324 results about "Nonlinear optical material" patented technology

An apparatus for providing electrooptic modulation. The apparatus includes electrical contacts, a waveguide coupled between the electrical contacts, and a nonlinear optical material positioned in the slot region. The waveguide includes a first arm and a second arm that are each arranged to define a slot region for confining an optical mode. The slot region has a height, t1, and each of the first arm and the second arm include a strip load region having a height that is less than the height, t1, of the slot region. Each of the first arm and the second arm is configured to provide an electrical signal to the slot region via at least one of the electrical contacts. In one embodiment, the nonlinear optical material includes a χ²-based material. In another embodiment, each of the first arm and the second arm have an “L”-type shape.

Provided are a cyclopentaphenanthrene-based compound and an organoelectroluminescent device employing the same. The cyclopentaphenanthrene-based compound is easy to prepare and excellent in solubility, color purity, color stability, and thermal stability. The cyclopentaphenanthrene-based compound is useful as a material for forming an organic layer, in particular, an emitting layer, in an organoelectroluminescent device, and as an organic dye or an electronic material such as a nonlinear optical material.

A cyclopentaphenanthrene-based compound is easy to prepare and excellent in solubility, color purity, and color stability. The cyclopentaphenanthrene-based compound is useful as a material for forming an organic layer, in particular, an emitting layer, in an organoelectroluminescent device, and as an organic dye or an electronic material such as a nonlinear optical material.

The invention relates to a sulfurized gallium and barium monocrystal as well as a growing method and an infrared nonlinear optical device thereof. A molecular formula of the sulfurized gallium and barium monocrystal is BaGa4S7, the sulfurized gallium and barium monocrystal belongs to the field of rhombic systems, a space group is Pmn21, and a cell parameter is as follows: a=14.755 A, b=6.228 A, c=5.929 A, and alpha=beta=gamma=90 DEG. The nonlinear optical materials are prepared by adopting a crucible decent method to obtain compositions and monocrystals of the same and can be used for manufacturing a secondary harmonic generator, an upper frequency converter, a lower frequency converter and an optical parametric oscillator.

The invention discloses a preparation method of a composite ZnO-mesoporous silica nanomaterial, namely a solvothermal in situ substitution method. The preparation method comprises the following steps of: uniformly mixing silicon-based molecular sieve powder, a ZnO precursor, a doping element and an organic solvent, adding the mixture into a high-pressure reaction kettle, and introducing a shielding gas to the reaction kettle for reaction; filtering the reaction mixture, washing, and drying to obtain dry powder; and heating and calcining the dry powder to obtain the composite ZnO-mesoporous silica nanomaterial. The composite ZnO-mesoporous silica nanomaterial prepared by the preparation method disclosed by the invention has the advantages of uniform ZnO loading, stable properties, excellent optical properties and catalytic properties and strong SHG (second harmonic generation) and TPL (two-photon luminescence) optical properties when used as an excellent catalyst for organic ester synthesis or as a laser nonlinear optical material, and is suitable for being prepared into a purple light-emitting material or a functional polymer additive. The preparation method disclosed by the invention has the advantages of wide and available raw materials, simplicity of operation and advantageous production cost.

An optoelectronic transducer comprises a unipolar, intraband active region and a micro-cavity resonator. The resonator includes a 2D array of essentially equally spaced regions that exhibits resonant modes. Each of the spaced regions has a depth that extends through the active region and has an average refractive index that is different from that of the active region. The refractive index contrast, the spacing of the spaced regions, and the dimensions of the spaced regions are mutually adapted so that the array acts as a micro-cavity resonator and so that at least one frequency of the resonant modes of the array falls within the spectrum of an optoelectronic parameter of the active region (i.e., the gain spectrum where the transducer is a laser; the absorption spectrum where the transducer is a photodetector). In a first embodiment, the transducer is an ISB laser, whereas in a second embodiment it is a unipolar, intraband photodetector. In other embodiments, the laser is a surface-emitting ISB laser and the photodetector is a vertically-illuminated detector. In another embodiment, a nonlinear optical material is optically coupled to the micro-cavity resonator, which in one case allows an ISB laser to exhibit bistable operation.

