159results about How to "Change the refractive index" patented technology

An optical thin film can have a refractive index variation along a dimension that is perpendicular to its thickness. Two areas that have equal physical thicknesses can have different optical thicknesses. Including the thin film as a layer in a thin film optical filter can provide a corresponding variation in the filter's spectral properties. Dosing an optical thin film with ultraviolet light can cause the refractive index variation. Subjecting the film to hydrogen can increase the refractive index's response to the dose of light. Dosing a region of a thin film optical filter with ultraviolet light can change the spectral properties of the region, for example shifting an out-of-specification optical filter into specification thereby increasing manufacturing yield. An agent can promote the film's response to the dose.

The invention provides in one form a macromonomer comprising a polysiloxane copolymer having a backbone structure derived from siloxane monomer units that are substituted or unsubstituted arylsiloxanes, arylalkylsiloxanes, alky(alkyl)siloxanes of the general formula —R1R2SiO— and wherein the terminal groups of the copolymer backbone include crosslinkable groups and wherein pendent from the backbone are at least two crosslinkable groups. The macromonomer may be cured in vivo by ultraviolet or visible light. The invention includes intraocular lenses formed by such macromonomers.

The invention provides an optical fiber F-P multifunctional sensor based on a microporous optical reflection diaphragm. The optical fiber F-P multifunctional sensor based on the microporous optical reflection diaphragm is characterized in that the design of an F-P cavity structure formed by sequentially connecting a single-die optical fiber, an optical capillary tube and the microporous optical reflection diaphragm and a special microporous optical reflection diaphragm structure is adopted to develop a built-in optical fiber F-P multifunctional sensor which can highly sensitively detecting liquid refractive index, air humidity and ultrasound under common air pressure and external high pressure conditions. The sensor has a micro size, is simple in structure, integrated, high in sensitivity, fast to respond, high in resistance to electromagnetic interference, applicable to the fields of environmental monitoring, and biochemical detection and ultrasonic detection, has a good market prospect, and is high in market value.

The invention provides in one form a macromonomer comprising a polysiloxane copolymer having a backbone structure derived from siloxane monomer units that are substituted or unsubstituted arylsiloxanes, arylalkylsiloxanes, alky(alkyl)siloxanes of the general formula —R1R2SiO— and wherein the terminal groups of the copolymer backbone include crosslinkable groups and wherein pendent from the backbone are at least two crosslinkable groups. The macromonomer may be cured in vivo by ultraviolet or visible light. The invention includes intraocular lenses formed by such macromonomers.

The invention relates to a laser system including a nonlinear crystal having a first length portion and a second length portion. The nonlinear crystal disposed to receive input light from the laser for converting the input light into frequency converted light; wherein the nonlinear crystal is configured so that the first length portion of the nonlinear crystal is phase matching for the input light and the frequency converted light, and the second length portion of the nonlinear crystal is phase mismatching for the input light and the frequency converted light. Phase mismatching means may include a temperature controlling board, a clamp, or electrodes.

The invention discloses a narrow-band fiber laser for mixed medium whisper gallery mode microcavity full-optical tuning. The fiber laser comprises a semiconductor laser pump source, a wavelength division multiplexer, a gain fiber, a fiber isolator, an optical coupler, a polarization controller and a tapering fiber coupling mixed medium microcavity, wherein the units are connected end to end in a fiber coupling manner to form a fiber resonant cavity in a closed manner. The tapering fiber coupling mixed medium microcavity is taken as a mode selection unit in the fiber resonant cavity, light is coupled into the microcavity through one end of a tapering fiber, total reflection transmission is carried out on each end face to form a whisper gallery resonance mode, and the light is returned to the fiber resonant cavity through the other end of the tapering fiber. The mixed medium microcavity is composed of two or more than two layers of media, namely one or more layers of medium films with high index of refraction, great thermo-optical coefficient and high light transmissivity are wrapped on the inner layer medium surface of the microcavity. The laser has the characteristics of large wavelength coverage full-optical tenability, compact strucutre, good monochromaticity and the like.

