24 results about "Third order nonlinearity" patented technology

The application relates to a nonlinear optical glass, comprising a glass matrix and noble metal nanocrystals doped in the glass matrix, wherein the mass fraction of the glass matrix in the nonlinear optical glass is greater than or equal to 40%, and the composition of the glass matrix is xBi2O3-(66-x)P2O5-yZnO-(34-y)Al2O3 in terms of a mole fraction, 1 < x < 21, and 26 < y < 32. The application further provides a preparation method and application of the nonlinear optical glass. The nonlinear optical glass can realize high-concentration doping of noble metal nanocrystals and improve the third-order nonlinear performance of the nonlinear optical glass.

The application discloses a kind of cobalt-based MOF material ethanol dispersion and its preparation method and application in third-order nonlinear optics.The preparation method comprises: making cobalt source and organic ligand react, and prepare cobalt-based MOF material;Wherein, the organic ligand includes 1,3,5-tri (4-carboxyl phenyl acetylene group) benzene;And, the cobalt-based MOF material is mixed with ethanol and is broken by cell crushing device, and prepare cobalt-based MOF material ethanol dispersion;Wherein, the power of the breaking treatment is 30%-50%, and the temperature of condensate water in cell crushing device is controlled to be 1-5 ℃.The cobalt-based MOF material ethanol dispersion prepared by the application has excellent performance and reliability in optical third-order nonlinear characteristics, lays a solid practical foundation for the wide application of future all-optical devices, and is expected to promote the further development of optical technology in communication, sensing, information processing and other fields.

The application provides a thin-film lithium niobate-based optical frequency comb generation device and method, and belongs to the technical field of optical frequency combs, and comprises a pumping unit for providing single / multi-frequency laser; a microwave modulation unit for performing electro-optic modulation on a normal dispersion double-micro-ring resonant cavity unit to generate modulation sidebands; and the normal dispersion double-micro-ring resonant cavity unit generates an optical frequency comb through normal dispersion, electro-optic effect and third-order nonlinear effect. The single / multi-frequency laser is coupled to the normal dispersion double-micro-ring resonant cavity unit based on thin-film lithium niobate, and the normal dispersion, electro-optic effect and third-order nonlinear effect are combined to realize optical frequency comb spectrum widening and spectrum envelope flattening.

The invention discloses an integrated device for non-linear refractive index characterization and all-optical device demonstration. Incident light with different wavelengths is divided into a non-linear optical characterization light path and an all-optical regulation and control light path through a non-polarization beam splitter prism. The band-pass filter assembly is arranged on the characterization light path, a specific wavelength is selected by switching filters, and it is ensured that a single light beam acts on a sample to excite spatial self-phase modulation. The all-optical regulation and control light path is focused and irradiated to the same sample so as to realize the functions of an all-optical switch, an all-optical modulator and the like. The two light beams can act independently or synchronously, and integrated operation of material third-order nonlinear optical parameter measurement and all-optical regulation and control demonstration is achieved. The device is simple in structure, high in reconfigurability, flexible in switching and suitable for nonlinear optical research and device application of various two-dimensional materials.

The invention belongs to the field of nonlinear optical materials, and discloses a noble metal nanoparticle loaded chiral non-planar covalent organic framework composite material as well as a preparation method and application thereof. The composite material takes a chiral non-planar covalent organic framework as a carrier, and noble metal nanoparticles are uniformly distributed on the carrier; and the chiral non-planar covalent organic framework is R-TpPz, S-TpPz, R-TpDz or S-TpDz. The preparation method comprises the following steps: adding the chiral non-planar covalent organic framework into a water-soluble noble metal salt solution, stirring at room temperature in a dark place until noble metal ions are fully adsorbed into the chiral non-planar covalent organic framework, and airing at room temperature in a dark place; and placing the aired sample in a vacuum environment, and carrying out thermal reduction at 80-100 DEG C for 10-12 h to obtain a target product. The composite material is applied as a third-order nonlinear optical material. According to the invention, precious metal nanoparticles are creatively loaded in a chiral non-planar covalent organic framework, so that active regulation and control of nonlinear optical properties are realized.