Provided are a cyclopentaphenanthrene-based compound and an organic EL device using the same. The cyclopentaphenanthrene-based compound is easy to prepare and excellent in solubility, color purity, and color stability. The cyclopentaphenanthrene-based compound is useful as a material for forming an organic layer, in particular, a light-emitting layer in an organic EL device, and as an organic dye or an electronic material such as a nonlinear optical material.

The invention provides a nonlinear optical material based on a metal nanometer cluster array, wherein the material includes a substrate, the metal nanometer cluster array on the substrate, and a polymer, an oxide or a metal-doped oxide wrapping the array. The material can be prepared by the following method: at first, the nanometer microspheres of polystyrene are dissolved in water to prepare a colloid water solution of the nanometer microspheres of polystyrene; the colloid water solution is coated on the substrate; the water on the substrate coated with the colloid water solution is removed to obtain orderly-arrayed colloid crystal membrane lamina with the nanometer microsphere of polystyrene; metal is deposited on the colloid crystal membrane lamina with the nanometer microsphere of polystyrene to obtain the colloid crystal membrane lamina with deposited metal; and the crystal membrane lamina of the colloid crystal membrane lamina with deposited metal is removed to obtain the substrate with the metal nanometer cluster array. The material has large three-nature optical coefficient and ratio of optimum value and is especially suitable for practical application.

The invention relates to an inorganic nonlinear optical material lead iodo-borate crystal, and a preparation method and application thereof, belonging to the field of inorganic chemistry as well as the field of material science. The chemical formula of the lead iodo-borate crystal is Pb2B5O9I, and the molecular weight is 739.35; the lead iodo-borate crystal belongs to an orthorhombic crystal system and a space group Pnn2; and the unit cell parameters are as followings: alpha = 90 DEG, beta = 90 DEG, gamma = 90 DEG, and Z = 4. The lead iodo-borate crystal is synthesized by a one-step self fluxing method, which comprises the following steps: mixing lead raw materials consisting of oxide, lead iodide and boron oxide with self flux consisting of PbO and B2O3 which are 50-150% excess, wherein the molar ratio of of PbO:PbI:B2O3 is 3:1:5; adding the mixture to a vacuum sealed container; insulating heat at 700-900 DEG C for 5-48 hours; and slowly cooling to room temperature at the speed of lower than 10 DEG C/hour to obtain an end product lead iodo-borate crystal. The lead iodo-borate crystal has excellent nonlinear optical performance, and the second harmonic generation (SHG) coefficient of the crystal powder is 1.4 times that of KTP (kalium titanium phosphate).

A multi-channel optical frequency mixer for all-optical signal processing and a method for engineering the same. The multi-channel mixer uses a nonlinear optical material exhibiting an effective nonlinearity d_eff whose spatial distribution is defined by a quasi-phase-matching grating, e.g., a QPM grating. The spatial distribution is defined such that its Fourier transform to the spatial frequency domain defines at least two wavelength channels which are quasi-phase-matched for performing optical frequency mixing. The wavelength channels correspond to dominant Fourier components and the Fourier transform is appropriately adjusted using grating parameters such as grating periods, phase reversal sequences and duty cycles to include an odd or even number of dominant Fourier components. The multi-channel mixer can perform frequency mixing operations such as second harmonic generation (SHG), difference frequency generation (DFG), sum frequency generation (SFG), and parametric amplification.

A method for reducing speckle noise of a monolithic microchip laser with intracavity beam combining and sum frequency mixing is based on time averaging of uncorrelated speckle patterns generated from a large number of independent longitudinal modes and comprises schemes including selection of gain media and nonlinear optical materials to support broadband sum frequency mixing; adoption of gain-conjugated and/or chirped mirrors for flat-top spectra and/or mode phase diversification; multimode laser operation introduced by RF modulation; and multiplication of source modes in frequency mixing process featured with degeneration free and narrowed/uneven intervals. A device and an apparatus for generating low speckle noise red, green, blue lasers adaptable for color display systems are developed based on the inventive method.

