• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An optical resonant assembly which has at least two levels of optical transmittance dependent on incident light beams. The assembly consists of a pair of parallel mirrors 3 with a photochromic material 5 placed between them which has a refractive index dependet upon the intensity of incident light beams 1 the parallel mirrors constituting a Fabry-Perot type resonator. The incident light beams 15 «colouring» or «bleaching» the photochromatic material 5.
    公开号:SU1602406A3
    申请号:SU864028011
    申请日:1986-08-05
    公开日:1990-10-23
    发明作者:Беннион Ян；Каш Роузмэри；Гроувз-Нирби Кристофер-Джон
    申请人:Плесси Оверсиз Лимитед (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to optical logic elements, in particular, to multi-stable non-linear resonant devices with long-term information storage.
    . The aim of the invention is to enhance the functionality by picking up at least two thermally stable conditions of the device.
    Figure 1 shows the functional optical design of the device; 2 and 3 are graphs of the dependencies of the transmission coefficient of a resonance.
    cavities with a photochromic medium with two stable states and many stable states, respectively.
    The optical resonant device (Fig. 1) contains a resonant cavity, made in the form of a Fabry-Perot 1 resonator, which consists of translucent mirrors 2 and 3, a photochromic medium 4, deposited in the form of a layer on a transparent substrate. The optical axis 5 of the first luminous flux (sources are not shown), the wavelength of which corresponds to the discoloration wavelength.
    four

    s
    A photochromic medium 4 parallel to the optical axis 6 of the Fabry– Per resonator is 1. The wavelength of the decolorizing light flux is equal to the length of the resonance wavelength of the Fabry – Perot resonator 1. Detector 7 is optically coupled to the output of the source of decolorizing light flux through the translucent mirror 8. associated with the output of the Fabry-Perot cavity 1. The optical axis 10 of the second luminous flux intersects with the optical axis 5 of the first luminous flux in the volume of the photochromic medium 4. The wavelength of the second luminous flux corresponds to staining waves of the photochromic medium 4.
    The portions of curves 11-13 (Fig. 2) and 14, 15 (Fig. 3) describe the dependence of the transmission coefficient of the resonant cavity on the ratio of the forces of the decolorizing and coloring light fluxes.
    The device works as follows.
    For the case of two stable states of the device (Fig. 2) with a colored initial state of the photochromic medium (low ratio of the decolorizing light flux to the coloring light flux), the transmittance of the photochromic medium 4 is determined by the intersection of direct AA with a portion of the curve 11. With increasing the intensity of the decolorizing light flux relative to the strength of the coloring light flux The first of these light streams increases with a constant strength of the second stream (close to zero). When the transmittance, corresponding to point C of curve 12, is reached, the photochromic medium turns into a bleached state.
    When reducing the ratio of the forces of decolorizing and coloring light flux, the transmission coefficient of the resonant cavity will decrease in accordance with the curve 13 section. In this case, the power of the coloring light flux in this case increases when the power of the decolorizing light flux is near zero.
    The device has two stable states. The first of these is determined by the intersection of direct AA with the site
    five
    0
    five
    0
    35
    40
    45
    50
    55
    curve 11. Another stable state is determined by the intersection of direct AA with a portion of curve 13.
    The logical state of the device is determined by comparing the readings of the detectors 7 and 9 with a normal ratio of the forces of bleaching to the color and color of the light fluxes, respectively. direct AA (in FIG. 2).
    For the case of many stable device states (Fig. 3), the first pair of stable-state states is located at the intersection of direct YY with curves 14 and 15, and the second pair of stable states is located at the intersection of direct ZZ curves 14 and 15. For this case, the change in the optical length of the resonant cavity with a change in the state of the photochromic medium 4 is larger than in the case of two stable states of the device. D / 1 cases of many stable states The thickness of the photochromic medium 4 (or the concentration of color centers in the latter) is chosen more than for the case of two stable states.
    A photochromic medium, having a large thermal relaxation time constant, makes it possible to obtain thermally stable states of the device that are stable. Even when removing the control light fluxes. The information may be stored for a long time without constant illumination.
    To obtain a logical device AND discoloration of the acres, the luminous flux (for the section of curve 11) or the coloring luminous flux (for the section of curve 13) is obtained by adding together the luminous fluxes from two sources. Individually, the intensity of the light flux from each source is chosen insufficient for switching the device, but their sum switches the latter.
    The high resolution of photochromic media allows you to memorize a large amount of logical information in the proposed device.
