469 results about "Magneto optical" patented technology

The invention provides a welding defect identification method, system and equipment for an automobile part and a medium, and relates to the technical field of automobile welding.The method comprises the steps that a structured light vision sensor and a high-frequency ultrasonic sensor are used for obtaining three-dimensional structured light data of a to-be-welded area of the automobile part and sound wave signals generated in the welding process; obtaining characteristic frequency information used for identifying welding internal defects; the method comprises the following steps: capturing a heat distribution image of a to-be-welded area of an automobile part through a thermal imaging camera to obtain area feature information used for identifying welding defect thermal anomaly, and obtaining magneto-optical signal feature information used for identifying welding defects; performing defect identification and classification on the fused feature representation by training a deep learning model to obtain a defect identification result; and welding parameters are adjusted through a simulated annealing algorithm, so that the welding defects of the automobile parts are recognized. According to the invention, various welding defects can be identified, so that the accuracy and efficiency of welding quality detection are remarkably improved.

The invention provides an intelligent magneto-optical switch test system and method, and relates to the technical field of optical communication and photoelectric measurement and control, and the system comprises a control module which is used for receiving optical switch insertion loss sent by an acquisition module, and generating a driving signal through an MCU controller unit, so as to control a pulse driving circuit unit through the driving signal, a pulse signal is generated; the to-be-tested unit magneto-optical switch is used for receiving the pulse signal and controlling a corresponding magnetic circuit to switch off the switch and switch channels according to the pulse signal; and the power supply module is electrically connected with the acquisition module, the control module and the to-be-tested unit magneto-optical switch. The optical power of the laser is obtained and calibrated through the obtaining module, high-precision optical switch insertion loss calculation and independent calculation of all channels are achieved, data accuracy and reliability are ensured, the control module receives data in real time through the MCU and rapidly responds to optical power changes, rapid magnetic circuit switching operation is achieved through the pulse driving circuit, and the response speed is increased.

The invention discloses a magnetic induction intensity detection device based on laser self-mixing interference, which is characterized in that laser emitted by a laser is divided into two light paths after being split by an optical splitter; wherein a polarizing film, a magneto-optical crystal and a transducer are sequentially arranged on one optical path; the transducer is electrically connected with the control module, and the control module generates a continuous sine wave signal to continuously control the transducer; a detector is arranged on the other light path; the detector is electrically connected with the Fourier transform module, and the Fourier transform module analyzes a laser self-mixing interference signal acquired by the detector; the magneto-optical crystal is located in the magnetic field; laser emitted by the laser device is reflected for multiple times between the laser device and the transducer, and laser self-mixing interference is formed under the action of the polaroid. The laser is reflected for multiple times between the laser and the transducer, the Faraday optical rotation effect can be enhanced, the polaroid serves as the polarizer and the polarization analyzer, and the advantages that an external polarization analyzer is not needed, the measurement cost is reduced, and the sensitivity is improved are achieved.

A transparent ceramic material is manufactured by molding a source powder into a compact, the source powder comprising a rare earth oxide consisting of at least 40 mol % of terbium oxide and the balance of another rare earth oxide, and a sintering aid, sintering the compact at a temperature T (1,300° C.≤T≤1,650° C.) by heating from room temperature to T1 (1200° C.≤T1≤T) at a rate of at least 100° C. / h, and optionally heating from T1 at a rate of 1-95° C. / h, and HIP treating the sintered compact at 1,300-1,650° C. The ceramic material has improved diffuse transmittance in the visible region and functions as a magneto-optical part in a broad visible to NIR region.

According to the flexible array type external field program control nerve stimulation device, the preparation method and the application thereof, the flexible array type external field program control nerve stimulation device comprises a flexible substrate layer and a stimulation response fiber array layer, and the stimulation response fiber array layer is prepared from a functional material capable of converting external field energy such as ultrasound, magnetism and light into electric energy; the flexible substrate layer with high flexibility is adopted, so that the flexible substrate layer can be matched with the surface of a nerve target tissue in a conformal manner; the stimulation response fiber array layer integrated on the flexible substrate layer in an array arrangement mode can meet the stimulation spatial resolution of neuron and even sub-neuron precision, has the characteristics of excellent flexibility, biocompatibility, passivity and wireless performance, can provide nerve electrical stimulation signals with high spatial resolution, and can be applied to the field of nerve electrical stimulation. The high-resolution nerve electrical stimulation device can be in conformal fit with the irregular surface of nerve soft tissue, and is suitable for high-resolution nerve electrical stimulation of different parts such as eyes, the brain and peripheral nerves.