The invention relates to devices having periodic refractive index modulation structures and fabrication methods for the devices using a laser means. By focusing a pulsed laser beam into a transparent material substrate, a path of laser modified volumes can be formed with modified refractive index compared with the unprocessed material. By selecting appropriate laser parameters and relative scan speed, the laser modified path defines an optical waveguide. Separation distance of the individual modified volumes define a periodic modification pattern along the waveguide path, so that the waveguide structures also exhibit grating responses, for example, as spectral filters, Bragg reflectors, grating couplers, grating sensors, or other devices. This method of direct laser fabrication enables one-step fabrication and integration of periodic or aperiodic refractive-index modulation devices together with optical waveguiding properties to enable low-cost, multifunctional 1D, 2D or 3D optical circuit fabrication for simple and complex applications.

An optical switch includes a microresonator comprising a plurality of nanoparticles. The microresonator is configured to receive signal light having a signal wavelength and to receive a pump pulse having a pump wavelength. At least a portion of the microresonator is responsive to the pump pulse by undergoing a refractive index change at the signal wavelength.

Silicate glasses for storing holographic data and for producing computer-generated holograms, including photo-darkenable-refractive (PDR) and photo-bleachable-refractive (PBR) glasses. In one embodiment, a PBR glass plate contains a photosensitive glass layer of a silver ion-exchanged holographic recording (SIHR) glass, with a base glass composition that has been ion-exchanged in an aqueous ion-exchange solution containing silver ions. The SIHR glass is uniformly darkened with darkening-light radiation, causing a refractive index change in the photosensitive glass layer upon exposure to bleaching-light radiation without any post-exposure steps. In another embodiment, an optical information recording medium includes a PDR glass plate containing SIHR glass optimized for multiplex recording and for reproducing information, which utilizes holography with darkening-light radiation as recording beams. In still another embodiment, an optical information recording medium includes a PBR glass plate containing SIHR glass optimized for multiplex recording and for reproducing information, which utilizes holography with bleaching-light radiation as recording beams.

The present invention features use of evanescent field sensing to detect or evaluate unpurified, unlabeled analytes in raw samples. Capture molecules capable of binding to an analyte of interest can be immobilized to a sensing surface of an evanescent field sensor. The interaction between the analyte of interest in a raw sample and the immobilized capture molecules alters the refractive index at the sensing surface, thereby producing a detectable signal in the reflected light from the surface. Raw samples amenable to the present invention include, but are not limited to, cell lysates, tissue extracts, bodily fluid, or biologically-derived samples. Evanescent field sensors suitable for the present invention include, but are not limited to, grating-coupled waveguides.

A high-power, tunable and narrow linewidth external cavity semiconductor laser belongs to the technical field of a semiconductor laser and aims to solve the problem that the comprehensive requirements such as mode characteristic, beam quality, linewidth, coherence and tunability of a single laser are difficult to be met. The high-power, tunable and narrow linewidth external cavity semiconductor laser is formed by directly coupling a gain chip, a tunable external cavity and an inclined power amplifier with a curved waveguide through an end surface, wherein the gain chip is used for achieving laser output of single-mode wide spectrum; the tunable external cavity adopts a silicon on insulator (SOI) material; the linewidth is narrowed by increasing cavity length and a quality factor Q of a laser resonant cavity; the tunability is achieved by the adoption of refractive index of a thermal modulation material; and by the arrangement of the inclined power amplifier with curved waveguide, laser output with high power and high beam quality is achieved under ensuring the stability of the gain chip and the tunable external cavity. By the high-power, tunable and narrow linewidth external cavity semiconductor laser, a novel semiconductor laser integrating a single mode, high power, high beam quality, narrow linewidth, high coherence, tunable wavelength and the like is achieved, and the high-power, tunable and narrow linewidth external cavity semiconductor laser has important application prospect in the fields such as space laser communication and laser radar.

