614 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.

The invention relates to the technical field of laser ranging, in particular to a high-precision real-time distance calculation method based on a double-optical-comb laser ranging system. The high-precision real-time distance calculation method based on the double-optical-comb laser ranging system comprises the following steps: generating a double-optical-comb laser signal: generating the double-optical-comb laser signal by using a nonlinear optical effect, and dividing the double-optical-comb laser signal into two beams of light through an optical element for transmitting and receiving respectively; and transmitting the light signal: transmitting the transmitted light beam to a target object through an optical fiber or a free space. According to the invention, by adopting the double-optical-comb laser signals and combining real-time calculation of phase difference and frequency information, the distance measurement precision is obviously improved, the measurement precision of a submillimeter level can be achieved, and meanwhile, through real-time signal processing and a dynamic feedback mechanism, measurement requirements under different environmental conditions can be rapidly adapted; the timeliness and accuracy of a measurement result are ensured, and the dynamic measurement requirement is met.

Nonlinear optical chromophores having one or more diamondoid groups covalently attached to the chromophore, methods of making nonlinear optical chromophores, their use in thin films and electro-optical devices containing such nonlinear optical chromophores and thin films comprising the same.

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.

An all-optical neural network that utilizes light beams and optical components to implement layers of the neural network is disclosed herein. The all-optical neural network includes an input layer, zero or more hidden layers, and an output layer. Each layer of the neural network is configured to simulate linear and nonlinear operations of a conventional artificial neural network neuron on an optical signal. In an embodiment, the optical linear operation is performed by a spatial light modulator and an optical lens. The optical lens performs a Fourier transformation on the set of light beams and sums light beams with similar propagation orientations. The optical nonlinear operation is implemented utilizing a nonlinear optical medium having an electromagnetically induced transparency characteristic whose transmission of a probe beam of light is controlled by the intermediate output of a coupling beam of light from the optical linear operation.

The invention discloses an ultrafast coherent Raman spectrometer based on quantum entanglement photon enhancement and a light path device thereof, which realize ultrafast and high-resolution detection of a molecular vibration mode through integration of a quantum light source assembly, an ultrafast laser assembly, a light path assembly and a nonlinear crystal assembly and a high-sensitivity detection technology. By utilizing the characteristics of quantum entangled photons, the sensitivity and resolution of spectral measurement are improved, the system structure is simplified, and the cost is reduced. The quantum light source assembly adopts a nonlinear optical crystal to perform parametric down-conversion to generate entangled photon pairs. The ultrafast laser assembly generates femtosecond pulses, and the femtosecond pulses and the entangled photon pairs carry out nonlinear interaction. The light path assembly accurately controls the path and polarization state of photons to realize nonlinear Raman scattering of sample molecules. And the high-sensitivity detector is used for detecting and measuring the Raman light signal scattered by the sample. The invention aims to provide a spectral analysis method with high time resolution and high spectral resolution so as to realize ultrafast and high-resolution detection of a molecular vibration mode. According to the spectrograph, by utilizing the characteristics of quantum entangled photons, through entangled photon pairs generated by the nonlinear optical crystal, the sensitivity and resolution of spectral measurement are improved, and the problem of balance between time and spectral resolution in the prior art is solved.

The invention discloses a full-automatic intelligent multifunctional high-order nonlinear fluorescence dynamics testing method and device, and relates to the field of nonlinear optics and nano photonics. An optical testing device composed of an exciting light generation module, an automatic power regulation module, an exciting light modulation module, a sample scanning module, a data acquisition and analysis module and an intelligent control module is established, and under the excitation of incident laser, based on the overall coordination of the intelligent control module, the optical testing device is established. Other modules are driven to complete the dynamic response test of a nonlinear fluorescence sample, and full-automatic intelligent, multifunctional, high-precision, simple, efficient, low-cost and universal fluorescence dynamic test analysis is realized. The problems that traditional manual operation wastes time and labor and the testing precision is low are solved. In addition, the multifunctional integration of the fluorescence response curve, the fluorescence rise time, the fluorescence lifetime and the fluorescence imaging effectively improves the test efficiency and the application scene, and greatly reduces the system cost.