The invention discloses an OEO amplifier with a high-speed hard switching function and an optical transmission system, and relates to the technical field of optical amplifiers, the OEO amplifier comprises three magneto-optical switches, an optical splitter group, a photoelectric detector group, a real-time comparison circuit, a logic gate control circuit and a driving circuit; the photoelectric detector group collects optical signal power to generate an electric signal; the real-time comparison circuit performs voltage threshold judgment on the electric signal; the logic gate control circuit is connected with the output end of the real-time comparison circuit so as to synchronously control the switching states of the three magneto-optical switches according to a voltage threshold judgment result; the driving circuit is used for driving the magneto-optical switch to synchronously execute a switching action; when the OEO amplifier detects that optical signals in any direction are interrupted, all the magneto-optical switches finish synchronous switching within 100 microseconds, and the end-to-end optical signal switching time difference is smaller than 2 picoseconds. The method is suitable for a single-fiber bidirectional optical communication environment requiring high frequency, high precision and high stability.

The invention provides a magneto-optical measurement system which can be applied to the technical field of optical measurement. The system comprises a broadband light source, a broadband light source performance regulation and control module, a polarization-maintaining circulator, an optical phase modulation and demodulation module, a magneto-optical spectrum acquisition module and a signal detection module, an initial optical signal generated by the broadband light source is regulated and controlled by the broadband light source performance regulation and control module to obtain a stable optical signal, and the stable optical signal passes through the polarization-maintaining circulator and is transmitted to the optical phase modulation and demodulation module. The light enters the optical phase modulation and demodulation module and is modulated to generate an emergent light beam; the emergent light beam enters a magneto-optical spectrum acquisition module, and a reflected light beam on the sample is obtained after magneto-optical signal modulation; the reflected light beam passes through the optical phase modulation-demodulation module, interference is generated after demodulation, and an interference signal is generated; and the interference signal enters the signal detection module through the polarization-maintaining circulator and is recorded by the signal detection module, and a magneto-optical spectrum is generated.

The invention discloses a preparation method of a flexible magneto-optical composite material which is low in cost and easy to form, Fe3O4 or CoFe2O4 or NiFe2O4 nanoparticles which have a strong magneto-optical effect but are extremely easy to agglomerate are uniformly dispersed in ZIF-8 with fixed pores by adopting an in-situ symbiosis technology, and PgC5Cu is used for modifying the surface of the ZIF-8 to serve as a bridging agent, so that the ZIF-8 is uniformly dispersed in PMMA (Polymethyl Methacrylate); and the composite material with excellent magneto-optical characteristics is successfully constructed. The innovative design not only maintains the original structural stability and optical transparency of the material, but also endows the material with unprecedented flexibility and machinability, and provides possibility for realizing light weight, portability and flexibility of magneto-optical devices. Compared with traditional pure inorganic magneto-optical crystals, magneto-optical glass and other materials, the preparation method is simple, the production period is short, energy consumption and cost are remarkably reduced, and the material has the advantages of being easy to form, high in flexibility and the like and can adapt to wider application scenes.

An optical metrology device includes a selectable pump arm that is used to produce a transient response in the target sample and a probe arm and may be configured to perform static Magneto-Optic Kerr Effect (MOKE) measurements or ellipsometry measurements when the pump arm is not selected, and time resolved (TR) MOKE measurements or ellipsometry measurements when the pump arm is selected. The optical metrology device may be further configured to perform opto-acoustic measurements when the pump arm is selected. A pulse shaper in the pump arm may be used to pulse duration, phase, or both, of the incident pump beam to enable measurement of the dependence of the magnetic dynamics on the pump pulse characteristics. The optical metrology device may be configured to operate at a single selectable wavelength or multiple wavelengths in a continuous or discontinuous spectrum.

The invention discloses a visual tactile sensor based on a magnetic imaging principle. The visual tactile sensor comprises a shell, an image acquisition module, a magnetic pole display film, an elastic body and a magnetic film, the magnetic pole display film, the elastic body and the magnetic thin film are arranged in the shell from top to bottom, and the image acquisition module is located above the magnetic pole display film and used for acquiring an image of the magnetic pole display film; when the sensor is used for pressure sensing, the position with the maximum gray level variation of the magnetic pole display film image is the pressure acting position, and the pressure is equal to the result that the gray level variation of the magnetic pole display film image is divided by the magneto-optical conversion coefficient of the magnetic pole display film and the product thereof. The magnetic induction intensity in the center range of the surface of the magnetic film, the initial distance between the magnetic film and the magnetic pole display film and the equivalent elastic coefficient of the magnetic film and the elastic body are related. The sensor converts a mechanical signal into a magnetic field signal and then converts the magnetic field signal into an optical image, high-sensitivity sensing of tiny pressure is achieved, and meanwhile the sensor has the higher signal-to-noise ratio, stability and anti-interference capacity.