The invention relates to a high-sensitivity resonant optic gyro, and particularly relates to a double-resonant cavity resonant optic gyro which comprises an isolation collimation chip tunable light source Laser, a first coupler C1, a multifunctional integrated optic modulator, a third coupler C3, a second coupler C2, a fourth coupler C4, a main resonant cavity, a first photoelectric detector PD1, a first lock-in amplifier LIA1, a second photoelectric detector PD2, a second lock-in amplifier LIA2, and a feedback control circuit FBC, and also comprises a circular auxiliary resonant cavity with an ohmic contact disposed at the central position, a temperature control module and a fifth coupler C5; an output port is disposed at a position opposite to an input port on the main resonant cavity; an input end of the fifth coupler C5 contacts the output port of the main resonant cavity; an output end of the fifth coupler C5 contacts an input port of the auxiliary resonant cavity; the temperature control module is connected with the ohmic contact through wires made by MEMS technology; and the invention solves the problem of low sensitivity of optic gyros.

The embodiment of the application provides a scanning device and a laser radar. The scanning device comprises a light source, a polarizer, a liquid crystal structure and an electrical structure; the light source emits a laser beam to the liquid crystal structure; the liquid crystal structure receives the laser beam, and reflects the laser beam through a reflecting plane of the liquid crystal structure, the reflected laser beam forms a light spot on a tested object plane, and the liquid crystal structure is located in an electric field. When the laser radar with the scanning device is used forperforming scanning measurement on to-be-tested object plane, the electrical structure forms the electric field by applying the voltage in the preset rule. on the liquid crystal structure; since the liquid crystal structure has a certain mobility, an internal molecule of the liquid crystal structure can produce corresponding deflection when the voltage is applied to the liquid crystal structure, the refractive rate of the liquid crystal structure reflecting plane is changed, thereby changing an exit direction of the laser beam after passing through the reflecting plane, and then changing the location of the light spot on the tested object plane, and realizing the scanning on the tested object plane. The device is higher in precision and has measurement repeatability, control flexibility and stability.

The invention provides a display panel, a graphical structure is arranged in a film layer of the display panel, the display panel is at least provided with a first position and a second position different from the first position, and the first position and the second position meet preset conditions. As the film layers passing through the first position and the second position meet the corresponding relation, the phase difference is small after the light is emitted from the display panel through the two paths. Phase difference generated after light of the same phase passes through the display panel is one of the important reasons of diffraction. According to the invention, after the light with the same phase penetrates through the display panel through two paths, the phase difference is within a preset range, the diffraction phenomenon caused by the phase difference is reduced, the definition of an image sensed by a camera behind the display panel is improved, a clear and real image canbe obtained by a photosensitive element behind the display panel, and full-screen display is realized.

The invention discloses a liquid crystal optical waveguide and laser radar. The liquid crystal optical waveguide comprises a liquid crystal assembly, a waveguide core, a cladding layer and a first conductive film. When the first conductive film is not connected with a first electrode, the waveguide core is in a mode guiding mode, and therefore, when the laser beams enter the waveguide core, the laser beams can carry out total reflection propagation in the waveguide core. Due to the fact that the first conductive film is arranged on one side of the liquid crystal assembly, when the first conductive film is connected with the first electrode, the liquid crystal assembly is in an electric field, so that the liquid crystal molecules can be re-ordered under the action of the electric field, andthe refractive index of the liquid crystal assembly is changed, and at the moment, the waveguide core is in a radiation mode state. When the laser beams are emitted into the waveguide core, the laserbeams can be refracted into the liquid crystal assembly, and the original laser beams can be deflected under the action of the liquid crystal molecules, so that the laser beams can be emitted at different angles, and therefore, the laser beams can complete scanning of the plane direction of the vertical waveguide core.

The invention discloses a method for preparing a gain medium of a polymer optical waveguide amplifier by copolymerizing rare-earth nanoparticles and monomers, and belongs to the technical field of preparation of polymer optical waveguide devices. The method specifically comprises the following steps: preparing the rare-earth nanoparticles doped with sensitizer ions and luminous central ions, wherein the luminous central ions can emit light with the wavelength of signal light, so that the gain of the signal light is realized; modifying the surfaces of the rare-earth nanoparticles with polymeric active groups with a chemical method, and obtaining nanoparticles capable of being copolymerized with the polymer monomers; copolymerizing the rare-earth nanoparticles with the polymeric active groups and the polymer monomers, chaining the nanoparticles to a polymer molecular chain through covalent bonds, and preparing composite polymer; taking the composite polymer as the gain medium for preparing the optical waveguide amplifier, and the like. The composite polymer, namely the gain medium, prepared with the method is utilized for preparing the optical waveguide amplifier, so that the stability and optical property of the optical waveguide amplifier are greatly improved; preparation of a high-stability polymer optical waveguide amplifier can be realized.

