487 results about "Nonlinear optical" patented technology

The invention belongs to the related technical field of lasers, and provides a high-power subnanosecond-nanosecond laser in order to solve the problems that the range adjustment and the application range of an existing laser are limited, and the structural stability needs to be improved. A modulation semiconductor seed source, an optical fiber pre-amplifier, a light beam isolation system, a high repetition frequency solid pre-amplifier, an acousto-optic modulator frequency reduction module and a multi-stage solid single-pass main amplifier are sequentially arranged along an optical path, continuous adjustable output of repetition frequency and pulse width is achieved, the adjustable range of the repetition frequency is 100 kHz to 1 MHz, the adjustable range of the pulse width is 100 ps to 10 ns, and the adjustable range of the pulse width is 100 ps to 10 ns. The laser power and the light beam quality are remarkably improved, and the method is suitable for the fields of high-precision micromachining, nonlinear optical research, medical cosmetology and the like.

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

The invention discloses a high-resolution semiconductor surface and interior flaw detection method and device based on a multi-photon nonlinear fluorescence effect, and relates to nonlinear optics and optical imaging semiconductor detection. The short-wave infrared light penetrates through a semiconductor to be detected, a surface or an internal defect to trigger scattering, the transmittance / reflectivity and the power are changed, the thin film containing the high-order nonlinear fluorescent nanoparticles is excited, the luminance generates magnitude order change, and the defect detection contrast ratio and the imaging resolution ratio are improved. Full-automatic control is achieved through an FPGA and LabVIEW, sub-images are automatically collected and spliced, and gray scale abnormal areas are analyzed to judge defect types and distribution. The optical imaging device comprises an exciting light generation module, a sample scanning module, a nonlinear fluorescent film imaging module and an intelligent control analysis module, realizes short-wave infrared light excitation and visible light-near infrared detection, and has the advantages of intelligence, high resolution, low cost and large-area full-automatic flaw detection. The method is suitable for large-scale semiconductor efficient flaw detection, gets rid of dependence on an infrared imaging camera, and reduces system cost.

A photonic-crystal resonator (PhCR) and associated methods of design and manufacture. The PhCR includes spontaneous optical-pulse generation and includes a ring whose geometry is correlated to a mode structure or dispersion of the PhCR while also taking into account a desired type of nonlinear optical output from the PhCR, such as an optical frequency comb, or a particular type of pulse. The PhCR includes a periodic nanopatterning on an inner radial wall of its ring and is able to spontaneously generate a nonlinear optical output. The nanopatterning of the inner radial wall is designed to form a desired output, such as one of a classic soliton pulse that has a sech type temporal profile, or a gaussian profile, or a sink pulse profile.

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.

In an optical device the light emitting unit emits first light and second light having different polarization states. The light generation unit generates third light on the basis of the first light and the second light whose phase difference has been adjusted by the phase adjustment unit. The first light and the second light are incident on a birefringent element. A control unit controls at least one of a temperature of the birefringent element and a voltage applied to the birefringent element. The light generation unit includes a nonlinear optical element generating the third light on the basis of at least one of the first light and the second light. The first light and the second light emitted from the birefringent element are incident on the nonlinear optical element of the light generation unit.

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.

An ultraviolet (UV) light source includes a light emitting element that is configured to generate light of a first frequency, a nonlinear optical element that is configured to receive the light of the first frequency from the light emitting element and generate UVC or far-UVC light of a second frequency from the light of the first frequency, and an output coupling element that is configured to selectively outcouple the UVC or far-UVC light from the nonlinear optical element as output light. Related light sources and fabrication methods are also discussed.

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.

The invention relates to a nonlinear optical crystal and crystal combined adhesive and a preparation method thereof. The nonlinear optical crystal and crystal combined adhesive comprises the following components in parts by weight: 40-70 parts of hydrogenated bisphenol A type acrylate monomer; 20 to 40 parts of a polyfunctional thiol compound; the core of the core-shell structure nanoparticles is ZrO2, the shell of the core-shell structure nanoparticles is SiO2, the particle size of the core is 20-50nm, and the thickness of a shell layer is 3-8nm; and 0.1 to 0.5 part of a coupling agent containing a phosphate group. Through accurate regulation and control of the ZrO2atSiO2 core-shell nanoparticles, the refractive index of the adhesive can be adjusted in a range of 1.65-2.10, and is highly matched with the refractive index 1.7-2.2 of nonlinear optical crystals such as KTP, BBO and LBO, so that the Fresnel loss of a bonding interface is reduced to be less than or equal to 0.5 dB / cm, the laser frequency conversion efficiency is remarkably improved, agglomeration is effectively inhibited by the core-shell structure of the nanoparticles, and the laser frequency conversion efficiency is improved. The light transmittance of a cured adhesive layer under common laser wavelengths such as 1064 nm, 532 nm and 355 nm is larger than or equal to 99.5%, the adhesive layer is suitable for a high-power laser system, by adding the quantum dot material, the refractive index matching of the specific wavelength can be further optimized, and the application scene is expanded.

