350 results about "Nonlinear optical" patented technology

A nonlinear all optical machine learning system (NAOMLS) with nonlinear optical resonator-based continuous wave and / or spiking neurons (NORs) and linear optical components or layers (LOL) learns to implement target tasks after machine learning based direct and / or indirect inverse design and / or optimization of the NORs and / or optimization of the LOL. The inversely designed and / or optimized NORs and the optimized LOL collectively define learnable mapping functions between input lights and output lights of the NAOMLS to meet target objectives for target tasks. In some embodiments, the NORs are indirectly and inversely designed to meet inversely designed objectives in order to be integrated with the NAOMLS so that the NAOMLS can function properly to meet target objectives for target tasks. In some embodiments, the NORs are integrated directly with the NAOMLS and inversely designed and / or optimized with the LOL to directly meet target objectives for target tasks.

The invention discloses an underwater image de-scattering method, system and device for scattering field decoupling in the technical field of underwater optical imaging and computer vision, and the method comprises the steps: calculating an intensity graph and a scene linear polarization degree graph according to an obtained multi-scale underwater image; according to the intensity image, performing image signal decomposition by using a dynamically constrained background light separation model to obtain a background scattering component and a target feature component; according to the scene linear polarization degree map and the background scattering component, calculating fusion transmissivity according to a non-linear optical transmission equation; carrying out noise suppression processing on the fusion transmissivity by adopting a double-constraint optimization architecture to obtain the fusion transmissivity subjected to noise suppression processing; and performing image reconstruction through a reverse optical propagation model according to the fusion transmissivity and the target feature component subjected to noise suppression processing to obtain a scattering-removed underwater image. The method effectively breaks through the dependence of a traditional method on the uniform hypothesis of a scattered field, and provides high-precision visual restoration support for an underwater detection task.

The invention belongs to the technical field of nonlinear optics, and discloses a method and a structure for realizing nonlinear waveguide quasi-phase matching. A plurality of groups of micro-nano structures are formed on the nonlinear waveguide along the waveguide propagation direction, each group of micro-nano structures comprises one or more air holes, the micro-nano structures are utilized to cause relative phases between different wavelength modes to generate jump, phase differences caused by phase mismatch are compensated, and quasi-phase matching is realized. The phase matching scheme provided by the invention is applicable to all nonlinear materials and waveguides, and has the advantage of high universality.

The invention belongs to the technical field of optical signal collection and imaging, and particularly relates to a multi-path nonlinear optical signal collection device. The adjusting table is used for bearing a to-be-detected sample and adjusting the spatial pose of the to-be-detected sample, the laser emitting module is used for emitting laser, the to-be-detected sample is excited by the laser to obtain a nonlinear optical signal, the nonlinear optical signal is incident to the overturning mirror through the reflection transmission unit or the transmission transmission unit, and the overturning mirror is used for adjusting the spatial pose of the to-be-detected sample through angle adjustment. The nonlinear optical signal is reflected to a first signal processing module or a second signal processing module, and the first signal processing module processes the nonlinear optical signal from the reflection transmission unit or the transmission transmission unit to obtain a spectral analysis processing result; and the second signal processing module processes the nonlinear optical signal from the reflection transmission unit or the transmission transmission unit to obtain an electric signal processing result. The device is used for collecting non-linear optical signals of far-end detection optical paths of reflection, transmission, oblique incidence and the like.

The invention provides a preparation method and application of a compound cesium ammonium fluoborate and a cesium ammonium fluoborate nonlinear optical crystal. The chemical formula of the compound is CsNH4B8O12F2; the chemical formula of the crystal is CsNH4B8O12F2, the crystal belongs to a trigonal system, the space group is P321, and the unit cell parameters are as follows: a = b = 6.5858 (4) + / -0.02, c = 7.8163 (6) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees and Z = 1. The crystal is grown by adopting a vacuum high-temperature solution method, a room-temperature solution method or a hydrothermal method, and the ultraviolet transmission cut-off edge of the crystal is lower than 190 nm. The nonlinear optical effect of the crystal is about 2.5 times of that of KH2PO4 (KDP), and the shortest I-type phase matching wavelength is 175.5 nm. The crystal has the advantages of simple preparation method, low toxicity of used initial raw materials, small harm to human bodies, stable physical and chemical properties, uniaxial crystal, easiness in application and the like. The method can be widely applied to nonlinear optical devices such as ultraviolet and deep ultraviolet all-solid-state lasers, optical parametric oscillators and the like.