The invention relates to a magnetic field sensor (1) with a microwave source (6) and a sensor board (2), wherein the sensor board (2) comprises a sensor crystal (5) with at least one magneto-optical defect, an excitation light source (3), a detector (7), and at least two permanent magnets (8). The sensor crystal (5) is arranged such that microwave radiation generated by the microwave source (6) can be absorbed by the at least one magneto-optical defect of the sensor crystal (5). The excitation light source (3) is configured to emit an excitation light beam (4) and is designed and arranged such that the excitation light beam (4) emitted by the excitation light source (3) can cause the emission of fluorescence radiation in the at least one magneto-optical defect of the sensor crystal (5). The detector (7) is designed and arranged such that it detects the emitted fluorescence radiation.The at least two permanent magnets (8) are arranged and configured to generate a homogeneous, static magnetic field in the sensor crystal (5).

The invention discloses an optical neural network non-linear activation system, method and device, and relates to the technical field of optical neural networks, because a magneto-optical material is integrated in a phase adjustment waveguide arm of a non-linear activation unit, a controller can adjust the current activation function type and weight of the optical neural network according to the current activation function type and weight of the optical neural network. And controlling a magneto-optical material of the phase adjustment waveguide arm to generate a magneto-optical effect so as to perform phase adjustment on an optical signal transmitted through the phase adjustment waveguide arm, so that the nonlinear activation unit can adapt to the type and weight of a current activation function, and perform corresponding nonlinear calculation on a target input signal to obtain a target input signal. Dynamic switching of various nonlinear activation functions is realized, and the flexibility of the optical neural network is improved.

The invention provides a Faraday sheet performance measurement and polarization imaging system and method, and relates to the technical field of optical testing. The system comprises a light source system, an optical research platform, a polarizer, a first analyzer, a microscopic imaging system and an image acquisition system, the light source system is used for emitting laser; the optical research platform is used for arranging a to-be-measured Faraday sheet and generating a magnetic field; the microscopic imaging system comprises an eyepiece and an objective lens, and the image acquisition system comprises an image acquisition mechanism; in the first propagation direction of the laser, the light source system, the polarizer, the Faraday piece to be measured, the objective lens, the first polarization analyzer, the eyepiece and the image acquisition mechanism are sequentially arranged. According to the Faraday piece performance measurement and polarized light imaging system, the laser polarization state is accurately controlled, the polarization direction change is accurately detected, and the amplification and focusing functions of a microscopic imaging system are combined, so that the accuracy and comprehensiveness of the performance test of the Faraday piece adopting a magneto-optical film are improved, and the test cost is reduced.

The present application relates to a kind of methods and applications of growing bismuth-doped rare-earth iron garnet BRIG crystal by guided mode pulling-top seed crystal method.For solving the problems of large internal stress, many defects, difficult to prepare thick film of single crystal in the current liquid phase epitaxy method of growing BRIG crystal;And the problems of long growth cycle, difficult to obtain seed crystal in top seed crystal method, the present application combines the fast growth of guided mode pulling crystal and the high-quality single crystal growth of top seed crystal method, and invents guided mode pulling-top seed crystal method to realize the fast growth of high-quality BRIG single crystal.First, the large-size doped rare-earth iron garnet crystal with high lattice matching and similar composition is quickly grown by guided mode pulling method, which is cut into centimeter-level seed crystal, and high-quality BRIG bulk single crystal is quickly grown by TSSG method.The crystal grown by this method has the advantages of small internal stress, less cracking, good uniformity, fast crystal growth, etc., and has obvious advantages in high-performance magneto-optical isolator.

A system is disclosed that includes an electrochemical device that generates a magnetic field and a sensing device that includes a magneto-optical medium, an electromagnetic radiation source configured to emit polarized electromagnetic radiation through the magneto-optical medium, and a sensor configured to receive the polarized electromagnetic radiation that has passed through the magneto-optical medium, the sensing device being positioned relative to the electrochemical device such that the magnetic field of the electrochemical device passes through the magneto-optical medium.

