76 results about "Third order nonlinearity" patented technology

An optical frequency comb generator includes a laser device arranged for generating input laser light having a predetermined input light frequency, a dielectric micro-resonator having a cavity exhibiting a third order nonlinearity, so that the micro-resonator is capable of optical parametric generation providing parametrically generated light, and a waveguide optically coupled to the micro-resonator, the waveguide being arranged for in-coupling the input laser light into the micro-resonator and out-coupling the parametrically generated light out of the micro-resonator, wherein the laser device, the waveguide and the micro-resonator being arranged for resonantly in-coupling the laser input light to a mode of the micro-resonator with a minimum power level so that an optical field inside the cavity exceeds a predetermined cascaded parametric oscillation threshold at which the parametrically generated light includes frequencies of frequency sidebands of the input light frequency and of the sidebands thereof.

The invention belongs to a Zn (II) coordination polymer as well as a preparation method and an application thereof. The chemical formula of the Zn (II) coordination polymer is [Zn 12(1,4-NDC )12(TPY )12*2H2O]n, wherein 1,4-NDC is 1,4-naphthalenedicarboxylic acid, TPY is 4-phenyl-2,2':6',2''-terpyridine. The Zn (II) coordination polymer as well as the preparation method and the application thereof have the advantages that the preparation method is simple and easy to operate, the product yield is high, the product can be stable at the temperature of 130 DEG C or lower and has high third-order nonlinear optical reverse saturable absorption performance, the third-order nonlinear susceptibility Chi<3> of a pure material is 6.46*10<-8> esu, and the Zn (II) coordination polymer can be applied to optical limiting and laser protection devices.

The present invention discloses application of a multi-channel optical nonlinearity measurement technology to measure the third-order nonlinear refraction coefficient of a medium. According to the present invention, with numerical simulation, a linear relationship is formed in the range of 0-0.65; in the experiment, the results of a sample to be measured and a standard sample can be directly measured, and by using the linear range, the third-order nonlinear refraction coefficients of a plurality of samples to be measured can be measured through the measuring, such that the complex fitting calculation required by the original single-4f system is avoided; and the experiment results verify that the method of the present invention is correct.

Reconfigurable nonlinear frequency conversion waveguide chip based on Mach-Zehnder interferometer coupled micro-ring, the method is based on the integration of waveguide components of phase-adjustable Mach-Zehnder interferometers (MZI) and micro-ring resonators. The chip is illustrated by FIG. 1. The MZI couples light and photons into and output of the micro-ring resonator and controls the micorings' quality factor thus optimize the nonlinear frequency conversion processes inside the ring by the phase-modulator inside the MZI. The micro-ring resonator enables the nonlinear optical generation of new frequency light beams and quantum light sources based on the second-order or third-order nonlinear optical process. Other optical waveguide components in region I and III of FIG. 1 are linear optical circuits for power splitting of pump beams and post-process of generated light beams or photons.

The invention provides a third-order nonlinear optical material, namely a tetrabutyl ammonium fullerene ball and a synthesizing method thereof, which belongs to the field of functional materials. The prior inorganic and organic nonlinear optical materials have the problems of easy deliquescence, poor thermal stability, complicated preparation and the like respectively. The molecular formula of the tetrabutyl ammonium fullerene ball provided by the invention is (NH4)18[(C16H36N)4]24[Mo132O372(H2O)72(CH3COO)30].ca.7NH4CH3COO.ca.173H2O. In the method, after {Mo132} and tetrabutyl ammonium bromide are dissolved in water respectively according to the mass ratio of 1 to 42, and are adjusted by acetic acid respectively until the pH value is between 3.5 and 4.5, the {Mo132} and the tetrabutyl ammonium bromide are mixed to obtain the tetrabutyl ammonium fullerene ball. The third-order nonlinear optical material has the advantages of uneasy deliquescence, high thermal stability, larger nonlinear absorption and non-linear refraction coefficient, self-defocusing property and simple preparation.

The invention relates to a porphyrin edge covalent fused graphene nonlinear nano hybrid material and preparation thereof. Diamino porphyrin is in parallel bond connection to the GO edge through condensation reaction, and a third-order nonlinear coefficient of an organic-inorganic hybrid material is enhanced through enhanced electron coupling and transmission effect between the diamino porphyrin and the GO edge. According to the invention, amino porphyrin and ortho-diketone at the edge of GO are subjected to a condensation reaction to form a pyrazine ring, the novel edge-fused organic-inorganic covalent functionalized nano-hybrid material is successfully prepared, and the pyrazine ring enhances the conjugation degree and electron coupling and transmission between porphyrin and graphene; and therefore, compared with a traditional material, the prepared material has more enhanced nonlinear optical performance in the field of nanosecond visible light, and has very strong reference significance.