This invention relates to a compound, magnesium gallium selenide (MgHgGa4Se8), and a magnesium gallium selenide (MgHgGa4Se8) infrared nonlinear optical crystal, along with their preparation methods and applications. The compound has the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol. The crystal, also with the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol, lacks a center of symmetry, belongs to the tetragonal crystal system, and has a space group of MgHgGa4Se8. Its cell parameters are α = β = γ = 90°, Z = 1, and its volume is determined by the high-temperature melt method, chemical vapor transport method, or crucible lowering method. This crystal exhibits advantages such as significant nonlinear optical effects, good crystal growth habit, good mechanical properties, high hardness, resistance to breakage and deliquescence, and ease of processing and storage. It can be used to fabricate infrared nonlinear optical devices, which have important applications in optoelectronic warfare, laser communication, and medical fields.

A light source includes a mode-locked laser; a beam splitter that branches the femtosecond optical pulse train; a CW solid-state laser; a first beam combiner that outputs one side of the femtosecond optical pulse train on the same axis; a secondary nonlinear optical element that outputs a difference frequency generation and conversion optical pulse train from either a continuous wave or a femtosecond optical pulse train; an amplifier that amplifies the difference frequency generation and conversion optical pulse train; a polarization-maintaining all normal dispersion high nonlinear fiber that converts the other femtosecond optical pulse train into a supercontinuum optical pulse train; a first dispersion medium that converts the supercontinuum optical pulse train into a pulse width that is approximately the same as the difference frequency generation and conversion optical pulse train; and a second beam combiner that multiplexes and outputs the difference frequency generation and conversion optical pulse train and the supercontinuum optical pulse train.

The disclosure is related to systems, assemblies, apparatus, and methods relating to a radiation source for generating broadband radiation. The radiation source comprises a photonic crystal surface emitting laser PCSEL configured to output radiation at a first wavelength. The radiation source also comprises a non-linear optical element arranged to receive the radiation output by the PCSEL. The non-linear optical element is configured to convert the first wavelength radiation from the PCSEL into broadband radiation to be output by the radiation source through non-linear effects.

The application provides a nonlinear optical effect generation method, relates to the field of optoelectronic technology, and comprises the following steps: fixing and placing a polar ion crystal as a nonlinear medium, the polar ion crystal being a diatomic crystal or a polyatomic crystal with an optical phonon mode; using a modulated terahertz wave to excite a stimulated phonon polariton in the nonlinear medium, so as to enhance the nonlinear efficiency of signal light incident on the nonlinear medium; and adjusting the polarization angle and the incident angle of the signal light and / or the modulated terahertz wave, so as to generate a nonlinear optical effect. The application is based on the characteristics of the interaction between light and matter modulated by the stimulated phonon polariton, and the nonlinear polarizability is greatly improved by using the stimulated phonon polariton, so that the weak light nonlinear effect of most wavelengths of light can be realized efficiently; and the nonlinear optical effect has the advantages of high refresh rate, wide spectral response, low threshold and low power consumption.

