826 results about "Quasi-crystals" patented technology

The invention belongs to the field of prediction of fatigue failure caused by surface defects under rolling contact loads, and particularly relates to a rolling contact fatigue pitting corrosion prediction method considering crystal plasticity, a corresponding computer readable storage medium and electronic equipment. The method comprises the following steps: S1, constructing a crystal plastic constitutive model of a coupling damage accumulation theory; s2, developing the model in the step 1 into a UMAT subprogram by using Fortran, and embedding ABAQUS into the UMAT subprogram; s3, establishing a representative volume element crystal plastic finite element model; s4, applying a periodic boundary condition and a shear load, obtaining a shear stress-strain curve, carrying out a torsional fatigue test, obtaining fatigue damage parameters of the material, and determining constitutive model parameters of the material; s5, establishing a crystal plastic finite element model of the roller and raceway contact pair; s6, applying boundary conditions in two steps; and S7, observing a damage evolution path to the surface, and obtaining the rolling contact fatigue pitting corrosion life. The method can fill the blank of rolling contact fatigue pitting corrosion prediction methods at present.

The invention relates to the technical field of force sensors, and discloses a nonlinear decoupling method and system for a three-axis force sensor, and the method comprises the steps: collecting multi-dimensional original data, and carrying out the adaptive noise reduction, dynamic selection of a wavelet basis, and construction of a filtering matrix, and obtaining a noise reduction signal through calculation; constructing a dynamic PINN proxy model, fusing material parameters and environment parameters, outputting a stiffness matrix, establishing an online parameter updating mechanism, calculating the obtained optimization parameters, and constructing an enhanced dynamic compensation matrix; the output stiffness matrix and the enhanced dynamic compensation matrix are fused, and a main singular value is reserved; reconstructing to obtain a reconstructed strain field, establishing a multi-physics field coupling model to compensate quantum-thermal coupling errors, and compensating wire inductive coupling under high frequency; constructing a multi-scale graph structure, strengthening a loss function through physical constraint, performing crystal plasticity hysteresis compensation, fusing multi-scale features, and calculating and outputting a decoupling force value; and an intelligent calibration decision is established, the drift trend is predicted, and the calibration period is dynamically adjusted.

A positron emission tomography (PET) scanner includes a plurality of gamma radiation detector modules arranged to form a detector ring. Each detector module includes an array of scintillator detectors. Each scintillator detector comprises a monolithic scintillation crystal and a plurality of photodetector arrays, such as silicon photomultipliers (SiPMs). A photodetector array is positioned on at least two nonparallel faces of each scintillation crystal. In some examples, a photodetector array is positioned on each of three orthogonal faces of each scintillation crystal.

The invention relates to the technical field of topological photonic crystals, in particular to a topological energy valley photonic crystal, a broadband topological slow light waveguide and a topological beam splitter. The crystal comprises a substrate and a nanorod array arranged on the substrate, the nanopillar array is formed by arranging a plurality of unit cells with honeycomb structures, and the two-dimensional cross section of each unit cell is a regular hexagon; each unit cell is formed by arranging two kinds of nano columns with different section diameters at intervals; two adjacent unit cells share one edge; the two nano columns with different section diameters are respectively a first nano column and a second nano column, and the diameter of the first nano column is twice that of the second nano column; and the value range of the lattice constant a is 480-520 nm. The method has the advantages that the problem of broadband slow light regulation and control in the topological optical waveguide is solved; brillouin region winding of an energy valley boundary state mode is realized, and the group velocity of a light mode is reduced; the light transmission robustness is improved; the back scattering loss caused by manufacturing defects and disorder is reduced; and the applicable frequency range of the device is widened.