Embodiments of the present invention include composite compositions extrusion compounded together comprising a polymer, an amount of nanotubes, and an amount of finely milled carbon fiber having an aspect ratio greater than 1 and less than about 5. The resulting composite materials allow for high carbon loading levels with improved tribological properties including coefficient of friction and wear rates, provides uniform surface resistance with minimal processing sensitivity, retains rheological properties similar to the base resin, and provides isotropic shrink and a reduced coefficient of thermal expansion leading to minimal warp. In general, various articles can be formed that take advantage of the properties of the composite materials incorporating a polymer, carbon nanotubes and finely milled carbon fiber.

The invention provides an optical waveguide structure capable of regulating and controlling the boundary state of a topological photonic crystal. The optical waveguide structure comprises an upper metal plate, a lower metal plate, a waveguide, a background material and a shell, wherein the upper metal plate and the lower metal plate are arranged in the shell, the waveguide is arranged between theupper metal plate and the lower metal plate, the waveguide is composed of a part A and a part B, the part A is formed by arranging unit cells with moderate topological properties, the part B is formedby arranging unit cells with non-moderate topological properties, each unit cell is formed by arranging six cylindrical dielectric cylinders with the radius of 0.12a, the cross section of each unit cell is in a regular hexagon shape, the distance radius from the center of each unit cell to the corresponding cylindrical dielectric cylinder in the unit cell is R, the distance between the centers ofevery two adjacent unit cells is a lattice constant a, the unit cells with the moderate topological property meet a / R=3.36, and the unit cells with the non-moderate topological property meet a / R=2.8.The problems that a traditional waveguide photon is weak in locality and low in transmission efficiency, and the frequency cannot be regulated and controlled are solved.

The invention discloses a silicon-based thermo-optic modulator based on a micro-ring resonant cavity. The silicon-based thermo-optic modulator comprises a silicon substrate and a lower silicon dioxide wrapping layer, wherein the lower silicon dioxide wrapping layer is arranged on the silicon substrate; two straight waveguides and an annular waveguide are arranged on the lower silicon dioxide wrapping layer; the two straight waveguides are respectively used as a main channel waveguide for receiving incident light and a lower channel waveguide for outputting emergent light; the annular waveguide is arranged between the two straight waveguides, and polymers are fed between the annular waveguide and the two straight waveguides; thermal electrodes cover the surfaces of the polymers on two sides. The polymers are fed between the main channel waveguide and the annular waveguide as well as between the annular waveguide and the lower channel waveguide of the micro-ring resonant cavity; furthermore, the heat electrodes respectively cover the polymers; the refraction indexes of the polymer materials are changed by controlling voltage of the two heat electrodes, so that the path of light from the straight waveguides to the annular waveguide is changed; therefore, the resonance wavelength is drifted to modulate a light signal; the silicon-based thermo-optic modulator has the characteristics of simple structure, easiness in manufacturing and high modulation efficiency.

An optical thin film can have a refractive index variation along a dimension that is perpendicular to its thickness. Two areas that have equal physical thicknesses can have different optical thicknesses. Including the thin film as a layer in a thin film optical filter can provide a corresponding variation in the filter's spectral properties. Dosing an optical thin film with ultraviolet light can cause the refractive index variation. Subjecting the film to hydrogen can increase the refractive index's response to the dose of light. Dosing a region of a thin film optical filter with ultraviolet light can change the spectral properties of the region, for example shifting an out-of-specification optical filter into specification thereby increasing manufacturing yield. An agent can promote the film's response to the dose.