An apparatus for outputting a photon, the apparatus comprising an EM source arrangement for outputting phase modulated EM radiation; the phase modulated EM radiation comprising a set of one or more properties; the arrangement comprising at least one electromagnetic, EM, source for generating EM radiation at a plurality of different wavelengths; a modulator for receiving the EM radiation; phase modulating the received EM radiation; and outputting phase modulated EM radiation; an optical fibre for receiving the phase modulated EM radiation; converting, using a third order nonlinear susceptibility of the optical fibre, at least one photon of the phase modulated EM radiation into a first new photon; and a second new photon and outputting at least the first new photon, wherein the set of one or more properties comprises a wavelength of the phase modulated EM radiation and provides for the phase modulated EM radiation to propagate along the optical fibre with at least a positive value of a second order dispersion parameter; and a negative value of a fourth order dispersion parameter.

The application discloses a device and method for generating mid-infrared laser based on period phase matching crystal, which comprises a pulse pumping source, a resonant cavity, a pumping input mirror, a nonlinear crystal, a dispersion management element, a third-order nonlinear effect unit and a filter. The resonant cavity comprises a first curved mirror, a second curved mirror, a cavity mirror and an output coupling mirror arranged in an X-shaped structure. The pulse pumping source outputs pumping light which generates signal light and idler light after passing through the nonlinear crystal. The idler light is widened to a required bandwidth by the third-order nonlinear effect unit and oscillation is established in the resonant cavity. The cavity length of the resonant cavity is matched with the repetition frequency of the pumping source, so that the idler light, the adjacent period pumping light and the signal light are coincided in time and space, the gain of the idler light is greater than the loss, and the required broadband mid-infrared laser output is formed. The device can directly generate super wideband idler light without wavelength tuning, has a lower overall cost and has a higher popularization value.

The application provides a wavelength converter, an optical network node device and a preparation method of the wavelength converter, which can be applied to scenarios such as wavelength division optical communication networks. The wavelength converter comprises a cladding, a plurality of ring structures and a graphene piece, the plurality of ring structures are located in an internal space surrounded by the cladding, and at least part of the graphene piece is located in an optical wave transmission area, and the optical wave transmission area is located in the internal space. The wavelength converter of the application combines and utilizes the wide-spectrum ultra-low dispersion and optical field binding capacity of the optical fiber composed of the cladding and the ring structure, and the dispersion-free, wide-band low-loss transmission characteristics and ultra-high third-order nonlinear coefficient of the graphene piece, the conversion bandwidth can reach 461 nm, and the conversion efficiency can reach -21.7 dB.

The invention discloses a reflective harmonic radiation enhancement device and a preparation method thereof, and aims to overcome the defects of low nonlinear harmonic conversion efficiency, weak metal nonlinearity, insufficient concentration of a pure medium light field and the like in the prior art. The device comprises an outer protective layer and an internal F-P cavity, the F-P cavity is composed of a first reflecting layer, a dielectric layer and a second reflecting layer, the first reflecting layer is a super-structure surface with gold nano units arranged periodically, and the dielectric layer adopts an organic polymer PFO film. Double enhancement of a light field is achieved through the synergistic effect of local surface plasmon resonance and F-P cavity mode resonance, and the third harmonic conversion efficiency is improved by more than two orders of magnitude compared with a single nonlinear film in combination with the high third-order nonlinear coefficient of PFO. The preparation method adopts the processes of electron beam exposure, evaporation, spin coating and the like, and is simple in process and high in integration. The device is good in stability and wide in adaptability, the limitation of a single resonance mechanism is effectively broken through, and a reliable solution is provided for nonlinear optical signal regulation and control and integrated device application.