The invention provides a patterned photonic crystal laser and a preparation method thereof, the laser comprises a substrate, and a first mask layer, a photonic crystal layer and a second mask layer which are sequentially deposited on the substrate, a light emitting area is etched in the central area of the second mask layer, and transparent conductive layers are deposited on the surface of the second mask layer and the light emitting area; a p-annular electrode is arranged on the surface of the transparent conductive layer on the second mask layer, and an n-annular electrode is arranged below the substrate; the photonic crystal layer is composed of a nanorod array and a polymer filled in gaps of nanorods; holes distributed in a patterned array are etched in the surface of the first mask layer, and nanorods are epitaxially grown in hole areas; the nanorod is formed by sequentially depositing a substrate contact layer, a first waveguide layer, a multi-quantum well layer, a second waveguide layer, a coating layer and a component gradient layer. According to the invention, through collaborative design optimization of all the layers, emission of laser with specific wavelength and preparation of a laser emitting laser with single longitudinal mode, narrow linewidth and stable wavelength are realized.

The invention relates to the technical field of laser preparation, and provides a photonic crystal surface emitting laser and a preparation method thereof. The preparation method comprises the following steps: sequentially growing an n-type doped layer, a p-type independent limiting layer and a p + / n + tunnel junction on a GaAs substrate; preparing a patterned mask structure on the p + / n + tunnel junction; the patterned mask structure comprises a plurality of preset patterns; etching the p + / n + tunnel junction according to a preset pattern to obtain a plurality of photonic crystals; sequentially growing an n-type coating layer, an undoped active layer and a p-type coating layer on the photonic crystal; growing a p-type electrode on the p-type coating layer; and growing an n-type electrode on the GaAs substrate. According to the preparation method, the SHB problem can be effectively solved, the multiple photonic crystals can be arranged in different modes to form a pattern capable of achieving the needed light emitting mode, light emitting in all directions can be achieved, the requirements for different light emitting characteristics of the photonic crystal surface emitting laser are met, and the use performance of the laser is guaranteed.

Optical device films and methods of forming optical device films having a RMS surface roughness less than about 2.2 μin and a refractive index greater than 2.0 are provided. In one embodiment, an optical device film is provided and includes a crystalline or nano-crystalline material having a refractive index greater than 2.0. A top surface of the optical device film has a root-mean-square (RMS) surface roughness less than about 2.2 microinches (μin).

The invention discloses an all-solid-state debugging-free slab laser based on an orthogonal Porro prism, and belongs to the technical field of solid laser. The diode stack array is used as a pumping source; the pumping shaping system performs homogenization shaping on the slow axis direction of the diode stack array; the coupling cavity mirror introduces the shaped light field into the lath laser crystal, and is used as an oscillation laser reflector at the same time; the ridges of the first Porro prism and the second Porro prism are mutually orthogonal; a light field introduced into the slab laser crystal reaches the first Porro prism through the polaroid, enters the coupling cavity mirror through the polaroid after being reflected, is subjected to repeated reciprocating oscillation on the end face where the coupling cavity mirror is located and the end face where the first reflector and the second reflector which are longitudinally arranged are located to reach the second Porro prism, and then returns to the first Porro prism along the original path; and the light is output by the polaroid. Large single pulse energy can be output based on a single resonant cavity, cascade amplification is not needed, the system size compactness is very high, and the photoelectric conversion efficiency is high.

The invention discloses an ultra-wide-band tunable intermediate infrared laser device and a light beam pointing stabilizing method. The device comprises a fundamental frequency pumping source, an ultra-wide tuning annular resonant cavity, a nonlinear frequency conversion crystal, a laser wavelength tuning controller and a light beam pointing stabilizing controller. The fundamental frequency pumping source is used for providing pumping laser for high-peak power pulse emission, the ultra-wide tuning annular resonant cavity adopts a special special-shaped angle design, a high-refractive-index intrinsic substrate is used as an input and output coupling mirror, and the pumping laser enters the high-refractive-index intrinsic substrate at a Bronsted angle and enters the resonant cavity through coupling of the high-refractive-index intrinsic substrate; at least two cavity mirrors in the resonant cavity mirror are gold mirrors highly reflecting near-infrared and middle-infrared bands, the pump light passes through the nonlinear frequency conversion crystal and forms a closed-loop light path in the resonant cavity, efficient optical parametric oscillation is achieved, and middle-infrared laser with an extremely wide wavelength tuning range is generated. And the light beam pointing stabilization controller controls the resonant cavity mirror to compensate light beam pointing deviation, so that continuous wavelength tuning is realized, and the light beam pointing is kept unchanged.