The invention relates to the technical field of displaying, and discloses a display panel. The display panel comprises a CF (Colour Filter) substrate, wherein a plurality of pixel points are formed on the front side of the CF substrate; one pixel point comprises a plurality of sub-pixels. The display panel is characterized by comprising a first transparent conductive layer, a second transparent conductive layer, an electrochromic structure and a solid electrolyte, wherein the electrochromic structure is formed by an electrochromic material, and has a certain height; the first transparent conductive layer is formed on the back side of the CF substrate; the electrochromic structure and the solid electrolyte are formed between the first transparent conductive layer and the second transparent conductive layer; the solid electrolyte is formed on the periphery of the electrochromic structure. The invention further provides a display including the display panel and a method for manufacturing the display panel. Through the scheme of the invention, a visual angle can be controlled while the display quality is not influenced, and integration and thinning are facilitated.

The invention provides an intelligent glass window and a preparation method thereof. The glass window comprises a window body, an outer window frame and a charging module. The window body comprises a window sash and dimming glass installed in the window sash in an electric connection mode. The outer window frame is arranged on the outer side of the window sash in a surrounding mode. The charging module comprises a wireless receiver and a wireless transmitter, the wireless receiver is installed on the window sash, the dimming glass is electrically connected to the wireless receiver of the charging module, the wireless transmitter is installed at a preset position of the outer window frame, the preset position is suitable for enabling the wireless transmitter to provide radio signals for the wireless receiver, the wireless transmitter is electrically connected to an external power supply in a controllable mode, and by switching on or switching off the charging module, the dimming glass is made in a transparent state or a semi-transparent state. Thus, switching between the frosted effect and the transparent effect of the dimming glass is rapidly achieved through a wireless control method; besides, it is not needed to reserve wires, and control is more convenient.

The invention discloses a low-refractive-index optical coating material. The optical coating material is prepared from silicon dioxide and an additive, and the additive is selected from one or more of aluminum oxide, magnesium oxide and yttrium oxide.

The invention relates to an electrostatic self-assembly deepening method for a fabric. The method comprises the following steps: (1) preparation of a deepening agent A: weighing polyethylene imine (PEI) and diluting PEI with deionized water through ultrasonic dispersion so as to obtain an aqueous PEI solution with a mass percentage of 0.05 to 0.25%; (2) preparation of a deepening agent B: preparing an aqueous silica dispersion with a mass percentage of 5 to 20% from a nanometer silica sol solution by using deionized water; and (3) color deepening: treating a dyed silk fabric by impregnating the dyed silk fabric in the deepening agent A, then taking the impregnated silk fabric out, cleaning the impregnated silk fabric with deionized water twice to five times, then impregnating the silk fabric in the deepening agent B, and after completion of impregnation, cleaning the silk fabric with deionized water twice to five times, thereby finishing one cycle of assembly. The method provided by the invention employs electrostatic self-assembly technology to construct polymer-based nanometer film structures on different fabrics so as to exert deepening effect on the fabrics.

The present invention relates to a tapered optical fiber temperature sensor and a sensing probe production method thereof. The temperature sensor comprises a tapered optical fiber temperature sensing probe. An input terminal of the tapered optical fiber temperature sensing probe is connected with a light source. An output terminal of the tapered optical fiber temperature sensing probe is connected to a signal processing unit through an optical detector. When a cone zone ambient temperature of the tapered optical fiber temperature sensing probe changes, a cone zone evanescent field changes correspondingly, so that an optical power outputted by the tapered optical fiber temperature sensing probe is changed. The optical detector converts an optical signal outputted by the tapered optical fiber temperature sensing probe into an electric signal and sends the electric signal to the signal processing unit, and temperature information is obtained through voltage conversion. The sensor and the method have the advantages of simple structure and high sensitivity, the sensing probe is easy to manufacture and low in cost, and is suitable for diverse industrial, agricultural, scientific research occasions of oil depot tank group temperature monitoring, power system temperature monitoring, mine tunnel fire monitoring, greenhouse granary temperature monitoring, building structure health monitoring and the like.