The invention relates to a terahertz wave single-shot measuring device and method based on cross polarized wave spectrum broadening. The measuring device comprises the steps that light emitted by a femtosecond laser light source is split into reflected light and transmission light after passing through a beam splitting piece; the reflected light is used as pump light for generating terahertz waves, and the generated terahertz waves are collected by a parabolic mirror and focused on an electro-optical crystal; transmission light sequentially passes through a first reflecting mirror, a diaphragm, a half-wave plate, a first linear polarizer, a lens combination and a plurality of third-order nonlinear crystal combinations to generate cross-polarized waves with broadened frequency spectrums; the generated cross polarized wave is broadened by the chirped pulse to serve as new detection light, the new detection light is further focused on the electro-optical crystal through the lens and coincides with the focus of the terahertz wave, the detection light modulated by the electro-optical effect is collected by the spectrograph, a spectrum is detected, and single-shot measurement of the terahertz wave is achieved. Compared with the prior art, the method has the advantages of high time resolution, high signal-to-noise ratio and the like for single-shot measurement of terahertz waveforms.

The invention discloses an optical frequency comb generating device based on a thin-film lithium tantalate grating FP (Fabry-Perot) microcavity, which is characterized by comprising a pumping unit, a microwave modulation unit and a normal dispersion grating FP resonant cavity unit. A low-power / high-power single-frequency laser pump enters an input coupling film lithium tantalate waveguide, and then is coupled to a normal dispersion grating FP resonant cavity unit through an Euler bending-based S-shaped waveguide and a small-perimeter annular micro-cavity, effective excitation of a fundamental mode is ensured based on Euler bending, a high-order mode is suppressed, a sideband is generated through electro-optical modulation, and a high-frequency laser is generated. Multi-frequency laser is generated, spectrum broadening and spectrum envelope planarization of the optical frequency comb are achieved through the combined effect of normal dispersion, the electro-optical modulation effect, the third-order nonlinear effect and high-reflectivity broadband apodized grating filtering, and finally the generated optical frequency comb is output through the output coupling waveguide. Complex mode cross coupling regulation and control are avoided, and generation of a high-efficiency optical frequency comb with a relatively flat normal dispersion area is realized.

The invention discloses a three-order nonlinear coefficient measurement method based on Airy beams, relates to the field of three-order nonlinear coefficient measurement of thin-layer optical materials, and aims to solve the problem that in the prior art, single measurement, high precision and low damage cannot be met at the same time. A cubic phase mask and a sample behind the cubic phase mask are irradiated through parallel Gaussian light, an Airy beam image is collected after Fourier transform and image amplification, and the third-order nonlinear coefficient of the material can be calculated through displacement and light field parameters of the Airy beam. The method is applicable to thin-layer samples, high in measurement precision, capable of directly determining specific coefficient values and symbols through single measurement, applicable to light damage sensitive materials, simple in measurement device and low in data processing difficulty. The invention provides a more robust and less invasive alternative for characterizing the nonlinear response in a thin sample.

The application provides a nonlinear optical crystal and a frequency converter for generating third harmonic laser, and belongs to the field of optical technology. The nonlinear optical crystal comprises a centrosymmetric nonlinear optical crystal, and a periodic microstructure composed of a plurality of amorphous regions and a plurality of single crystal regions is arranged in the nonlinear optical crystal along a light transmission direction of the crystal. The amorphous regions are phase control units, and the third-order nonlinear coefficient in each amorphous region is zero. The single crystal regions are laser frequency conversion units, and the third-order nonlinear coefficient in each single crystal region is not zero. The application can realize efficient and stable output of third harmonic laser.

The invention belongs to the technical field of integrated photonics and nonlinear optics, and particularly relates to a magnesium oxide doped film lithium niobate microcavity optical comb generation method. Firstly, a film lithium niobate material doped with 5 mol.% of magnesium oxide is adopted, the optical damage threshold of the film lithium niobate material is 130 times that of pure lithium niobate, and the high pumping power bearing capacity and the long-term operation stability of the microcavity are remarkably improved. Secondly, the Kerr soliton optical comb is generated in the two microcavity structures of the air cladding and the silicon dioxide in combination with the third-order nonlinearity of the material and dispersion optimization of the microcavity structures. The silicon dioxide cladding microcavity provides structural support for integration of functional units such as a subsequent thermal tuning electrode. Besides, the invention also verifies that the micro-cavity based on the material platform has a weak photorefractive effect and has the capability of generating soliton optical combs under low pumping power, which indicates that the micro-cavity has good engineering realizability and application potential.