The invention discloses a multilayer film compatible with H, K, medium-wave infrared and long-wave infrared band stealth and radiation heat dissipation. Comprising a substrate, a metal reflection layer, a photonic crystal layer fused with a loss medium and an H and K wave band antireflection layer, the absorption rate of H and K wave bands is larger than 0.5, the emissivity of medium wave infrared and long wave infrared bands is lower than 0.5, and the emissivity of very long wave infrared bands is larger than 0.5; the photonic crystal layer fused with the loss medium is of a multi-layer structure and is formed by alternately stacking dielectric layers made of various high-refractive-index dielectric materials and dielectric layers made of various low-refractive-index dielectric materials. The multilayer film provided by the invention has effective radiation heat dissipation and heat management capabilities while realizing stealth on solar radiation and heat radiation, and can be widely applied to the fields of aviation, aerospace and the like.

The invention discloses an ultra-wideband femtosecond optical parametric oscillator capable of being quickly tuned, and relates to the technical field of optical parametric oscillators. The oscillator comprises a frequency doubling device, an optical parametric oscillator resonant cavity device and a dispersion compensation chirp mirror pair module. According to the invention, the original phase matching bandwidth is further broken through by adopting a non-collinear phase matching mode that the transmission included angle between the pump light and the signal light is 2.5 degrees, and rapid wavelength tuning can be realized only by finely tuning the cavity length under the condition that the angle of the nonlinear crystal is not adjusted; the broadband tunable optical parametric oscillator can break through the bottlenecks in the aspects of wavelength tuning range, wavelength tuning speed and the like of the existing near-infrared optical parametric oscillator, and provides a novel light source with larger wavelength tuning range and higher tuning speed for the fields needing broadband tunable light sources, such as spectroscopy, micro-nano processing, optical frequency combs and the like.

The invention relates to a thin film electro-optical crystal-silicon nitride heterogeneous integrated N * N high-speed optical switch array and a preparation method thereof. The thin film electro-optical crystal-silicon nitride heterogeneous integrated N * N high-speed optical switch array is formed by connecting 1 * 2 or 2 * 2 Mach-Zehnder high-speed optical switch units according to a certain topological structure. Wherein the high-speed optical switch unit is composed of a silicon nitride passive waveguide and a thin-film electro-optical crystal / silicon nitride heterogeneous integrated phase shift region. Comprising but not limited to thin-film lithium niobate, thin-film lithium tantalate, barium titanate and lead zirconate titanate is integrated above the silicon nitride phase shifting arm through a micro transfer printing method to form a heterogeneous integrated phase shifting region. The large-scale high-speed optical switch array with excellent performance is realized by combining the characteristics of ultra-low loss, CMOS compatibility, thermal stability and the like of a silicon nitride material, the characteristics of low power consumption, low loss, high-speed modulation and the like of a thin film electro-optical crystal and the advantages of high flexibility, parallel integration, low cost, low loss and the like of a micro transfer printing method.

An example system includes a first steering layer interposed between an electromagnetic (EM) source and an emission lens. The first steering layer includes a triplet lens having a Plano-convex lens, a Plano-concave lens, and an electro-optical (EO) crystal positioned between the lenses. The EO crystal includes transparent electrodes on each side, coupled to the respective lenslet and / or the EO crystal. The system includes the EM source providing an incident EM beam on the first steering layer, and the emission lens emitting a steered EM beam to a target location.