The invention discloses an ultrafast terahertz response magnetic field measurement method and system based on a linear magneto-optical conversion material, and the method comprises the steps: preparing a linear magneto-optical conversion heterojunction film which comprises at least one signal generation layer with a linear magneto-optical conversion characteristic and at least one signal emission layer with a strong spin-orbit coupling effect; placing the heterojunction thin film at the position of a magnetic field to be measured, and irradiating the heterojunction thin film by using femtosecond laser pumping pulse so as to enable the heterojunction thin film to radiate a terahertz signal; through the terahertz vector detection and rotation detection system, the positive and negative and the magnitude of terahertz signals radiated by the heterojunction film in three groups of orthogonal directions are detected, and the magnetic field direction and the magnitude of the magnetic field position to be detected are calculated based on the three groups of terahertz signals. The sensor has the advantages of being high in sensitivity, high in response speed, non-contact and the like, can achieve rapid detection of various vector magnetic fields such as stable, periodic modulation and sub-picosecond transient pulse, and has hundred-nanometer-scale spatial resolution capacity.

A diamond magneto-optical sensor includes: a diamond that includes a color center with an electronic spin and is irradiated with excitation light, and an irradiation unit that irradiates the diamond with the excitation light of the color center and electromagnetic waves for magnetic resonance, wherein the irradiation unit receives modulated light having been subjected to amplitude modulation, and a modulation frequency of the modulated light is included in a microwave frequency band.

The invention discloses an early fault monitoring method, device and equipment for a transformer and a storage medium, and the method comprises the steps: arranging magneto-optical measurement sensors at the two ends and the middle part of a winding in an iron core, obtaining the magnetic leakage induction intensity of the sensors and the current of a high-voltage winding, constructing a coefficient analysis model, and calculating the fault of the transformer; and identifying each coefficient of the current coefficient analysis model through a least square parameter algorithm to obtain an identification result, calculating an identification coefficient change rate based on the identification result and a leakage magnetic induction coefficient of the winding in a normal state, and when the transformer is not no-load and the iron core is not magnetized and saturated, if the identification coefficient change rate is greater than a change rate threshold value, determining that the transformer is in a non-load state. And determining that the transformer has turn-to-turn short circuit. It can be seen that the coefficient analytical model reflects the analytical calculation relation between the current and the magnetic flux leakage induction intensity, through the combination of the analytical model and the recursive least square algorithm, signal offset caused by load fluctuation and power grid disturbance is effectively filtered out, and the stability and accuracy of transformer early-stage turn-to-turn short circuit recognition are improved.

Described is a multilayer signal conducting structure comprising: a plurality of layers, wherein the plurality of layers comprises at least two waveguide layers which extend along an extension direction and which serve to couple in an electromagnetic signal, and at least one intermediate layer arranged between the at least two waveguide layers; at least two cover layers, wherein the at least two waveguide layers are arranged partially or completely between the at least two cover layers, wherein the at least one intermediate layer comprises a magneto-optical material, MO, and / or the at least two cover layers comprise a magneto-optical material, MO. Furthermore, a method for operating a multilayer signal conducting structure is described.

The invention discloses a magneto-optical imaging detection method and device for multi-dimensional magnetic field reconstruction, and relates to the technical field of crack measurement. The method comprises the following steps: S1, selecting a to-be-detected magnetisable sample piece and constructing a magneto-optical imaging detection device; s2, performing multi-layer lift-off crack measurement detection by using a testing device; s3, processing the magneto-optical image, reducing a gray distribution error caused by a light source system, and fitting to obtain a leakage magnetic field peak-to-peak value position; and S4, realizing crack size measurement according to the crack magneto-optical image inversion analysis under the fixed step length. The magneto-optical imaging detection device comprises a magneto-optical imaging system, an infinitesimal displacement lift-off platform, excitation equipment and a magnetisable sample piece to be detected. The influence of the lift-off height on the measurement result is reduced through the multi-layer lift-off technology, finer cracks can be measured, the influence of a light source system is reduced, and meanwhile, the influence of the crack size on magnetic field measurement is reduced by adopting an alternating current excitation and time dimension-considered image processing method.

