| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | ACTIVE OPTICAL LIMITING SEMICONDUCTOR DEVICE AND METHODS | US12258664 | 2008-10-27 | US20100102204A1 | 2010-04-29 | Robert C. Hoffman |
| An optical switching system comprising an embodiment with a high pass filter operable to eliminate a portion of frequencies present in an image and an optical device operative to receive the spectrally modified image from the high pass filter, alternatively amplify the spectrally modified image, and propagate at least those frequency components in the spectrally modified image exhibiting a frequency less than an absorption frequency of the optical switching device when the optical switching device is active. Alternatively, the optical switching system may transmit an image only when the system is active. The optical switching system may, for example, comprise superluminescent light emitting diodes which may be, for example, formed in the shape of an inverted truncated prism. For human viewing purposes, the operative transmission ranges may closely coincide with the maximum sensitivity of the photopic response of the corresponding red, blue and green cones in human eyes. | ||||||
| 62 | RESETTABLE OPTICAL FUSE | US12525105 | 2008-01-31 | US20100061680A1 | 2010-03-11 | Ram Oron; Ariela Donval; Boaz Nemet; Doron Nevo; Moshe Oron |
| A resettable optical energy switching device comprises a waveguide forming an optical path between an input end and an output end, and an optical energy diverting material located in said optical path for diverting optical energy propagation away from said output end when said optical energy exceeds a predetermined threshold. The optical energy diverting material does not divert optical energy propagation away from the output end when the optical energy propagation drops below the predetermined threshold, and thus propagation of optical energy to the output end is automatically resumed when the optical energy drops below the predetermined threshold. In one implementation, the optical energy diverting material comprises a light-absorbing material having an index of refraction that decreases as light is absorbed by the material. | ||||||
| 63 | Systems and methods for limiting power using photo-induced anisotropy | US10877777 | 2004-06-25 | US20050135454A1 | 2005-06-23 | Pengfei Wu; Reji Philip; D.V.G. L.N. Rao |
| Preferred embodiments of the present invention are directed at limiting power and controlling an output intensity of an optical system using photo-induced anisotropic materials. In a preferred embodiment, an azobenzene polymer film is used. The embodiments in accordance with the present invention include a cross-polarization system to provide clamping of the output intensity. A system for limiting power in accordance with a preferred embodiment of the present invention, includes a light source that provides an input light beam along a first optical path, a first polarizing element having a first polarization state positioned in the first optical path, a second polarizing element positioned in the first optical path having a second polarization state substantially orthogonal to the first polarization state, a sample having a photo-induced anisotropic material positioned in the first optical path, and a polarizer positioned in a second optical path at an angle of approximately 45 degrees to that of the input beam wherein an excitation beam provided in the second optical path spatially overlaps the input beam on the sample, and an output beam that is generated has a limited transmission value at high intensity. | ||||||
| 64 | Optical energy switching device and method | US10507575 | 2003-03-13 | US20050111782A1 | 2005-05-26 | Ariela Donval; Doron Nevo; Moshe Oron; Ram Oron |
| An optical power or energy-switching device, comprising an optical waveguide having an input section and an output section, the two sections forming a pair of opposed surfaces extending transversely through the axes of said waveguide sections, and a thin, substantially transparent layer of electrically conductive material disposed between said opposed surfaces, said layer of conductive material forming a plasma when exposed to optical signals propagating within said optical waveguide with an optical power level above a predetermined threshold, said plasma damaging said opposed surfaces sufficiently to render said surfaces substantially opaque to light propagating within said optical waveguide so as to prevent the transmission of such light. | ||||||
| 65 | Constant output light attenuator and constant output light attenuating method | US10380833 | 2001-09-18 | US06879436B2 | 2005-04-12 | Masanori Oto; Yuuichi Morishita; Haruhito Noro |
| In a light attenuator or its attenuating method, a nonlinear optical material and an aperture section are placed respectively on a same optical axis, between a receiving optical finder and a sending optical fiber. The nonlinear optical material receives and refracts an input light outputted from the receiving optical fiber. The aperture section has an aperture, receives the light having passed through the nonlinear optical material, and outputs constant output light to the sending optical fiber by only allowing only a part of the light to be outputted from the aperture. | ||||||
| 66 | Methods and apparatuses for selectively limiting undesired radiation | US10703136 | 2003-11-06 | US20040188617A1 | 2004-09-30 | John W. Devitt; Mark E. Greiner; Jeffrey J. Voelker; David R. Wade |
| An apparatus for selectively limiting undesired radiation from a scene is provided. One embodiment includes an optic that is operative to attenuate radiation by selectively losing transparency in response to radiation within a first wavelength band from a source, wherein the loss of transparency affects the passage through the optic of radiation within a second wavelength band from that source. The optic can be positioned between a sensor and the scene such that the sensor is configured to receive radiation from the scene through the optic. Also disclosed is an optical limiter which in one embodiment includes a plurality of such optics, wherein the optical limiter is configured to facilitate transmission of light corresponding to a scene, and wherein each optic is configured to receive a respective portion of the light corresponding to a respective portion of the scene. A light detector assembly and a method of limiting light energy are further disclosed. | ||||||