The invention belongs to the technical field of stereo display and particularly relates to a 2D / 3D switchable stereo display device which comprises a display panel and a liquid crystal lens arranged on the light outlet side of the display panel. The liquid crystal lens comprises a first substrate, a second substrate, liquid crystal molecules and interstitials, wherein the first substrate and the second substrate are oppositely arranged, and the liquid crystal molecules and the interstitials are arranged between the first substrate and the second substrate. The first substrate is provided with a plurality of first electrodes, every two adjacent first electrodes is at a certain interval, the second substrate is provided with second electrodes, and the 2D / 3D switchable stereo display device further comprises a control module which is used for controlling first voltage exerted between the first substrate and the second substrate. When the 2D / 3D switchable stereo display device is in 2D display, the first voltage generates a first electric field equal in electric field intensity, the first electric field drives the liquid crystal molecules to be deflected, so that the refractivity between the liquid crystal molecules and the interstitials is within a preset range, and the problem that due to the refractivity, light is refracted at the interstitial positions, bright spots or color spots occur at the interstitial positions and viewing effect is affected is solved.

The invention relates to a lithium niobate-based PM-QPSK integrated light modulator and a working method thereof. The lithium niobate-based PM-QPSK integrated light modulator comprises an upper electrode, a lower electrode, a lining and lithium niobate crystals, wherein a polarization demultiplexer, two IQ modulators in parallel and a polarization multiplexer are sequentially etched on the lithium niobate crystals in a light path direction; the upper electrode and the lower electrode are respectively arranged on the upper surface of the lithium niobate crystals and below the lining; the polarization demultiplexer and the polarization multiplexer are respectively a lithium niobate polarization demultiplexer based on MZI and a lithium niobate polarization multiplexer based on MZI. As the lithium niobate-based PM-QPSK integrated light modulator is provided with the lithium niobate polarization demultiplexer and the lithium niobate polarization multiplexer manufactured on a birefrigent effect of lithium niobate, the conventional method that a polarization multiplexer is manufactured on the basis of a silicon substrate is changed, a polarization demultiplexer and a polarization multiplexer based on the silicon substrate and IQ modulators are integrated on the same piece of crystal, and the allowance is far smaller than a silicon substrate process.

The invention belongs to the field of optical fiber surface plasmon resonance (SPR) sensing, and mainly relates to an optical fiber SPR curvature sensor with a direction recognition function and a using and manufacturing method, which can perform curvature measurement, bending direction judgment and multi-point simultaneous measurement based on a wavelength division multiplexing technology throughtwo parameters of resonance wavelength and resonance valley depth. A semi-circular surface SPR sensing film is plated on one side of a plastic cladding optical fiber core, and a plastic cladding anda coating layer are remodeled and restored by using a low-refractive-index coating adhesive outside the plastic cladding optical fiber core; compared with a curvature sensor based on optical fiber interference and a grating mechanism, the optical fiber SPR curvature sensor provided by the invention has the advantages that the structure is novel and stable, the bending performance is high, detection can be realized only by using a broadband incoherent light source and a visible light band spectrograph, and the like; the sensor and the method have good application prospects in the fields of geological environment monitoring of three gorges reservoir area landslides, reservoir banks and the like, building structure health monitoring and the like.

The invention discloses an electric control tunable porous terahertz band gap optical fiber. The substrate of the optical fiber is made of a plastic polymer; a fiber core of the optical fiber is composed of air holes arranged in a triangular lattice manner; the coating layer of the optical fiber is formed by composite air holes arranged in a triangular lattice and honeycomb lattice manner; and a nematic phase liquid crystal which is sensitive to an electric field is filled in the air holes arranged in the triangular lattice manner in the coating layer. With the adoption of the electric control tunable type porous terahertz band gap optical fiber, the direction of liquid crystal molecules is changed by controlling an electric field around the optical fiber, so as to change the refractive index of the liquid crystal, and therefore, the band gap property, the conduction mode, the transmission property and the transmission spectral line of the optical fiber can be controlled, and the functions of tunable filtering, switching and the like of terahertz waves can be realized; and furthermore, most guided mode energy is limited in the air holes of the fiber core, so that the absorption consumption of the substrate material on the guided mode energy can be effectively reduced.