The invention provides a system and a method for automatically optimizing the power of a frequency doubling laser, and relates to the technical field of laser. The high-temperature frequency doubling furnace comprises an LBO crystal and a heating sheet, the LBO crystal is used for carrying out high-temperature frequency doubling on laser emitted by the infrared laser, and the heating sheet is used for heating the LBO crystal; the dichroic mirror is used for transmitting the frequency-doubled laser and reflecting and filtering the non-frequency-doubled laser; the spectroscope is used for dividing the frequency-doubled laser into reflected light and transmitted light; the power meter is used for measuring the power of the reflected light; and the temperature controller is used for controlling the heating plate to heat the LBO crystal according to the reflected light power fed back by the power meter so as to adjust the temperature of the LBO crystal and enable the power of the reflected light to fluctuate within a preset range. According to the method, the frequency doubling power of the laser subjected to high-temperature frequency doubling through the LBO crystal can be kept stable and is not influenced by environment temperature fluctuation.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

The invention relates to a measuring head comprising an insulating body (IK), a first and second end fitting (EB1, EB2) with fastening means (BFE) for a line (LTG), and a sensor element (SE). The sensor element (SE) comprises a carrier material (TM), one or more crystals comprising paramagnetic centers (NV1), and a first and second optical waveguide (LWL1, LWL2), which may be identical to one another. The sensor element (SE) is mechanically connected to the first end fitting (EB1), which has fastening means (BFE) for fastening the line (LTG). The second end fitting (EB2) has means for fastening the first and / or second optical waveguide (LWL1, LWL2) to the first and / or second end fitting (EB2), respectively. The first and / or second optical waveguide (LWL1, LWL2) are guided within the insulating body (IK) in an electrically insulated manner from the first (EB1) to the second end fitting (EB2). The first end fitting (EB1).The first optical fiber (LWL1) and / or the second optical fiber (LWL2) are attached to the first end fitting (EB1). The second optical fiber (LWL2) detects fluorescent radiation (FL) from the sensor element (SE), while the first optical fiber (LWL1) transports pump radiation (LB) through the insulating body (IK) to the sensor element (SE) and irradiates the sensor element (SE) with pump radiation (LB). When irradiated with pump radiation (LB), the paramagnetic centers (NV1) of the sensor element (SE) emit fluorescent radiation (FL), which depends on the magnetic flux density B at the location of the sensor element (SE).

A nonlinear crystal flexible clamping and temperature control device comprises a clamping seat, a top face clamping block, a side face clamping block, a stud, a compression spring, a nut, a window mirror pressing ring, a wave spring, a window mirror gasket, a window mirror, a window mirror limiting block, a nonlinear crystal, silicon rubber, a thermistor and a ceramic heating piece. The flexible clamping device exerts pre-tightening force on the nonlinear crystal in the horizontal direction and the vertical direction through the compression spring, and meanwhile flexible clamping of the nonlinear crystal is achieved in a silicone rubber dispensing fixing mode. The temperature control device achieves accurate control over the temperature of the nonlinear crystal in the mode that a thermistor collects temperature signals and a ceramic heating piece heats a clamping base. The flexible clamping and temperature control device disclosed by the invention has the characteristics of performing thermal expansion compensation on the nonlinear crystal, being high in mechanical resistance and temperature control precision, uniform in crystal heat distribution and the like.

This invention relates to a Bragg light generation system and method suitable for Bragg-type atomic interferometers. The system includes: a laser for generating a first laser beam with a frequency in a preset atomic absorption peak band; an optical circulator for propagating the first laser beam to a cascaded acousto-optic modulator and receiving two third laser beams returned from the cascaded acousto-optic modulator; a cascaded acousto-optic modulator for diffracting the first laser beam into two second laser beams with opposite propagation directions through Bragg diffraction of two acousto-optic crystals; an optical assembly for performing secondary diffraction on the two second laser beams and reflecting the two mutually perpendicular second laser beams to the cascaded acousto-optic modulator; and an output module for splitting and sampling the two third laser beams and modulating the sampled third laser beams into Bragg laser beams in the target frequency band. This invention reduces the path separation of the two Bragg laser beams by using a quasi-common optical path, thereby reducing phase noise and improving measurement accuracy.