This invention discloses a kind of the azo monomer has intramolecularly push-and-pull electron structure and its polymer three order nonlinear optics material, after azo-coupler reaction of substituent aniline and N, N- ethyl hydroxyl ethyl aniline gaining the azo midbody, and reacts with (methyl) chlorine chloride then gains the crylic acid ester monomer with the functionality azo base group, and using the atom free radical polymerization (ATRP) method get the azo side chain type polymer whose molecule chain forms the push-and-pull electron structure. The polymer has good three order nonlinear optics functions and fairly good film function.

The invention discloses a mode-locked optical fiber laser which takes a lead selenide quantum dot as a saturable absorber. Passive mode-locked optical fiber lasers based on the saturable absorbers are applied widely and gradually, bust most of existing quantum dot saturable absorbers are blocky structures, the coupling efficiency is low and the saturable absorbers are difficult to be compatible with the otpical fiber laser. The mode-locked optical fiber laser comprises a pump source, a wavelength division multiplexer, a gain optical fiber, an output coupler, a filter, an optical fiber saturable absorber and a connection optical fiber. The optical fiber saturable absorber is composed of lead selenide quantum dot-doped glass optical fiber. The pump source is a semiconductor laser with multimode tail fibers. The gain optical fiber is a ytterbium-doped optical fiber, an erbium-doped optical fiber or a thulium-doped optical fiber. The connection optical fiber is a single-mode optical fiber. According to the mode-locked optical fiber laser, the saturable absorber has higher third-order non-linear optical effect and faster time response than those of the same-component blocky material and is compatible with the mode-locked optical fiber laser.

A technique to remove second order and third order nonlinearity distortions caused by a blocker signal at an input of a radio receiver. An envelope detector is utilized at an input of the RF front-end of the receiver to obtain a magnitude of the overall signal. The output of the envelope detector is then processed at baseband to estimate coefficients that relate to the distortion. Once the coefficients are obtained, the coefficients are applied at an I/Q imbalance correction stage to also correct for the distortion by cancelling the distortion from the received signal.

The invention provides a polyarylether sulfone copolymer with a main chain containing a platinum aromatic alkyne group and a preparation method of the polyarylether sulfone copolymer, and belongs to the field of high polymer materials. The preparation method comprises the following steps: carrying out nucleophilic polycondensation on a platinum-aromatic alkyne difluorobenzene sulfone monomer, aromatic organic bisphenol and 4, 4-difluorodiphenyl sulfone to obtain the soluble polyarylether sulfone copolymer with the main chain containing platinum aromatic alkyne. A polymer optical limiting material is prepared by introducing the platinum aromatic alkyne into a main chain structure of polyarylether, so that the application of the platinum aromatic alkyne is separated from a single solution system, a polymer solid optical limiting element with excellent thermal stability and mechanical performance is constructed, and the element has excellent third-order nonlinear optical effect and optical limiting performance. The prepared platinum-containing aromatic alkyne polyarylether sulfone film keeps good mechanical performance and optical limiting performance. The prepared polyarylether sulfone with the main chain containing the platinum aromatic alkyne structure can be applied to the fields of laser protection, nonlinear optics, fluorescence detection and the like.

The invention provides a multi-pair two-component quantum entangled state micro-ring resonant cavity and a preparation method thereof. The micro-ring resonant cavity is composed of a coupling channel and a micro-ring, and the micro-ring is a micro-ring with a third-order nonlinear effect; and continuous light is used for pumping the micro-ring resonant cavity, pumping light enters the coupling channel from an input port provided by the coupling channel, part of the pumping light in the coupling channel is coupled into the micro-ring, multiple pairs of signal light and idle light are generated after interaction, and the generated multiple pairs of signal light and idle light meet the entanglement relation. The micro-ring resonant cavity disclosed by the invention can be made of a Si3N4 material with relatively high nonlinear coefficient, high integration level and stable performance. Simulation is carried out on the multi-pair double-component quantum entangled state preparation method provided by the invention, and it is verified that the high-quality multi-pair double-component quantum entangled state can be generated through the multi-pair double-component quantum entangled state preparation method.

The invention discloses an all-optical switch based on a gradient descent algorithm and an implementation method thereof. A nonlinear calculation method is introduced into the gradient descent algorithm, a third-order nonlinear optical Kerr effect is utilized, the dielectric distribution condition of a nano-micro photon structure material is changed through third-order nonlinear optical response of a signal light excitation material, and the refractive index of a nonlinear material is related to strength under the action of signal light. The reverse design based on the gradient descent algorithm provides a universal platform for the realized photonic device, and facilitates the design and integration of a nanometer photonic device. The introduction of the nonlinear algorithm is beneficial to the design of more complex functional devices, the thought of device design is broadened, and the functions of device design are enriched; the introduction of a process optimization algorithm greatly reduces the efficiency of device optimization; the all-optical integrated device realized based on reverse design has wide application prospects in the fields of advanced photonic circuits, all-optical information processing, optical communication and the like.