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 relates to an erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal as well as a preparation method and application thereof, and belongs to the field of nonlinear optical crystals. The erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal provided by the invention is prepared from Li2CO3, Nb2O5 and Er2O3 and / or Yb2O3 with the purity of 99.99%; wherein the atomic molar ratio of Li to Nb is 0.80-0.92, and the doping molar fraction of Er2O3, the doping molar fraction of Yb2O3 and the total doping molar fraction of Er2O3 and Yb2O3 are respectively 0.75%-1.25%. The erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal prepared by the invention is high in crystallization quality, large in doping concentration, uniform and transparent as a whole and free from obvious macroscopic defects, and can be used for preparing a high-quality lithium niobate bulk material and a submicron lithium niobate film so as to further prepare high-efficiency photoelectric functional devices such as a laser, an amplifier and a detector; and a foundation is laid for development of the fields of integrated photonics and the like.

The invention relates to a compound selenium-indium-cesium and a selenium-indium-cesium infrared nonlinear optical crystal as well as a preparation method and application thereof. The molecular formula of the compound is CsIn5Se8, the molecular weight is 1338.69, the molecular formula of the crystal is CsIn5Se8, the molecular weight is 1338.69, the structure has an asymmetric center and belongs to a triclinic system, the space group is P1, and the cell parameters are as follows: a is 9.1506 (3), b is 9.1793 (3), c is 11.2778 (3), alpha is 89.9560 (10) degrees, beta is 72.0140 (10) degrees, gamma is 72.0340 (10) degrees, Z is 2, and the volume is 852.38 (5) 3. The crystal is prepared by adopting a high-temperature melt method, a chemical vapor transport method, a Bridgman-Stockbarger method or a fluxing agent method. The obtained selenium-indium-cesium infrared nonlinear optical crystal has the advantages of large nonlinear optical response, good crystal growth habit, good mechanical property, difficulty in fragmentation and deliquescence, easiness in processing and storage and the like, and can be used for manufacturing infrared nonlinear optical devices; the method has important application in the fields of photoelectric countermeasure, spectrum technology, laser communication, remote sensing distance measurement and the like.

The invention discloses an ytterbium ion doped samarium calcium oxide borate nonlinear optical crystal and a preparation method and application thereof.The crystal belongs to a monoclinic system, an m point group and a Cm space group, the chemical formula is YbxSm1-xCa4O (BO3) 3, the chemical formula is 0.1-0.99, the cell parameters are as follows: a = 8.064-8.110, b = 16.045-16.062, c = 3.570-3.600, alpha = gamma = 90 degrees and beta = 100.80-101.38 degrees, and the ytterbium ion doped samarium calcium oxide borate nonlinear optical crystal has good crystal quality and transmittance as high as 87% and can be applied to high-power laser devices, such as laser devices, laser devices, laser devices and the like. The method is widely applied to the fields of photoetching machines, laser medical treatment, laser cutting and the like, and the preparation method has the advantages of being low in cost, high in quality, stable in performance, suitable for large-scale production and the like.

Provided herein are ferroelectric nematic (NF) compositions comprising a ferroelectric nematic host and one or more nonlinear optical compounds (chromophores).

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.

Aspects of embodiments pertain to an optical mapping device having non-linear optical characteristics. The device may comprise an optical unit that is configured to direct an optical signal from an input interface to an output interface of the optical unit. The device includes a substance causing the optical unit to attain saturable absorber characteristics such that absorption of an optical input signal guided from the input interface to the output interface by the optical unit decreases with an increase in optical signal intensity received by the optical unit. In some examples, the saturable absorber characteristics of the mapping device are selectively adaptable.

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.

Nonlinear optical chromophore compositions which display lyotropic nematic liquid crystal phases in polar organic solvents and provide a mechanical anisotropic effect allowing for the formation of a non-centrosymmetric chromophore-polymer matrix without the application of an electric field.