The invention belongs to the field of nonlinear optical materials and particularly discloses a weak light frequency upconversion o/w type microemulsion system for triplet state annihilated weak light upconversion. When a medium contains a heavy metal porphyrin derivative as a photosensitizer which forms an upconversion microemulsion with a tri-substituted anthracene derivative as a luminescence reagent, the system is stable, nontoxic and simple to prepare. Particularly importantly, the technology is implemented without isolating air, so that the system has a practical value. Frequency upconversion fluorescence emitted by short waves activated by long waves can be obtained in a weak light field (less than 60mW*cm<-2>), and the upconversion efficiency can reach up to 32.14%. The system can be used for photo-electrochemical hydrogen preparation and has a potential application value in the fields of solar photovoltaic field, solar photocatalytic, environmental photo-chemical technologies and the like.

The invention involves preparation method of three-dimensional network hierarchy photocatalysis materials which crystal phase can be controlled. The method bases on biological template synthesis technology, uses bird eggshell membrane as biological template material, dips the eggshell membrane into titanates prodromal liquid to handling the dip optimization after separating, washing and pretreating the eggshell membrane, then oxygenizes and incandesces it to forming titania nanometer crystal under the action of biological template in original position, then prepares nanometer titania with excellent performance and three-dimensional network hierarchy as photocatalysis material. The prepared photocatalysis material consists of mixing-phase titania crystal grain which grain size is below 20nm, the component percentage of anatase phase and rutile phase can be controlled by adjusting the pH of steeping liquor. The process of the invention is simple, cost is low and the performance of prepared photocatalysis material is stable; it can be used for gas sensor, pressure-active element, nonlinear optical material, solar battery and environmental purification material, it also has good prospect in the electrical, electronic, industrial and civil fields.

A method and a nonlinear frequency mixer employing the method to generate at least one output light from at least one input light with the aid of a quasi-phase-matching (QPM) grating for quasi-phase-matching the input and output light involved in a nonlinear frequency mixing operation such as three-wave mixing, four-wave mixing or other nonlinear operation mediated by a susceptibility of the nonlinear optical material. The QPM grating has a beam-modifying pattern with features for wave front shaping. More specifically, the features shape the wave fronts of the output light by diffraction or phase front shaping to thereby modify its propagation. This modification of propagation can be used to steer, focus, defocusing, split and/or collimate the output light. The features themselves can have various geometric shapes and sizes, even on the order of the wavelength of the output light, and they can include domains exhibiting a nonlinear optical susceptibility χ, such as the second-order susceptibility χ⁽²⁾, domain edges, and/or spacings between such domains.

The invention belongs to the field of nonlinear optical materials, and particularly discloses a hydrogel-based solid-state up-conversion luminescence material and a preparation method thereof.The material can be directly used in atmospheric environment and has quite high stability.The method includes: under excitation of low-power-density green light (532 nm, 60 mW.cm-2), enabling up-conversion hydrogel on a PdTPP/DPA system to obtain blue up-conversion luminescence.When temperature is increased, up-conversion efficiency (phiUC)of the material is in positive correlation with temperature and is up to 12%.A convenient and quick idea is provided for preparing up-conversion luminescence materials, and deoxidization is not needed, so that instability in organic solvents, complexity of organic synthesis methods and unfavorable effect on ecological environment protection are avoided usually, and actual application value is increased greatly.The material has potential application value in photoelectrochemical hydrogen generation and in the fields of solar photovoltaic field, solar photocatalysis, environment photochemical technology and temperature sensors.

The invention relates to an infrared nonlinear optical crystal AB4C5Se12 and a preparation method thereof, belonging to the field of inorganic nonlinear optical materials. The infrared nonlinear optical crystal AB4C5Se12 is synthesized through a high-temperature solid-phase one-step synthesis method. In the synthesized infrared nonlinear optical crystal AB4C5Se12, A is K, Rb or Cs; B is Mn or Cd; C is Ga or In; and the infrared nonlinear optical crystal belongs to a trigonal system, and the space group is R3. Under the excitation action of 2.05mu m laser, the powder frequency-doubling strength of the compound RbCd4In5Se12 is 40 times higher than that of AgGaS2.