The invention provides a magnetic field sensing system based on polarization interference. A polarizer and an electro-optical modulator modulate an incoherent optical signal into two beams of linearly polarized light with different polarization states; the delay polarization adjustment module performs phase delay processing on the corresponding wavelength linear polarized light and performs polarization adjustment on another wavelength linear polarized light, and then the polarized light is combined by a polarization beam combiner and transmitted to the magneto-optical crystal; under the action of an external magnetic field, the polarization state of the beam-combined light changes when the beam-combined light passes through the magneto-optical crystal; the polarization analyzer guides the combined light with the changed polarization state to the same polarization direction, so that the intensity of the combined light is changed; the photoelectric detector carries out square law detection on the combined light with the changed intensity to obtain six paths of electric signals; the processor generates four polarization interferences based on the six paths of electric signals, two vernier envelopes are obtained, and the size of the external magnetic field is determined according to the frequency width of split valleys appearing in the lower envelope after the two vernier envelopes are superposed. The device is high in sensitivity and adjustable in measurement range and sensitivity.

The invention discloses an application method and system of non-reciprocity polarized light analysis in weak magnetic field measurement, and mainly relates to the technical field of weak magnetic field measurement. Comprising the following steps: establishing a propagation model of an optical path in a magneto-optical medium based on nonreciprocity of a Faraday magnetic rotation effect; based on the Faraday magneto-optical effect, parallel components of the magnetic field are calculated through the rotation angle in the uniform magnetic field; measuring the spatial distribution of the non-uniform magnetic field by adopting an approximation method; analyzing and judging the polarization property of the light path to obtain elliptically polarized light; and calculating the rotation angle in the elliptically polarized light based on the Malus law. The beneficial effects of the invention are that the method achieves the improvement of the measurement precision, has a wider linear interval, and solves the limitation of directivity.

The invention discloses a magnetic detection device and method based on a four-quadrant detector, belongs to the technical field of magnetic detection, and is used for solving the problems that existing magneto-optical Kerr detection equipment cannot simultaneously detect a polar magneto-optical Kerr effect and a longitudinal magneto-optical Kerr effect through a set of optical paths, the same position of a detected object is difficult to align by using two sets of optical paths, and the detection precision is low. And the detection result is influenced. The device comprises a light source, a polarizer, a spectroscope, a lens assembly, an analyzer and a four-quadrant detector. A light beam with a preset width emitted from the light source is irradiated to a measured object through the spectroscope and the lens assembly; the polarizer is arranged in a light path between the light source and the spectroscope; the measured surface of the measured object is positioned on the focal plane of the lens assembly; light reflected by a detected object at least passes through the lens assembly, the spectroscope and the analyzer and then enters the four-quadrant detector.

The invention discloses a magneto-optical imaging system based on a metasurface and a design method thereof, and relates to the technical field of optical imaging. The magneto-optical imaging system based on the metasurface sequentially comprises a collimation laser light source, a to-be-measured object with magnetism, a metasurface device and a receiving device in the light path transmission direction, the to-be-measured object is used for rotating collimation laser emitted by the collimation laser light source in a polarization state, and the receiving device is used for receiving the collimation laser. The metasurface device is used for splitting emergent light in a polarization state according to horizontal polarization and vertical polarization, and the receiving device is used for receiving two beams of light with different intensities. According to the technical scheme, the emergent light in the polarization state is subjected to beam splitting through the metasurface device, the polarization separation angle is increased, the distance between the metasurface device and the receiving device does not need to be increased, and therefore the length of the magneto-optical imaging system is shortened; therefore, the size of the magneto-optical imaging system is reduced.

The invention provides a preparation method and device of Bi2O3-B2O3 inverse magnetic rotation glass, and the preparation method comprises the following steps: (1) placing a glass raw material in a closed heating furnace, introducing ultra-dry oxygen, and simultaneously exhausting outwards to enable the pressure in the furnace body to be P1 which is more than or equal to 1kPa and less than or equal to 5kPa; (2) heating to melt the glass raw material in the furnace body into molten glass, raising the temperature to a clarification temperature, introducing the mixed gas into the molten glass by a bubbling method, simultaneously homogenizing and stirring, and stopping introducing the mixed gas and starting defoaming and stirring when the homogenizing and stirring time reaches t1; wherein the mixed gas comprises ultra-dry oxygen and boron trichloride, the volume ratio of the ultra-dry oxygen to the boron trichloride is k, and k is (1-5): 1; (3) cooling, forming, annealing and pouring; in the step (2) and the step (3), the pressure in the furnace body is kept P1. The Bi2O3-B2O3 diamagnetic optical rotation glass prepared by the method disclosed by the invention is stable in magneto-optical performance and low in hydroxyl absorption coefficient in a middle-infrared band.