The application discloses a single-pump four-wave mixing light source, which utilizes a light source spectrum widening technology generated by a third-order nonlinear effect in an optical fiber, and achieves spectrum conversion and light power transfer by injecting high-power pump light into a high-nonlinear optical fiber, so as to realize a wide-spectrum light source and high output power. The spectrum width and the power are related to the pump light source power and the parameters of the nonlinear optical fiber, and the light source power has no upper limit in theory. As a light source, the application can improve the detection precision of a high-precision fiber interferometer.

The application discloses a nonlinear wide spectrum fiber light source, which is a technology for expanding the spectrum of a light source by using the third-order nonlinear effect in an optical fiber. High-power laser with two wavelengths is injected into a high nonlinear optical fiber as pumping light to achieve spectrum conversion and light power transfer, so that a wide spectrum light source and high output power are realized. The width and power of the spectrum of the light source are related to the pumping light power and the parameters of the nonlinear optical fiber. The light source power theoretically has no upper limit. The light source is used for a high-precision fiber interferometer, which is a brand-new technical approach.

The invention discloses a quantum imaging device based on third-order nonlinear micro-ring cavity enhancement, and the device employs two sets of continuous narrow linewidth laser to pump a third-order nonlinear micro-ring cavity, and outputs quantum correlated photon pairs at the two ends of the micro-ring cavity at the same time. Through precise phase control, the polarization controller and the polarization beam combiner are combined to combine photons, and yield-enhanced quantum correlated photon pairs are formed. The combined signal photons are used for irradiating a to-be-detected sample, and the position of the sample is adjusted through the three-dimensional scanning platform so as to collect reflected signal photons at different positions of the sample; and finally, coincidence count values of different positions are obtained by measuring coincidence counts of reflected signal photons and idler frequency photons, so that two-dimensional morphology information of the sample is reconstructed. The optical fiber integrated third-order nonlinear micro-ring cavity adopted by the invention not only maintains the quantum characteristics of the light source, but also remarkably improves the yield of photon pairs, and effectively improves the signal-to-noise ratio of microstructure imaging.

The invention belongs to the technical field of quantum information science, and particularly relates to a four-photon entangled quantum light source and an implementation method thereof. According to the invention, a multi-hue dry pumping scheme is adopted, so that the three-order nonlinear optical device simultaneously generates two processes of degenerate spontaneous four-wave mixing and non-degenerate spontaneous four-wave mixing under the condition of meeting energy conservation and momentum conservation, thereby enabling associated photon pairs generated by the three-order nonlinear optical device to present entanglement characteristics, and further realizing the generation of a four-photon entanglement state. According to the four-photon entangled quantum light source disclosed by the invention, the improvement of the light quantum entanglement dimension can be realized in a compact, high-stability and extensible form, so that more efficient, safer and more accurate quantum information processing and transmission are realized.

The invention provides a Cu4 (B4O4) (Z) 8X4 boron-oxygen molecular crystalline substance, X is Cl, Br or I, B4O4 is a boron-oxygen eight-membered ring in the structure center of the boron-oxygen molecular crystalline substance, and Z is 4-methylpyrazole. The Cu4 (B4O4) (Z) 8X4 boron-oxygen molecular crystalline substance is obtained by mixing reaction raw materials and then carrying out one-step self-assembly reaction through a solvothermal synthesis method. The method is simple in synthesis step, high in repeatability, capable of realizing large-scale stable synthesis, low in requirement on purity of raw materials, capable of realizing large-scale synthesis and beneficial to large-scale production, and the yield reaches 70% or above. Besides, the Cu4 (B4O4) (Z) 8X4 boron-oxygen molecular crystalline substance has good stability in air and ethanol, shows a saturated absorption response signal in a third-order nonlinear optical performance test, and can be used as a nonlinear optical material.