The invention discloses a dynamic tunable zero-level electro-optical wave plate system, a device and a preparation method, and belongs to the technical field of optical devices. The invention provides a dynamic tunable zero-order electro-optical wave plate system, and the system comprises a zero-order electro-optical wave plate device which comprises a wave plate substrate made of an electro-optical crystal of a non-centrosymmetric structure, and an electrode disposed on the wave plate substrate; the output end of the adjustable voltage source is electrically connected with the electrode; wherein the adjustable voltage source is configured to be capable of outputting a half-wave working voltage corresponding to a target working wavelength, so that the zero-order electro-optical wave plate device works at the target working wavelength as a half-wave plate. According to the invention, self-adaptive matching of a single device to a plurality of working wavelengths is realized, the problem that the working wavelength of the device is single due to material dispersion is solved, and meanwhile, the processing difficulty of an ultrathin structure required by a specific wave band is avoided.

The invention belongs to the technical field of optical glass, and discloses an optical glass structure with a high-hardness scratch-resistant coating, which comprises the following structures: a chemically strengthened glass substrate; the refractive index gradient transition layer is deposited on the surface of the substrate; and the diamond-like carbon-based hard coating covers the surface of the transition layer. The defect is thoroughly overcome through a gradient strengthening system, the diamond-like carbon coating resists invasion of external abrasion particles through a crystal bonding network close to absolute hardness, so that the surface microhardness breaks through the upper limit of a brittle material, the gradient transition layer constructs an elastic buffer strip below the coating, impact stress is dissipated through the porous nano laminated layer, and the hardness of the coating is improved. The cooperation of the two ensures that no visible scratch is generated on the glass surface even if the glass surface is exposed to a high-wear environment for a long time, thereby fundamentally blocking linkage failures such as light path scattering, imaging blurring and dispersion imbalance caused by surface damage, and ensuring that the light transmittance of a precise optical system in the whole life cycle is stabilized at a theoretical extreme value.

This invention provides a method for manufacturing a photoelectric conversion element with improved photoelectric conversion efficiency. This method for manufacturing a photoelectric conversion element having a first electrode, a photoelectric conversion layer including a crystal of a perovskite structure, a charge transport layer, and a second electrode includes a step for forming the charge transport layer by applying a charge transport layer coating liquid on a surface of the photoelectric conversion layer, the method being characterized in that the charge transport layer coating liquid includes an alcohol liquid, resin, and charge transport particles.

A pumping module of a VCSEL side-pumped solid-state laser and a corresponding solid-state laser. The pumping module uses a design of pumping in an even number of directions, achieves a symmetrical pumping cavity and a mutual reflection chamber, and improves pumping light distribution uniformity. By means of the high reflectivity characteristic of surfaces of VCSEL chips (2) and a packaging substrate and a heat sink (1) therefor, a design in which no independent reflection chamber is provided and the heat sink (1) is integrated is realized, the structure is simplified, and the symmetry of light spots is improved. In addition, a cooling pipe (4) having a frosted outer surface is introduced, so that the uniformity of light beams is further improved by means of a diffusion mechanism, and reflection on the surfaces of the VCSEL chips (2) is used to compensate for possible loss, thereby ensuring that optical-to-optical efficiency is almost unchanged. By using an eccentric pumping structure and an optimized wavelength distribution of the VCSEL chips (2), the absorption uniformity of a crystal rod (200) is further improved; and the uniformity of light beams can be effectively improved, especially when the diameter of the crystal rod (200) is large. The present invention has the advantages of a simple structure, stable performance and good light spot symmetry.