The invention discloses a detection auxiliary device of a magneto-optical isolator, and belongs to the technical field of detection auxiliary devices. The device comprises a detection table; the base is fixedly connected to the bottom of the detection table; the auxiliary transmission structure is mounted at the top of the outer surface of the detection table; the adjustable limiting structure is mounted on one side of the auxiliary transmission structure; and the light guide shielding structure is mounted on one side of the detection table. According to the device, under the action of the auxiliary transmission structure, the position of the adjustable limiting structure can be changed, then auxiliary limiting can be carried out on the magneto-optical isolator under the action of the adjustable limiting structure, due to the three clamping grooves in different shapes, the adjustable limiting structure can clamp the magneto-optical isolators in different shapes, and therefore the clamping effect of the magneto-optical isolators is improved. Due to the fact that the three clamping grooves and related structures are arranged in a circumferential mode, the clamping groove actually playing a clamping role is located under the clamping groove, the other two clamping grooves are located above the clamping groove, and the three clamping grooves and the related structures cannot affect each other.

The invention discloses a BNCT target disc temperature detection system and method. The method comprises the steps that a magneto-optical film with the thickness of 20 + / -1 nm grows on the back surface of a rotating lithium target through magnetron sputtering; a dual-wavelength laser interference light source is introduced into a vacuum target chamber through a coaxial optical fiber probe to form a dual-cavity interference link; the magneto-optical film generates nanoscale displacement by using centrifugal force generated when the rotary lithium target rotates, so that the instantaneous temperature rise of the rotary lithium target is amplified into a phase polarization composite signal capable of being optically detected; the integrated micro slip ring coupling optical path is used for coupling the phase polarization composite signal to a static end photoelectric detector; a phase polarization composite signal output by the photoelectric detector is input into the field programmable gate array, and the transient micro-area temperature field of the rotating lithium target is solved in real time; and the generated transient micro-area temperature field is used as a boundary condition for driving, so that closed-loop verification and temperature control protection of the rotating lithium target are realized. According to the invention, millisecond-level temperature control protection of the ultrathin rotary lithium target can be realized.

The invention relates to a compact optical fiber coupling system and a design method thereof, and belongs to the technical field of beam shaping, the compact optical fiber coupling system comprises a broadband light source, a first metasurface device, a magneto-optical material, a second metasurface device and an optical fiber, the magneto-optical material is used for rotating a light beam passing through the first metasurface device in a polarization state, the second metasurface device is located at the downstream of the magneto-optical material, the second metasurface device is used for shaping emergent light in a specific polarization state, and the optical fiber is located at the downstream of the second metasurface device. The invention has the advantages of miniaturization, high efficiency and high isolation.

The invention discloses a terahertz Airy beam generation method based on an electric control liquid crystal cubic phase plate, and belongs to the technical field of terahertz signal modulation, and the method comprises the following steps: S1, calculating a structural electrode pattern required for manufacturing the cubic phase plate; s2, carrying out photoetching on the DMSO doped PEDOT: PSS organic thin film by using a stripping process, and manufacturing a structural electrode with a cubic phase pattern; s3, manufacturing a liquid crystal cubic phase plate required for generating Airy beams by using a method of loading a vertical electric field to drive liquid crystal through a structural electrode; and S4, generating Airy beams by using the terahertz liquid crystal cubic phase plate. According to the terahertz Airy beam generation method based on the electrically-controlled liquid crystal cubic phase plate, a manufactured terahertz Airy beam generation device is short in finished product period and low in cost, has good broadband optical anisotropy and electro-optical and magneto-optical modulation characteristics, can meet the requirements for large working bandwidth and tunable performance, and has wide application prospects. And the practical application process of the terahertz imaging technology can be accelerated.

According to the refrigerating system of the magneto-optical measuring device and the control method of the refrigerating system, a GM refrigerating machine is externally arranged, a helium circulation throttling expansion structure is utilized, and ultralow-temperature liquid helium at the temperature of 2K or below is obtained through the GM refrigerating machine under the condition that a large amount of liquid helium is not consumed; the GM refrigerating machine and the optical strong magnetic thermostat are connected through the low-loss infusion tube, and the low-loss infusion tube is fixed through the fixing frame, so that vibration transmitted by the GM refrigerating machine part is filtered out, and the experiment conditions of ultralow temperature, strong magnetic field and ultralow vibration are achieved; meanwhile, after entering the optical strong magnetic thermostat, the cooled liquid helium is divided into two parts which do not influence each other and is respectively used for cooling the sample area and the magnet cold shield, so that the cooling efficiency is improved, and the consumption of the liquid helium is reduced.