof rapidly rises (switch on) at the excitation of the control light B and rapidly restores the original state (switch off) at the moment of the excitation of the control light A.

58. 发明专利

JPH077231A ASYMMETRICAL Y BRANCH OPTICAL DEVICE 失效
公开(公告)号：JPH077231A
公开(公告)日：1995-01-10
申请号：JP31567993
申请日：1993-12-16
申请人： AMERICAN TELEPHONE & TELEGRAPH
发明人： MAAKU II KUTSUNETSUTOSOBU
IPC分类号： G02B6/122 , G02B6/12 , G02B6/125 , G02B6/34 , G02F1/21 , G02F1/225 , G02F1/313 , H01S3/10 , H01S5/00 , H01S5/0625 , H01S5/065 , H01S5/10 , H01S5/50 , H04Q11/00 , H01S3/18
摘要： PURPOSE: To provide a laser, having a wide tuning range by providing an optical Y-joint at each one end of first, second, and third of an optical branch wave body with each end of first, second, and third path length which has a path length longer than the second, while the other ends of the second and third are terminated to a common flat surface. CONSTITUTION: An optical wave director of an array constitutes a first branch 26 combined to both first and third branches 30 and 32 through a Y-joint element 28. These two branches 30 and 32 of an asymmetrical Y-branch are terminated vertical with respect to the propagation of the two wave bodies, to points 46 and 48 in common with the flat surface. The two branches 30 and 32 of the asymmetrical Y-branch have different lengths required for the normal operation of a Mach-Zehnder interferometer. Three control electrodes 34, and 44 are provided on the corresponding branches 26, 30, and 32, each having a gain. By extending an asymmetrical Y-branch optical element at a right-angle plane, the Mach-Zehnder interferometer is incorporated in a frequency-selection mechanism lying on a lower side.

59. 发明专利

JPH06508697A 失效
公开(公告)号：JPH06508697A
公开(公告)日：1994-09-29
申请号：JP50664592
申请日：1992-02-05
IPC分类号： G02F1/13 , G02F1/01 , G02F1/133 , G02F1/21
摘要： A compensator for thermal or other uncontrollable effects in a liquid-crystal etalon filter. The narrow pass band of the filter is controlled by adjusting the amplitude of an AC drive signal applied to the electrodes on either side of the liquid crystal in the filter. An optical detector detects the intensity of light from a narrow-bandwidth input beam passed by the detector. Electrical circuitry determines the bipolar amplitude of the component of the light intensity that is at twice the frequency of the AC drive signal (the doubled-frequency amplitude) and adjusts the amplitude of the AC drive signal in response to the doubled-frequency amplitude so as to reduce the doubled-frequency amplitude toward zero.

60. 发明专利

JPH06507732A 失效
公开(公告)号：JPH06507732A
公开(公告)日：1994-09-01
申请号：JP50949892
申请日：1992-05-08
IPC分类号： C09K9/00 , G02F1/15 , G02F1/155 , G02F1/21

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