The invention discloses a superconducting nanowire single-photon detector based on an optical Tamm state. The superconducting nanowire single-photon detector is composed of an upper-layer photonic crystal I, a superconducting nanowire winding at an interface, a lower-layer photonic crystal II and a substrate from top to bottom. The photonic crystal is formed by periodically overlapping and arranging two dielectric layers with a high refractive index and a low refractive index respectively; the crystal I and the crystal II are two different types of photonic crystals, the contact dielectric layers of the two types of photonic crystals are respective high-refractive-index layers, and the two high-refractive-index layers are made of different materials; the thickness of each dielectric layer in the photonic crystal is 1 / 4 of the equivalent wavelength of incident light in the dielectric layer; the period number of the upper-layer photonic crystal I is 3-6; the period number of the lower-layer photonic crystal II is 8-14; when light enters from the front side, the optical Tamm state is excited at the interface of the two different photonic crystals. Due to the optical Tamm state at the interface of the two photonic crystals, the superconducting nanowire single-photon detector has the performance of narrow-band high absorption and polarization insensitivity.

The invention discloses an air-cooled miniature slab laser based on double-end pumping, and belongs to the technical field of solid laser. Wherein the first conduction cooling single bar and the second conduction cooling single bar are arranged at the upper end and the lower end of the lath laser crystal in a staggered manner to form a double-end pumping structure; after the first fast axis collimation cylindrical lens and the second fast axis collimation cylindrical lens respectively collimate the fast axis directions of the first conduction cooling single bar and the second conduction cooling single bar, partial end surfaces are injected into the lath laser crystal; the first resonant cavity reflector and the second resonant cavity reflector are located at the left end and the right end of the lath laser crystal; the laser injected into the slab laser crystal passes through the resonant cavity mirror and then is subjected to multi-pass back-and-forth oscillation between the first resonant cavity reflector and the second resonant cavity reflector to reach the resonant cavity output cavity mirror. The output monopulse energy is greatly improved, the overall electro-optical efficiency is high, and the system compactness is high.

The invention discloses a method for optimally designing and selecting a resonance aggregate and a resonance aggregate ratio by utilizing a finite element result. The method comprises the following steps: (1) setting a band gap range threshold value M and a vibration acceleration threshold value P; (2) preliminarily generating a resonance aggregate structure according to a design target; (3) inputting the generated resonant aggregate structure into finite element software, and calculating a cellular energy band structure of the multi-resonant aggregate concrete photonic crystal; (4) if the band gap range of the energy band structure of the multi-resonance aggregate concrete photonic crystal cell is larger than M, repeating the steps (2)-(4); (5) calculating the ratio; (6) establishing a multi-resonance aggregate concrete phononic crystal concrete structure according to a design target; and (7) outputting according with the matching requirement. According to the method for optimally designing and selecting the resonance aggregate and the resonance aggregate ratio by utilizing the finite element result, by virtue of the advantages of the photonic crystal metamaterial, a reasonable vibration reduction structure form is explored and constructed, the vibration of an engineering structure is effectively reduced, and the construction cost is reduced.

The invention provides an automatic device and method for light emitting and power optimization of 2-micron solid laser. The automatic device comprises a laser pumping source, a plano-convex lens group, a gain medium, a confocal resonant cavity, an output coupling mirror, a five-degree-of-freedom electric displacement table and a regulation and control system. Automatic optimization and stable output of laser power are realized through the design of an asymmetric confocal resonant cavity and micron-order adjustment of a high-precision five-degree-of-freedom electric displacement table in combination with a tolerance optimization algorithm and a gradient descent spiral search algorithm. A thulium-doped CYA disordered crystal is adopted as a gain medium, and the angle of the thulium-doped CYA disordered crystal is adjustable so as to excite a high-order vortex The transmittance of the output coupling mirror is dynamically adjusted according to the working mode, and the intra-cavity power density and the light-to-light conversion efficiency are ensured. The invention has the advantages of high efficiency and stability, strong universality, low cost, diversified output and the like, is suitable for the fields of space communication, quantum optics, laser processing and the like, and obviously improves the performance and application range of the laser.