| 67 | Constant output light attenuator and constant output light attenuating method | US10380833 | 2003-03-19 | US20040033045A1 | 2004-02-19 | Masanori Oto; Yuuichi Morishita; Haruhito Noro |
| In a light attenuator or its attenuating method, a nonlinear optical material and an aperture section are placed respectively on a same optical axis, between a receiving optical fiber and a sending optical fiber. The nonlinear optical material receives and refracts an input light outputted from the receiving optical fiber. The aperture section has an aperture, receives the light having passed through the nonlinear optical material, and outputs constant output light to the sending optical fiber by only allowing a part of the light to be outputted from the aperture. Then, for obtaining the wishful output light with constant strength no depending upon the input light, these parameters of the quadratic nonlinear refractive index n2 and the thickness t of the nonlinear optical material; the distance L between nonlinear optical material and aperture section; and the diameter null of the aperture, are set most appropriately. | ||||||
| 68 | Reversible thermochromic optical limiter | US07871930 | 1992-04-21 | US06652778B1 | 2003-11-25 | Allen J. Twarowski |
| A reversible thermochromic optical limiter incorporates a thermochromic material, such as a spiropyran, that has molecules present in one of two states. At ambient temperatures the material is transparent to light. Incident laser radiation causes localized heating that turns the material to a colored state, effectively limiting transmission of the laser radiation. A laser protection device may comprise an optical focusing assembly, a nonlinear thermochromic medium, and a collimating assembly. A far field image having an intrusive laser beam, is focused through the thermochromic medium. The laser beam is focused to a small volume, causing localized heating, a large increase in optical density, and absorption of the laser light. The thermochromic medium has a fast response time over a broad wavelength band and returns to its transparent state when the laser beam subsides. The far field image is focused to a much larger volume so that it does not cause significant heating or change in optical density. The image passes through the device with a dark spot in the far field where the laser originated. | ||||||
| 69 | Polymer 1D photonic crystals | US10391296 | 2003-03-19 | US20030189758A1 | 2003-10-09 | Eric Baer; P. Anne Hiltner; James S. Shirk |
| A multilayer nonlinear dielectric optical structure is formed by coextruding at least two polymeric materials, components (a) and (b), using a multiplying element; the structure contains a plurality of alternating layers (A) and (B) represented by formula (AB)x, where xnull2n, and n is the number of multiplying elements; at least one of the components (a) and (b) exhibits nonlinear optical response. These structures perform a variety of nonlinear optical functions including all-optical switching and passive optical limiting. | ||||||
| 70 | Polymer 1D photonic crystals | US09794492 | 2001-02-28 | US06582807B2 | 2003-06-24 | Eric Baer; P. Anne Hiltner; James S. Shirk |
| A multilayer nonlinear dielectric optical structure is formed by coextruding at least two polymeric materials, components (a) and (b), using a multiplying element; the structure contains a plurality of alternating layers (A) and (B) represented by formula (AB)x, where x=2n, and n is the number of multiplying elements; at least one of the components (a) and (b) exhibits nonlinear optical response. These structures perform a variety of nonlinear optical functions including all-optical switching and passive optical limiting. | ||||||
| 71 | Optical device having nonmonotonic transfer function and applications using same | US10068472 | 2002-02-08 | US20020195208A1 | 2002-12-26 | Erik V. Johnson; Edward H. Sargent; Lukasz Brzozowski |
| An entirely passive all-optical device, referred to as an optical hard limiter, consists of alternating layers of materials having oppositely signed Kerr coefficients and substantially different linear indices of refraction, wherein the higher linear index material has the negative Kerr coefficient and the lower linear index material has the positive Kerr coefficient. The optical device has two distinct transmittance curves. Various optical devices and systems can be built from such optical hard limiters. | ||||||
| 72 | Optical power limiting material | US09746475 | 2000-12-21 | US20020024752A1 | 2002-02-28 | Masanori Ando; Kenji Kamada; Kohei Kadono; Koji Ohta; Keiko Tawa; Takeyuki Tanaka |
| A main object of the present invention is to provide a novel optical power limiting material of high performance being less susceptible to damages caused by heat occurring when an intensified laser beam is irradiated, having reversible characteristic and exhibiting a stable optical power limiting effect; production of the optical power limiting is simple and economical. The optical power limiting material of the present invention comprises a transparent substrate and an oxide(s) of at least one metal selected from the group consisting of of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Nb, Mo, Ru, In, Sn, Sb, Ta, W, Re, Os, Ir and Bi. | ||||||
| 73 | Polymer 1D photonic crystals | US09794492 | 2001-02-28 | US20010043398A1 | 2001-11-22 | Eric Baer; P. Anne Hiltner; James S. Shirk |