The invention belongs to the technical field of biomedical detection, and discloses a Raman spectrum analysis device for quantitative detection of hematologic tumor markers, which comprises a blood collection centrifugal unit with a self-adaptive load regulation mechanism for monitoring blood density and components in real time, centrifugal force and time parameters are automatically adjusted according to the blood density and components; the optical fiber Raman spectrometer is provided with an automatic wavelength calibration system, and an ultrafast laser pulse transmitter and a high-sensitivity photon counting detector are integrated on the optical fiber Raman spectrometer. Raman scattering signals are enhanced by adopting a quantum entanglement light source and a nonlinear optical crystal; according to the invention, the detection capability on low-concentration tumor markers can be obviously improved. Due to the improvement, the device can accurately detect the existence of the tumor marker at the early stage of cancer, and powerful support is provided for early treatment of a patient.

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 invention discloses an on-chip spontaneous frequency conversion light source based on a semiconductor nanowire-silicon nitride waveguide structure, and belongs to the technical field of integrated optics and nonlinear optics. According to the light source, the high-nonlinearity characteristic of the semiconductor nanowire is utilized, and the semiconductor nanowire is embedded in the silicon nitride waveguide, so that the frequency up-conversion function which the silicon nitride waveguide does not have is realized. The light source structure comprises a silicon nitride waveguide serving as a light wave transmission channel, a semiconductor nanowire serving as a nonlinear medium core and a grating coupler integrated with the waveguide so as to realize efficient transmission of optical signals. The light source has the advantages of low power consumption, high integration level, easiness in butt joint with an existing optical fiber system and the like, and is suitable for an on-chip optoelectronic integrated system.

The invention belongs to the field of continuum bound states and metasurfaces in nanometer photonics, and discloses a dielectric metasurface for realizing stable high-Q-value BIC through eigenfield disturbance. The dielectric metasurface comprises a dielectric substrate, a plurality of dielectric resonance units and a dielectric wrapping layer, the plurality of dielectric resonance units are periodically arranged on the dielectric substrate, and all the dielectric resonance units are surrounded by the dielectric wrapping layer; the structures of the dielectric resonance units are the same, the whole dielectric resonance units are in a regular quadrangular prism shape, and a vertical round hole is formed in the middle of each dielectric resonance unit. The corresponding positions of the two sides of each dielectric resonance unit in the y-axis direction are each provided with a columnar notch, one notch is a semicircular notch, and the other notch is a semi-elliptical notch. The dielectric metasurface can realize continuum bound state BIC of a high-quality Q factor; the morphology changes on the two sides of the notch are equal, so that the overall structure has a constant effective refractive index, and resonance with stable wavelength is generated; and a way is laid for the application of a low-threshold laser, an ultra-sensitive optical sensor and nonlinear optics.

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.

The invention discloses a method for growing a large-size CLBO crystal by using a new fluxing agent, and belongs to the field of nonlinear optical crystals. The adopted new fluxing agent is Cs2O-Li2O-B2O3-YF3, and the large-size CLBO crystal can be obtained through growth by a high-temperature solution top oriented seed crystal growth method. According to the novel fluxing agent, the solution viscosity can be effectively reduced, and crystal defects are reduced; and the grown large-size CLBO crystal has the advantages of high transmittance, strong deliquescence resistance and the like, and can be used as a frequency doubling device of an ultraviolet laser.

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.

The invention provides an organic eutectic crystal with a pi-conjugate plane structure and application of the organic eutectic crystal. The molecular formula of the organic eutectic crystal is C88H104F12N8O16, the molecular weight of the organic eutectic crystal is 1757.79, and the cell parameters of the organic eutectic crystal are as follows: a is equal to 26.7952 (16), b is equal to 26.7952 (16), and c is equal to 11.9585 (11). The alpha is 90 degrees, the beta is 90 degrees, the gamma is 90 degrees, and the V is 8586.0 (13) 3. The organic eutectic crystal provided by the invention not only can meet the requirement of a blue light band CPL device by strong circular polarization emission at 468 nm, is suitable for the fields of three-dimensional display, encryption and anti-counterfeiting and the like, provides a space for regulating and controlling the light-emitting wavelength and the glum value, but also is suitable for the fields of laser frequency conversion devices, nonlinear optical sensors and the like due to the strong SHG characteristic of the eutectic crystal, and has a wide application prospect. Compared with a traditional inorganic SHG material, the organic eutectic structure has the advantages of being easy and convenient to prepare, light in weight, high in designability and the like.

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.