The invention relates to a signal amplification device and system for photoacoustic spectrometry, and relates to the technical field of photoacoustic spectrometry, and the device comprises a buffer which is connected with a crystal resonator and is used for receiving a photoacoustic spectrometry signal emitted by the crystal resonator, and outputting a first amplification signal according to the photoacoustic spectrometry signal; the instrument amplifier is connected with the buffer and is used for receiving the first amplified signal, providing a common-mode rejection ratio and outputting a second amplified signal based on the first amplified signal and the common-mode rejection ratio; and the digital control gain amplifier is connected with the instrument amplifier and the remote control end, and is used for performing gain adjustment in response to a remote control instruction sent by the remote control end, and outputting a third amplification signal as an amplified photoacoustic spectrum signal based on the adjusted gain and the second amplification signal. By adopting the device, the noise interference in the photoacoustic spectrum signal amplification process can be reduced.

The invention discloses a tunable narrow-band medium-wave infrared detection method based on up-conversion, and the method mainly comprises the steps: building a tunable narrow-band medium-wave infrared detection system, adjusting the power of signal light and pump light and the size of a beam waist, and controlling the temperature of a nonlinear crystal at a room temperature level to suppress the noise of a static system. A nonlinear crystal is designed through displacement of a multi-polarization period of a mechanical motion module, so that quasi-phase matching of signal light and pump light in a range of 3-5 microns is realized in different polarization period channels, sum frequency light of a visible wave band is generated, and flexible tuning of the signal light in a wide spectral range is realized; after stray light is filtered out, a sum frequency signal is received by a detector, a corresponding curve is obtained according to detected intensity information corresponding to each wavelength, and narrow-band response characteristics of different polarization periods are obtained.

The invention provides a high-speed vertical-cavity surface-emitting laser preparation method and a high-speed vertical-cavity surface-emitting laser, and relates to the technical field of lasers, and the method comprises the steps: providing an epitaxial structure which comprises a substrate, a lower Bragg reflector and an active region, the top surface of the active region is provided with a first region, and a current expansion layer is formed on the first region; the substrate comprises a second area which is not covered by the lower Bragg reflector; forming a first dielectric film on the epitaxial structure; etching the first dielectric film above the current expansion layer to obtain a first window; etching the first dielectric film above the second area to obtain a second window; forming a first electrode in the first window; forming a second electrode in the second window; an upper dielectric Bragg reflector is arranged above the first electrode, and a plurality of photonic crystal air holes extending downwards are formed in the top surface of the upper dielectric Bragg reflector; and the depths of the photonic crystal air holes are gradually increased along the direction from the center of the upper dielectric Bragg reflector to the circumferential outer side of the upper dielectric Bragg reflector.

The invention discloses an automatic tuning and calibration method and system for a crystal resonator, and relates to the technical field of automatic control. Comprising the following steps: S1, generating a multi-physics field coupling matrix: constructing three-dimensional space distribution of an electromagnetic-mechanical-thermal coupling field through a quantum dot sensor array, and generating the multi-physics field coupling matrix; s2, determining a compensation amount: determining time-varying characteristic parameters in the magnetic component, the mechanical component and the thermal component, constructing a nonlinear multi-body coupling state equation, and determining the corresponding compensation amount; and S3, multi-dimensional cooperative compensation: respectively carrying out mechanical compensation, capacitance compensation and light-operated tuning, and carrying out cooperative compensation through multiple actuators. According to the method, modeling is performed through high-precision three-dimensional space distribution of multiple physical fields, and the interaction of electromagnetic coupling, mechanical coupling and thermal coupling is quantified through the obtained total coupling strength among the resonators, so that the defect that the multi-body effect is ignored in a traditional method is overcome.