| A multilayer nonlinear dielectric optical structure is formed by coextruding at least two polymeric materials, components (a) and (b), using a multiplying element; the structure contains a plurality of alternating layers (A) and (B) represented by formula (AB)x, where xnull2n, and n is the number of multiplying elements; at least one of the components (a) and (b) exhibits nonlinear optical response. These structures perform a variety of nonlinear optical functions including all-optical switching and passive optical limiting. | ||||||
| 74 | Illumination tailoring system using photochromic filter | US298643 | 1994-08-31 | US5614990A | 1997-03-25 | James A. Bruce; Joseph Gortych; Michael S. Hibbs |
| Photochromic glass is situated between a light source for exposing resist coated on a wafer and the wafer. The photochromic glass is activated by a wavelength different from that which activates the resist. An array of individual light sources, each of varying intensity, provide activation light to the photochromic glass. A CCD array temporarily in the imaging plane measures light intensity distribution. A controller varies the individual light source array intensities to activate the photochromic glass to varying degrees to produce a desired effect at the imaging plane. | ||||||
| 75 | ANTI-DAZZLE IMAGING CAMERA AND METHOD | US15150781 | 2016-05-10 | US20170329202A1 | 2017-11-16 | Mitchell B. Haeri |
| An anti-dazzle imaging camera is provided that includes a photorefractive crystal that is wavelength-agnostic. The photorefractive crystal is configured to receive an optical beam. When the optical beam includes no laser, the photorefractive crystal is configured to pass the optical beam unchanged to an imaging detector. When the optical beam includes a laser, the photorefractive crystal is configured to attenuate the laser to generate a modified optical beam and to pass the modified optical beam to the imaging detector. | ||||||
| 76 | BROADBAND GRAPHENE-BASED OPTICAL LIMITER FOR THE PROTECTION OF BACKSIDE ILLUMINATED CMOS DETECTORS | US15176519 | 2016-06-08 | US20160315205A1 | 2016-10-27 | Michael Ushinsky; Mitchell Haeri |
| An optical device may include a sacrificial limiter filter including at least one layer of graphene disposed on a substrate. The at least one layer of graphene may be configured to absorb and scatter at least a portion of electromagnetic radiation incident on the at least one layer of graphene. | ||||||
| 77 | Sacrificial limiter filter | US13563081 | 2012-07-31 | US09463977B2 | 2016-10-11 | Michael Ushinsky; Mitchell Haeri |
| A sacrificial limiter filter may include a substrate and a metal nano-coating and/or a polymer/carbon allotrope coating. The sacrificial limited filter may transmit optical radiation having desired frequencies and/or intensities while blocking optical radiation having undesired frequencies and/or intensities. | ||||||
| 78 | Islands-in-sea type photorefractive polymer composite, and photorefractive device and optical device including the same | US14011077 | 2013-08-27 | US09436060B2 | 2016-09-06 | Chil-sung Choi; Kyoung-seok Pyun |
| Provided are an islands-in-sea type photorefractive polymer composite, and a photorefractive device and an optical device including the same. The islands-in-sea type photorefractive polymer composite includes at least a photoconductive polymer matrix, a nonlinear optical chromophore, and a plasticizer, as a sea component, and includes at least a photocharge generator as an island component. | ||||||
| 79 | Active optical limiting semiconductor device and method with active region transparent to light becoming opaque when not biased | US12258664 | 2008-10-27 | US09051177B2 | 2015-06-09 | Robert C. Hoffman |
| An optical switching system comprising an embodiment with a high pass filter operable to eliminate a portion of frequencies present in an image and an optical device operative to receive the spectrally modified image from the high pass filter, alternatively amplify the spectrally modified image, and propagate at least those frequency components in the spectrally modified image exhibiting a frequency less than an absorption frequency of the optical switching device when the optical switching device is active. Alternatively, the optical switching system may transmit an image only when the system is active. The optical switching system may, for example, comprise superluminescent light emitting diodes which may be, for example, formed in the shape of an inverted truncated prism. For human viewing purposes, the operative transmission ranges may closely coincide with the maximum sensitivity of the photopic response of the corresponding red, blue and green cones in human eyes. | ||||||
| 80 | Device and method for reducing amplitude noise of a light radiation | US13942569 | 2013-07-15 | US09024247B2 | 2015-05-05 | Eckhard Zanger |
| The invention relates to a device for reducing amplitude noise of a light radiation, comprising a first birefringent crystal, which has a first length along a direction of light propagation as well as a first optical axis; a polarization device; a light sensitive element, arranged in such a way that at least a part of a beam of light radiating through the first crystal and the polarization device when the device is in operation strikes the light sensitive element; and a control appliance which stands in operative connection with the first crystal and which is provided and arranged for using a signal generated by the light sensitive element as input variable and for applying a voltage signal as output signal to the first crystal to compensate for the amplitude noise. For the temperature control of the first crystal a temperature control appliance is provided which stands in operative connection with the control appliance and which is provided and arranged for using the voltage signal of the control appliance as input variable and for setting the temperature of the first crystal depending on the input variable of the temperature control appliance. | ||||||
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