To remove a non-resonance background signal without replacing a sample.SOLUTION: The nonlinear optical device 102 includes an irradiation part 106 for generating pump light, Stokes light, first probe light, and second probe light delayed from the first probe light and irradiating a sample with them, and a detector 108 for detecting the intensity of scattered light from the sample. When the sample is irradiated with the pump light and the Stokes light, resonance and a non-resonant background are generated, and when the sample is irradiated with the first probe light, an intensity of a rising portion of a non-resonant background (NRB) signal is detected without detecting an intensity of a resonance signal, and when the sample is irradiated with the second probe light, an intensity of a signal in which a falling portion of the NRB signal and the resonance signal are mixed is detected. The optical path lengths of the first probe light and the second probe light are set so that the intensity of the rising portion and the intensity of the falling portion of the NRB signal are equal to each other.SELECTED DRAWING: Figure 1

The invention relates to a novel second-order nonlinear optical crystal-potassium cadmium germanate (K4Cd3Ge4O13), and belongs to the field of optical crystal materials. The crystal is prepared by adopting a high-temperature solid-phase method and a high-temperature solution method, belongs to an orthorhombic crystal system and a C2 space group, is accurate in measurement of cell parameters, and shows excellent nonlinear optical characteristics and a wide light transmission range. The ultraviolet cut-off edge of the crystal is 261 nm, the infrared spectrum permeability is not obviously reduced in the range of 4000-714 cm <-1 >, the transmission range of the crystal can effectively cover a key atmosphere transmission window of 3-5 microns, and the crystal has powder frequency doubling response equivalent to that of a KDP crystal and can be applied to an all-solid-state laser as a mid-infrared nonlinear optical crystal.

The application provides a ternary mixed metal organotin supertetrahedral chalcogenide cluster crystal state for resin catalysts and a synthesis method and application thereof. The chalcogenide cluster compound comprises at least a core and a periphery, the core comprises metal ions, and the periphery comprises organotin; the core and the periphery form a cluster structure; and the molecular general formula of the chalcogenide cluster compound is (RSn)4M4M'2S 16 wherein R is selected from n-butyl (nBu) and / or phenyl (Ph); M is selected from In or Ga; and M' is selected from Zn, Cd, Mn and Co. The synthesis method of the application has low requirements on the purity of raw materials, simple process, and the crystal state is easy to repeat, convenient for production. The yield of the chalcogenide cluster crystal state obtained by the synthesis method of the application can reach more than 45%. The chalcogenide cluster compound of the application can be used in the fields of photoelectric catalysis and nonlinear optics.

This application discloses a method and device for fabricating a periodically polarized ultrathin lithium niobate / lithium tantalate device, belonging to the field of nonlinear optical device manufacturing. The method includes: fabricating and polarizing periodic electrodes on a provided ferroelectric crystal wafer to form a periodically polarized master wafer; bonding the master wafer to a carrier substrate using optical resin-assisted bonding or direct bonding to form a composite structure; thinning and polishing the side of the master wafer away from the carrier substrate to obtain an ultrathin periodically polarized crystal functional layer; and fabricating the structure of the ultrathin periodically polarized crystal functional layer to obtain a periodically polarized ultrathin lithium niobate / lithium tantalate device. This method avoids the inherent problems of high-voltage breakdown and poor domain quality in existing technologies when directly polarizing ultrathin crystals by placing the high-risk polarization step on a thick, stable wafer.

This invention belongs to the field of quantum dot technology and discloses a method for preparing large-size all-inorganic CsPbI3 perovskite nanosheets. The method includes the following steps: first, large-size PbI2 nanosheets are grown on mica sheets using physical vapor deposition (PVD) with ground PbI2 powder; then, ground CsI powder and the mica substrate with deposited PbI2 nanosheets are placed in a dual-temperature zone tube furnace, and large-size all-inorganic CsPbI3 perovskite nanosheets are synthesized by controlling the system pressure and gas flow rate. The molar ratio of PbI2 to CsI is 1:1. The nanosheets prepared by this invention have controllable size, single-crystal structure, low defects, high phase purity, regular morphology, and excellent stability. The preparation process is simple and easy to operate, and can be directly applied to photodetectors, light-emitting devices, nonlinear optical devices, and other fields.