    Obtaining many logical bits can be obtained by using the entire area of the photochromic medium. The first particular variant — the sources of the first and second light fluxes are optically coupled to the resonant cavity with the possibility of moving the optical axis of the bleaching light flux parallel to the optical
    axis of the resonant cavity. The optical axis of the coloring light flux in this case moves synchronously with the movement of the optical axis of the decolorizing light flux so that the indicated axes in the volume of the photochromic medium are constantly intersected. The second particular variant - the resonant cavity is made with the possibility of moving the last perpendicular to the optical axis of the first luminous flux. .
    Exemplary photochromic media are Ex-2,5-dimethyl-3-furilatnlidene (isopropylidene) succinanide in toluene or Ex-2,5-dimethyl-3-furyl ethylidene (admentide en) succinanhydride in toluene.
    权利要求:
    Claims (5)
    [1]
    1. An optical resonant device containing a resonant cavity with a nonlinear medium, at least one source of the first luminous flux, the optical axis of which is essentially parallel to the optical axis of the resonant cavity, at least od1H a second source of the luminous flux, the optical axis of which intersects with the optical axis of the first the luminous flux in the volume of the nonlinear medium, characterized in that, in order to extend the functionality by obtaining
    At least two thermally stable states of the device, the nonlinear medium is made photochromic, with the wavelength of the first light flux equal to the wavelength of the resonance cavity and corresponds to the wavelength of the discoloration of the photochromic medium, and the wavelength of the second light flux of the photochromic medium.
    [2]
    2. A device according to claim 1, characterized in that the resonant cavity is made in the whole area of the Fabry-Perot resonator.
    [3]
    3. A device according to Claims 1 and 2, characterized in that the sources of the first and second light fluxes are optically coupled to the resonance cavity with the possibility of moving the optical axis of the first light flux parallel to the optical axis of the resonant cavity.
    [4]
    4. The device according to Claims 1 and 2, t - 5, is characterized by the fact that the resonant cavity is made with the possibility of moving the latter perpendicular to the optical axis of the first light flux.
    0
    [5]
    5. The device according to claim 1-4, the environment is made
    T1SH-3-furyl ethyl n (isopr on the n) - succinic anhydride in toluene or in Vnde
    Ex-2,5-dimethyl-3-furylethylidene (adsilidene) succinic anhydride in toluene.
    five
    0
    that photochromic in the form of Ex-2,5-dime
    1
    11602406
    Oh l and
    Fi9.2
    15
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3365678A|1964-01-28|1968-01-23|Corning Glass Works|Laser employing photochromic glass as a q-spoiling medium|
    US3476459A|1965-10-23|1969-11-04|Sperry Rand Corp|Optical logic system with a screen made of photochromic material|
    FR1592114A|1968-05-10|1970-05-11|
    US3696344A|1970-02-19|1972-10-03|Energy Conversion Devices Inc|Optical mass memory employing amorphous thin films|
    SE8200557L|1982-02-01|1983-08-02|Asea Ab|DEVICE FOR LATERAL INFORMATION TRANSFER IN OPTICAL ORIENTED MEDIA|
    CA1248381A|1982-10-01|1989-01-10|Anis Husain|Selection and application of highly nonlinear optical media|
    US4630898A|1983-10-14|1986-12-23|Jewell Jack L|Etalon optical logic gate apparatus and method|
    US4558923A|1983-12-22|1985-12-17|The United States Of America As Represented By The Secretary Of The Navy|Picosecond bistable optical switch using two-photon transitions|
    US4573767A|1984-05-31|1986-03-04|The United States Of America As Represented By The Secretary Of The Air Force|Optical flip-flop system|
    GB8614972D0|1986-06-19|1986-07-23|Plessey Co Plc|Optical devices|GB2197495B|1986-10-24|1990-08-15|Plessey Co Plc|Bistable optical device|
    FR2665270B1|1990-07-27|1994-05-13|Etat Francais Cnet|LIGHT SPACE MODULATOR DEVICE AND HIGH DYNAMIC CONOSCOPIC HOLOGRAPHY SYSTEM COMPRISING SUCH A MODULATOR DEVICE.|
    US5618654A|1992-12-24|1997-04-08|Hitachi, Ltd.|Photo-controlled spatial light modulator|
    DE19831777A1|1998-07-15|2000-02-03|Norbert Hampp|Light modulator with a photochromic layer|
    US8567677B1|2006-11-13|2013-10-29|Hrl Laboratories, Llc|Optical identification system and method|
    US8711896B2|2010-01-05|2014-04-29|Kla-Tencor Corporation|Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB8519711|1985-08-06|
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