A light source apparatus with modulation function has a wavelength conversion module (75) composed of a nonlinear optical material with a structure having a nonlinear constant modulated periodically. It outputs a difference frequency or sum frequency produced by multiplexing pumping light from semiconductor laser light sources (71) and (72) with different wavelengths through a WDM coupler (74) and by launching the multiplexed light into the optical waveguide. The semiconductor laser light source (72) includes a diffraction grating. The semiconductor laser light source (71) includes a section for modulating output light emitted from its semiconductor laser, and is connected to an external FBG (73) which has a reflection band narrower than a resonance wavelength spacing determined by the device length of the semiconductor laser. The FBG (73) is supplied with the modulated output.

The invention relates to an optical parametric oscillator, which comprises a nonlinear optical material (1) with the double-zero dispersion wavelength, a high reflector (2), an output mirror (3), a parametric oscillation optical beam collimator (4), a parametric optical line width compressor (5), a pumped optical coupler (6), a lambda/2 phase retarder (7), a laser power controller (8) and an optical isolator (9). The nonlinear optical material (1) has a double-zero dispersion wavelength and is arranged in a resonant cavity formed by the high reflector and the output mirror. The pumped optical wavelength is in the anomalous dispersion regime of the photonic crystal fiber, thereby ensuring the phase matching conditions and generating the highly efficient four-wave mixing effect. For the parametric oscillation formed by simplifying the four-wave mixing, the wavelengths of the two parametric lights are respectively arranged at the double-zero dispersion wavelength of the photonic crystal optical fiber, thereby realizing the group velocity dispersion compensation of the parametric light, solving the problem of the ultra-short pulse dispersion compensation, and greatly reducing the pumping threshold.

The invention discloses a crystal material. The crystal material is characterized in that a chemical formula of the crystal material is BaCdSnS4; the crystal material belongs to Fdd2 space groups of orthorhombic crystal systems. The crystal material has the advantages that the crystal material can be used as a nonlinear optical crystal, nonlinear effects of the crystal materials are 1-5 times nonlinear effects of commercial AgGaS2, a laser induced damage threshold of the crystal material is 1-8 times a laser induced damage threshold of the commercial AgGaS2, and the crystal material is a novel intermediate and far infrared nonlinear crystal material with a large nonlinear coefficient and the high laser induced damage threshold.

Particular embodiments of the present invention relate generally to semiconductor lasers and wavelength conversion devices and, more particularly, to wavelength conversion devices and methods of fabrication thereof that reduce back reflections of light from the wavelength conversion device to the laser. According to one embodiment of the present invention, a wavelength conversion device comprising a nonlinear optical material is poled with domains comprising randomly varying domain widths defined by an ideal poling period Λ_I plus or minus a disruption value. According to another embodiment, the wavelength conversion device comprises a plurality of sequentially positioned ideal poling domains and one or more non-ideal poling domains. The ideal poling domains comprise a domain width of the ideal poling period Λ_I while the non-ideal poling domains comprise a domain width of the ideal poling period Λ_I plus or minus a discontinuity value.

The invention relates to nonlinear optical crystal plumbum-lanthanum iodate which belongs to a nonlinear optical material and synthesis thereof. The plumbum-lanthanum iodate has a chemical formula of La3Pb3O(IO3)13 and the molecular weight of 3328, belongs to the trigonal system and has a space group of R3c and unit cell parameters that a is 22.234(2), b is 22.234(2), c is 13.702(1)*, Alpha and Beta are respectively 90 degrees, Gamma is 120 degrees, V is 5866(1)*3 and Z is 6. The plumbum-lanthanum iodate (La3Pb3O(IO3)13) is prepared by a hydrothermal method and has good nonlinear optical performance, and the SHG coefficient of plumbum-lanthanum iodate powder is two times of that of KDP and equivalent to that of LBO.