The invention discloses a Se-doped Bi2O2S nanosheet as well as a preparation method and the application of the Se-doped Bi2O2S nanosheet. According to the e-doped Bi2O2S nanosheet prepared by adopting a hydrothermal method, under the conditions of a laser with the pulse width of 208 femtoseconds, the wavelength of 800 nanometers and the frequency of 100 kHz, the nonlinear absorption coefficient beta and the third-order polarizability imaginary part Imx (3) value can reach-6.98 * 10 < 3 > cm * GW <-1 > and-5.37 * 10 <-7 > esu at most, the absolute values are several orders of magnitude larger than several typical two-dimensional nonlinear materials MoS2, MoSe2, graphene and black phosphorus. The Se-doped Bi2O2S nanosheet has remarkable third-order nonlinear saturated absorption performance, is an excellent saturable absorber material, and can be widely applied to the fields of ultrashort pulse laser Q-switching, mode locking and the like.

The invention relates to a nonlinear nano hybrid material based on vanadium carbide and molybdenum disulfide and a preparation method. The material is formed by uniformly growing molybdenum disulfide on the surface of vanadium carbide. Compared with the prior art, the heterojunction of the vanadium carbide and the tungsten disulfide is prepared by stacking Van der Waals force between the vanadium carbide and the tungsten disulfide; and through the synergistic effect between the vanadium carbide and the tungsten disulfide, the third-order nonlinear coefficient of the hybrid material is enhanced. According to the invention, based on the interaction force between the vanadium carbide and the tungsten disulfide, molybdenum disulfide nanosheets uniformly grow on the surface of the vanadium carbide with the three-dimensional interconnected network microstructure; a scanning electron microscope spectrum proves the surface appearance of the heterojunction; and through the synergistic effect of the vanadium carbide and the tungsten disulfide, the heterojunction shows excellent potential as an optical material under femtosecond and nanosecond test conditions.

The method prepares desired organic conjugate material photo crystal of three-dimensional non-linear by self-organizing growth of organic conjugate material, pumping laser incomes the photo crystal along [111] crystal orientation of the organic conjugate material photo crystal to excite third order non-linear effect of organic conjugate material so as to change photo band gap position of crystal, the photo band gap position can be changed by regulating pumping laser strength so tuning of response time up to fs order for the photo crystal in organic conjugate material is achieved. The device which comprises pumping light path, detecting light path and signal processing system is provided in the present invention.

The invention provides a device for generating broadband supercontinuum laser by utilizing a synergistic effect of second-order and third-order nonlinear optical effects. The device comprises a pump light source and a non-linear laser crystal, and is characterized in that the pump light source is a near-infrared femtosecond pulse laser light source, the frequency of femtosecond pulse laser provided by the pump light source has a bandwidth close to 100nm, and the femtosecond pulse laser has the characteristic of high peak power; the nonlinear laser crystal is made of a ferroelectric crystal material, the nonlinear laser crystal comprises a series of cells, and the length of the series of cells in the light propagation direction is changed along the light propagation direction according to acontinuous chirp change rule. In nonlinear laser crystal, the spectral width of a pumping spectrum can be effectively extended from 100nm to about 300-500nm by using a significant third-order nonlinear optical effect, and supercontinuum and completely coherent laser capable of covering the near 500nm bandwidth from a visible band to a near-infrared band is generated by using second-order nonlinear frequency conversion; the device has the advantages of controllable structure, easy preparation and flexible design; and the energy conversion efficiency is high, the laser spectrum broadband is supercontinuum, and the device size is small.

The invention belongs to the technical field of semiconductor materials, and particularly relates to a preparation method of a graphene and tin oxide hollow sphere composite nanomaterial, wherein themethod comprises the steps: adding deionized water into K2SnO3.3H2O, mixing urea with an ethanol solution, combining a potassium sulfate aqueous solution and a urea solution, and carrying out ultrasonic treatment to form a mixed solution; dispersing graphene oxide into water, adding the mixed solution, uniformly stirring, transferring into a high-pressure stainless steel reaction kettle taking polytetrafluoroethylene as a lining, putting the reaction kettle into a vacuum drying oven, and carrying out reaction; and after the reaction is finished, rapidly putting the high-pressure reaction kettle into ice water to quench, washing the cooled liquid with deionized water and absolute ethyl alcohol respectively, and performing vacuum drying to obtain the G/SnO2 hollow sphere composite nanomaterial. The third-order nonlinear absorption of the G/SnO2 hollow sphere composite nanomaterial synthesized by the method is saturated absorption, the third-order nonlinear refraction is self-focusing, and the G/SnO2 hollow sphere composite nanomaterial is expected to be applied to a mode-locked pulse laser, an optical memory, an optical modulator and the like.