The present invention relates to the field of large-field-of-view scenes. Provided is a nonlinear optical large-field-of-view imaging system, comprising a light source system, a laser scanning system and a laser detection system, wherein the light source system is configured to emit laser; the laser scanning system comprises a focusing lens and a galvanometer, wherein the galvanometer is located between the focusing lens and a sample to be detected, the focusing lens is configured to focus the laser on said sample, and the galvanometer vibrates according to a preset scanning angle so as to realize scanning of a laser focus on said sample; and the laser detection system comprises a compound-eye collection structure and a detector, wherein the compound-eye collection structure comprises a plurality of individual lenses which are closely arranged, optical signals generated by said sample are incident on the compound-eye collection structure, and the detector is configured to detect the optical signals collected by the compound-eye collection structure. The present invention can expand a laser scanning imaging range, can ensure that a laser beam always propagates along the optical axis of the focusing lens, and can comprehensively collect signals excited across the entire scanning field of view, thereby improving the efficiency of large-field-of-view imaging and increasing the signal intensity.

The present disclosure is directed, in general, to (1) nonlinear optical (NLO) chromophores containing furanyl accepting groups, including (2) compositions / materials / resistive layers comprising NLO chromophores containing furanyl accepting groups, and the methods of making the compositions / materials / resistive layers comprising NLO chromophores containing furanyl accepting groups (e.g., methods of drying and / or poling, and the like), (3) uses of NLO chromophores containing furanyl accepting groups in electro-optic devices (e.g., EOMs).

This application relates to a femtosecond laser multi-degree-of-freedom personalized reshaping method and system for intracorneal implants, belonging to the field of femtosecond laser processing technology. Utilizing the cold processing characteristics of femtosecond lasers, the intracorneal implant is individually cut and ablated to obtain the desired three-dimensional corneal shape, precisely shaping the curvature, thickness, and contour of the lens to perfectly match the patient's corneal capsule or lesion area. By leveraging the nonlinear optical effect induced at the focal point of the femtosecond laser, the stromal collagen network in the weak areas corresponding to corneal expansion can be densified through laser processing, significantly improving the local elastic modulus and resistance to deformation. In areas requiring a smooth transition with the recipient cornea or adjustment of refractive power, controllable micropores or low-density areas can be induced, appropriately reducing local stiffness, thereby achieving a spatial gradient distribution of internal mechanical properties and customizing the overall mechanical behavior and morphological stability after implantation.

One embodiment of the nonlinear light-absorbing material disclosed herein comprises a compound represented by the following formula (1) as its main component. In formula (1), R 1 ~R 10 Each group can be a hydrogen atom, halogen atom, saturated hydrocarbon group, haloalkyl group, unsaturated hydrocarbon group, hydroxyl group, carboxyl group, alkoxycarbonyl group, aldehyde group, acyl group, amide group, nitrile group, alkoxy group, acyloxy group, thiol group, alkylthio group, sulfonic acid group, acylthio group, alkylsulfonyl group, sulfonamide group, primary amino group, secondary amino group, tertiary amino group, or nitro group.

The application relates to a fluorine-containing ferroelectric nematic liquid crystal molecule and application thereof, relates to the technical field of photoelectric materials, and solves the problem of low dielectric constant of traditional liquid crystal materials which restricts the application of the liquid crystal materials in photoelectric functional devices. The molecule adopts a unique non-chiral V-shaped configuration design, takes a benzene ring as a core skeleton, and realizes performance optimization through meta-connection of differentiated functional side chains. In the molecular structure design, a strong electron-withdrawing trifluoromethyl substituent is introduced into the benzene ring 2, 4 of one end of the side chain, the intermolecular interaction force is enhanced, and the long-range order of the material is maintained; the other end adopts an alkoxy flexible chain structure, which not only improves the solubility of the material, but also enhances the thermal stability. The raw material is easy to obtain, the preparation is simple, the fluorine-containing ferroelectric liquid crystal molecule is in a nematic phase, the dielectric constant can be as high as 1.4 x 10 4 (1 kHz), and has a wide ferroelectric nematic phase transition temperature, high polarization intensity and nonlinear optical response, and has important application value in the field of photoelectric functional materials.