The application discloses a water-soluble dye functionalized potassium hydrogen phthalate nonlinear optical crystal and a preparation method and application thereof. The chemical formula of the potassium hydrogen phthalate crystal matrix is C8H5O4K, the water-soluble dye functionalized potassium hydrogen phthalate nonlinear optical crystal belongs to an orthorhombic system, a space group is Pca21, and the cell parameters are alpha = beta = gamma = 90 degrees. The crystal material has good third-order nonlinear optical performance and shows a significant saturated absorption effect. A large-size water-soluble dye functionalized potassium hydrogen phthalate nonlinear optical crystal is grown by using a constant-temperature evaporation method, and the preparation method has the advantages of simple operation, low cost, less pollution, low toxicity of raw materials, and short growth cycle. The water-soluble dye functionalized potassium hydrogen phthalate nonlinear optical crystal is not deliquescent in air, has stable physical and chemical properties, is easy to cut and polish, and is suitable for manufacturing nonlinear optical devices.

A single-shot femtosecond laser pulse waveform measurement device. The vertically polarized, spatially uniform femtosecond laser pulse to be measured is split into transmitted and reflected light by a beam splitter. The transmitted light is further split into two beams. These three beams are incident on a nonlinear crystal along the edges of a regular triangular prism at the same angle and with equal optical path lengths, undergoing third-order nonlinear harmonic transformation. The resulting third-harmonic beam is the second-order intensity-correlated signal of the measured pulse, after spatiotemporal transformation and double delay. The pulse waveform information is then obtained through image decoding. This invention improves time resolution, is low-cost, and easy to adjust.

The invention provides a quantum entanglement source preparation method and analysis method based on a double-coupling topology microcavity. The preparation method comprises the following steps: selecting a silicon nitride material to manufacture two micro-ring resonant cavities, namely a micro-cavity A and a micro-cavity B; pumping light is input into the microcavity A from the straight waveguide; after pump light enters the microcavity A, based on the third-order nonlinear effect of a silicon nitride material, when the phase matching condition is met, a spontaneous four-wave mixing process occurs in the cavity, and in the process, photons of the pump light interact to generate a pair of signal light and idle light with entanglement characteristics. According to the method, a continuous variable quantum entanglement generation scheme based on the coupled topology microcavity is designed by utilizing the topology protection characteristic of the double-coupled topology microcavity. The nonlinear optical effect is introduced into the coupled topological microcavity, and the generation of entangled photon pairs is realized by using an optical four-wave mixing process. According to the invention, the quantum entanglement state of the continuous variable can be efficiently generated in the coupled topology microcavity.

The invention belongs to the field of nonlinear optical materials, and discloses a UiO-66 (at) Ag-Au-D / L-Cys composite material as well as a preparation method and application of the UiO-66 (at) Ag-Au-D / L-Cys composite material. The composite material takes UiO-66 as a carrier, Ag-Au-D / L-Cys nanoparticles are uniformly distributed on the carrier, and the composite material has a chiral characteristic. The preparation method comprises the following steps: adding UiO-66 into a silver nitrate solution, and reacting to obtain a product I; the product I is placed in N, N-dimethylformamide for a reaction, and a product II is obtained; placing the product II in a D / L-cysteine solution for reaction to obtain a product III; placing the product III in a chloroauric acid solution to react to obtain a target product. The composite material disclosed by the invention realizes uniform dispersion of chiral Ag-Au-D / L-Cys nanoparticles on UiO-66, so that agglomeration of metal nanoparticles is avoided, the third-order nonlinear performance is enhanced, and the nonlinear performance can be effectively regulated and controlled.

The application discloses a two-dimensional red phosphorus nanosheet, a preparation method thereof and a third-order nonlinear optical modulator containing the two-dimensional red phosphorus nanosheet. The preparation method comprises the following steps: dissolving halogenated phosphorus in a low-boiling-point solvent, adding levorotatory ascorbic acid, uniformly mixing, and removing the low-boiling-point solvent at 20-50 DEG C under vacuum to obtain a precursor; heating the precursor under an inert atmosphere to make the precursor undergo a pyrolysis reaction at an interface, and obtaining a two-dimensional red phosphorus powder after cooling, washing and freeze-drying. The two-dimensional red phosphorus nanosheet with a thin sheet thickness can be prepared in a large amount at a lower temperature by using the preparation method, and the operation is simple and the synthesis period is short. The obtained two-dimensional red phosphorus nanosheet is used to prepare the third-order nonlinear optical modulator, and the third-order nonlinear optical modulator has a significant solvent-dependent effect and can realize modulation between saturated absorption and anti-saturated absorption.