The invention which discloses a composite nonlinear optical material made of naphthalocyanine and nitrated graphene oxide (NGO) and a preparation method thereof belongs to field of composite nonlinearoptical materials and solves the problem that the conventional nonlinear optical material is poor in third-order nonlinear optical performance. The composite nonlinear optical material is a ZnNcC4-NGO compound prepared by ZnNcC4 and the NGO, which are combined with each other via covalent bonds. The preparation method comprises the following steps: 1. ZnNcC4 is prepared; 2. the Hummers method isadopted for preparing graphene oxide (GO), and the NGO is synthesized by introducing ethylenediamine molecules on the GO; 3. the ZnNcC4 is compounded with the NGO. The composite nonlinear optical material provided by the invention and made of the naphthalocyanine and the NGO is simple in preparation method and stable in performance, has good third-order nonlinear optical performance, and shows obvious effects in reverse saturable absorption.

The invention relates to a metal-free phthalocyanine graphene nonlinear optical composite material as well as a preparation method and application thereof, and belongs to the technical field of nonlinear optical composite materials. The problems that a laser protection material in the prior art is low in linear transmittance, narrow in protection band, poor in solubility, low in damage threshold,long in response time and the like, and the third-order nonlinear optical performance of a nonlinear optical material is poor are solved. The nonlinear optical composite material provided by the invention is prepared by non-covalent binding of phthalocyanine and graphene. The nonlinear optical composite material is stable in performance, has good three-order nonlinear optical performance, can be used as an optical amplitude limiting material, and is simple in preparation method and free of pollution.

The invention discloses a dye/metal-organic framework composite material with second-order and third-order nonlinear optical properties and a preparation method and self-calibration temperature sensing application thereof. The chemical formula is [M(L)x(G)y].(R)n, M is a metal ion, L is a flexible symmetrical organic ligand containing a carboxylic acid group, G is a solvent molecule, and R represents a dye molecule in a pore channel. Under the excitation of 900-1300 nm, the metal-organic framework generates second harmonics which are not sensitive to temperature; and two-photon fluorescence generated by the dye is quenched due to high-temperature fluorescence of the dye, so that the intensity is reduced along with temperature rise. The ratio of the two signal peaks is in linear relation with the temperature, the cycle performance is good, and the sensor can be effectively applied to physiological temperature sensing. The quantum efficiency and the thermal stability of the loaded dye are obviously improved, and the dye has high stability and good biocompatibility in aqueous solutions with different pH/temperatures and PBS physiological buffer solutions. The physiological temperaturesensing is realized by utilizing two nonlinear optical signals reported for the first time.

The invention discloses a high-linearity modulator chip based on a cascaded silicon-based micro-ring modulator and a modulation method. The two lasers with different wavelengths output optical carrier signals, the optical carrier signals are combined through the on-chip beam combiner or the wavelength division multiplexer, and due to the fact that the micro-ring modulators have the wavelength selection function, two paths of optical carriers are respectively coupled into the two silicon-based micro-ring modulators through the bus waveguides. An electric modulation signal is divided into two paths through an electric power divider with an adjustable power division ratio, and the two micro-ring modulators are modulated respectively. By regulating and controlling the working points of the two micro-ring modulators, one micro-ring modulator works at a first-order harmonic component maximum point, and the other micro-ring modulator works at a third-order nonlinear maximum point. Meanwhile, the distribution ratio of the electric power divider is regulated and controlled, and during demodulation at the photoelectric detector end, through the operation, the third-order nonlinearity in the two micro-rings can be offset, and meanwhile it is guaranteed that the first-order harmonic component changes little.

The invention relates to a perylene diimide fluorescent dye with ortho-substituted benzanthrone. 3, 4, 9, 10-perylenetetracarboxylic diimide is used as a core group, imide nitrogen atoms at two ends of the core group are connected with 7-tridecyl, and the ortho-position of the core group is connected with benzanthrone. The 7-tridecyl group is introduced to the perylene diimide group, and the benzanthrone group is introduced to the ortho position, so that the obtained perylene diimide fluorescent dye of ortho-substituted benzanthrone has a large two-photon absorption cross section value, the third-order nonlinear optical activity is greatly improved, and the perylene diimide fluorescent dye can be applied to a third-order nonlinear optical material. Meanwhile, no matter whether single photons or two photons are used for exciting the aggregation states of the two photons, the perylene diimide fluorescent dye with ortho-substituted benzanthrone shows AIE properties, and has great application potential in the aspects of two-photon fluorescence imaging and two-photon dynamic therapy.