This application provides a lightweight imaging probe and imaging device using a superlens, relating to the field of nonlinear optical imaging. By employing a split structure, a miniaturized imaging probe is achieved. During imaging, the imaging probe can be fixedly connected to the object being imaged. Excitation light is used to induce nonlinear optical effects within the object, thereby acquiring optical signals reflecting the internal structure of the object. Specifically, this application ensures that the laser is precisely focused on a specific position within the object corresponding to the scanning angle through a coordinated optical path design of the scanning galvanometer, scanning lens, and objective lens. This effectively triggers nonlinear optical effects while ensuring efficient acquisition of optical signals, thus providing a reliable technical foundation for high-resolution internal imaging. Furthermore, this application uses a superlens structure to construct the objective lens, avoiding the weight and weight associated with traditional optical objectives, thereby achieving a lightweight imaging probe, reducing the impact on the object being imaged, and obtaining more accurate images.

The present application relates to ferroelectric nematic liquid crystal (FNLC) compounds characterized by chemical structures having electron donor–acceptor chromophores connected via linkers. The compounds have a general structure of A1–L1–A2–L2–(Ax–Ly)n–B, where A and B are aryl or heteroaryl groups, and L are linkers selected to promote spontaneous polar alignment in the nematic phase. The FNLCs enable enhanced second-order nonlinear optical properties and electro-optic coefficients (r33), with values exceeding, e.g., 30 pm / V in some embodiments. The FNLC compounds also exhibit absorption maxima above 400 nm, indicating extended π-conjugation and strong intramolecular charge transfer. The present application also includes compositions and mixtures of such compounds, which may form glassy ferroelectric nematic phases suitable for integration into nonlinear optical devices.

This invention relates to a potassium hydroxyborate nonlinear optical crystal, its preparation method, and its applications. The crystal has the chemical formula K₂B₅O₈(OH), a molecular weight of 277.26, belongs to the orthorhombic crystal system, and has a space group of [missing information]. Pca 21, with unit cell parameters a=8.5523(8)Å, b=7.3326(7)Å, c=12.9739(10)Å, α=β=γ=90°, V=813.60(13)Å. 3 A nonlinear optical crystal composed of potassium hydroxyborate can be obtained using a mild hydrothermal (solvothermal) method through programmed or natural cooling. The frequency doubling effect of this crystal powder is approximately twice that of KDP (KH₂PO₄), and its ultraviolet cutoff edge is below 200 nm, making it suitable as a deep-ultraviolet nonlinear optical crystal. The crystal growth process offers advantages such as simple operation, low raw material toxicity, short growth cycle, low cost, and stable physicochemical properties. It has been widely applied in the fabrication of nonlinear optical devices such as frequency doubling generators, up- or down-frequency converters, or optical parametric oscillators.

A device, method, and hybrid computing architecture for a Symbolic Photonic Logic Gate (SPLG) system that performs data processing primarily in the optical domain. The system comprises a photonic substrate, including silicon-photonics, indium phosphide, or similar optically active materials, patterned with optical waveguides and interferometric structures configured to implement logic operations through controlled optical interference, phase modulation, or non-linear optical effects. The SPLG system is configured to execute Boolean and symbolic logic functions without requiring intermediate optical-to-electrical signal conversion. In operation, information is encoded into one or more optical parameters including phase, polarization, wavelength, or amplitude, and processed within a Symbolic Optical Core optimized for linear algebraic operations such as matrix multiplication and vector transformation. The architecture further comprises an electronic control layer configured to initialize, configure, and monitor the photonic logic elements while allowing the majority of computational operations to occur within the optical domain, thereby reducing electrical interconnect congestion and resistive heating relative to fully electronic processors.