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 discloses a silicon substrate-chalcogenide glass-plasmon hybrid integrated waveguide structure and a preparation method thereof, and belongs to the technical field of integrated optics, the silicon substrate-chalcogenide glass-plasmon hybrid integrated waveguide structure comprises an SOI substrate, a dielectric layer is arranged on top silicon of the SOI substrate, metal and chalcogenide glass are arranged on the dielectric layer, a plasmon slit waveguide structure is formed between the metal, and the chalcogenide glass is arranged between the metal and the plasmon slit waveguide structure. The end parts of the metal slit are respectively connected with the end parts of different chalcogenide glass, and extend outwards along the extension line of the slit to form a chalcogenide glass-metal slit-chalcogenide glass structure. Silicon-based-chalcogenide-plasmon waveguides are combined, the tolerance of an overlay process is increased in an interlayer mode conversion mode, the transmission loss of the plasmon waveguides is improved in a silicon-based-plasmon mixed waveguide mode, the robustness of the device is improved, and the device functions of low loss and high mode conversion efficiency are achieved. And the application of the plasmon integrated optical waveguide device in hybrid integrated optoelectronic devices and nonlinear optical regulation and control is promoted.

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.

A semiconductor laser and a photonic nonlinear circuit chip are integrated together. The nonlinear circuit chip may include a nonlinear waveguide configured or controlled to enable sum-frequency generation, difference-frequency generation, second-harmonic generation, parametric amplification, or other nonlinear processes. Coupling between the semiconductor laser and the nonlinear circuit may be optimized by mode-matching, while back-reflections are minimized by diverting the reflections so that optical isolators are not needed. The integration of the semiconductor laser and the nonlinear photonic circuit chip enables nonlinear optical processing using a compact and scalable platform in a flexible manner that is compatible with different types of semiconductor lasers and different operation regimes. An additional input is provided so users can input an optical signal into the photonic chip for processing therein. In some examples, the photonic chip is configured with pump resonators, such as racetrack resonators. Method and device examples are described herein.

The invention relates to the field of nano photonics and optical materials, in particular to an exciton state energy level detection method based on a plasmon enhanced nonlinear spectrum, which comprises the following steps: constructing a mixed nano cavity structure in which a single-layer two-dimensional material is coupled with a plasmon cavity; collecting a two-photon photoluminescence spectrum, a second harmonic spectrum and a third harmonic spectrum of the single-layer two-dimensional material in the mixed nanocavity structure; the intensity of a nonlinear optical signal is improved through a local enhancement effect of plasmons; according to the two-photon photoluminescence spectrum, the second harmonic spectrum and the third harmonic spectrum of the single-layer two-dimensional material, the dark exciton state energy level, the bright state energy level, the dark exciton state energy level and the high-energy exciton state energy level of the single-layer two-dimensional material are determined. According to the method, the energy level of the Rydberg exciton state of the semiconductor material with the nanoscale thickness can be accurately detected.

The invention provides a compound guanidine fluoroborate and a guanidine fluoroborate nonlinear optical crystal as well as a preparation method and application, the chemical formula of the compound is [C (NH2) 3] 3B3O3F6, the molecular weight is 370.66, a room temperature solution method is adopted, the molecular weight of the guanidine fluoroborate nonlinear optical crystal is 370.66, the crystal belongs to a monoclinic system, the space group is Pc, and the cell parameters are as follows: a = 8.5366 (10), b = 11.5066 (12), c = 9.2274 (9), alpha = 90 degrees, beta = 122.682 degrees and gamma = 90 degrees. And the unit cell volume is 762.883. And growing the crystal by adopting a room-temperature solution method or a hydrothermal method. The crystal has good chemical stability, and can be used as a short-wavelength nonlinear optical crystal in an all-solid-state laser.

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.

The invention relates to application of biguanide carbonate or biguanide nitrate as a nonlinear optical crystal, in particular to application of the biguanide carbonate or the biguanide nitrate as the nonlinear optical crystal to realize ultraviolet frequency doubling laser output. Through experimental tests, the frequency-doubled effect of the biguanide nitrate powder is about 3.5 * KDP, and the ultraviolet cut-off edge is about 318nm; the frequency-doubled effect of the biguanide carbonate powder is about 5 * KDP, the ultraviolet cutoff edge is about 258 nm, and compared with the frequency-doubled effect of the guanidine phosphate which is 1.5 * KDP, the second-order nonlinear optical performance of the biguanide carbonate and the biguanide nitrate is greatly improved; the two crystals are stable in air and high in product purity, and compared with a layered growth habit of a potassium boron beryllium fluoride crystal, the growth speed is high, a large-size transparent single crystal is easy to grow, and the two crystals can be applied to an all-solid-state laser as ultraviolet and ultraviolet solar-blind nonlinear optical crystals.