The present invention relates to a rubidium fluoro-scandium borate compound, a rubidium fluoro-scandium borate nonlinear optical crystal, and a preparation method and application thereof. The rubidium fluoro-scandium borate compound has a chemical formula Rb2ScB3O6F2, does not contain a symmetry center and has a molecular weight of 382.33 g / mol. The rubidium fluoro-scandium borate nonlinear optical crystal belongs to the monoclinic crystal system, and belongs to the non-centrosymmetric space group P21, and the unit cell parameters are: a=4.0372(10) Å, b=11.800(3) Å, c=8.823(2) Å, α=γ=90°, β=98.327(11)°, Z=2. The present invention adopts a high-temperature vacuum packaging method or a solid-state synthesis method to prepare rubidium fluoro-scandium borate compounds. The present invention adopts a fluxing agent method to prepare a rubidium fluoro-scandium borate nonlinear optical crystal, which have the advantages of short absorption cutoff edge, large nonlinear optical effect, good thermal stability, and stable physical and chemical properties. The rubidium fluoro-scandium borate nonlinear optical crystal of the present invention can be used to fabricate nonlinear optical devices, which have important applications in fields such as optics, military, laser lithography, and communication, etc.

A method for fabricating a nonlinear optical waveguide with gradient refractive index distribution, in which a nonlinear optical crystal is prepared; a type of first heavy ions, a type of second heavy ions and parameters related to an irradiation process are determined; the first heavy ions are accelerated to generate a first ion beam; the nonlinear optical crystal is bombarded with the first ion beam to obtain a primary processed crystal; the second heavy ions are accelerated to generate a second ion beam; the primary processed crystal is bombarded with the second ion beam to obtain a secondary processed crystal; and the secondary processed crystal is segmented to obtain the desired optical waveguide.

Various approaches can be used to interrogate a surface such as a surface of a layered semiconductor structure on a semiconductor wafer. Certain approaches employ Second Harmonic Generation while other utilize four wave-mixing or multi-wave mixing. Corona discharge may be applied to the sample to provide additional information. Some approaches involve determining current flow from a sample illuminated with radiation.

The present disclosure is directed, in general, to (1) nonlinear optical (NLO) chromophores, including (2) compositions / materials / resistive layers comprising NLO chromophores, and the methods of making the compositions / materials / resistive layers comprising NLO chromophores (e.g., methods of poling and / or drying, and the like), (3) uses of NLO chromophores in electro-optic devices (e.g., electro-optic modulators (EOMs)). NLO chromophores disclosed herein not only have large EO effect, but also have fast modulation speed. In addition, NLO chromophores disclosed herein have superior refractive index, photostability and thermal stability compared to other EO Materials. As a consequence, NLO chromophores herein are particularly suited for use as EO materials in connection with low power and small footprint devices, including devices used in data acquisition systems, analog I / O modules, field transmitters, lab and field instrumentation, servo drive control modules, direct current (DC) power supply, alternating current (AC), and / or electronic load.

The present invention relates to a nonlinear optical converter (11) for a laser radiation source which comprises a pump laser for generating a pump laser beam, the nonlinear optical converter comprising: a first optical parametric oscillator (OPO) crystal (2) which faces the pump laser and which is designed to generate, from the pump laser beam (6), a first pair of gain bands, in particular a signal band and an idler band, as well as residual pump radiation, and which has a first phase-matching angle (7); and a second optical parametric oscillator (OPO) crystal (3) which is arranged downstream of the first optical parametric oscillator (OPO) crystal (2) and is designed to generate, from the residual pump radiation, a second pair of further gain bands, in particular a signal band and an idler band.

The application belongs to the technical field of nonlinear optics, and particularly relates to a nonlinear perfect vector beam generating element, a preparation method and application. The element comprises a first glass substrate, a first light-controlled orientation layer, a ferroelectric nematic liquid crystal layer, a second light-controlled orientation layer and a second glass substrate. The first glass substrate and the second glass substrate are oppositely arranged. The first glass substrate and the second glass substrate are further respectively provided with the first light-controlled orientation layer and the second light-controlled orientation layer. The first light-controlled orientation layer and the second light-controlled orientation layer are provided with a nonlinear perfect vector beam control pattern. The nonlinear perfect vector beam control pattern controls liquid crystal molecules in the ferroelectric nematic liquid crystal layer to be periodically distributed in concentric circular rings. The application realizes the integration and miniaturization of the nonlinear perfect vector beam device and the one-step direct generation of the nonlinear perfect vector beam through the direct orientation of the liquid crystal electric dipole.

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.