292 results about "Magneto optical" patented technology

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 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 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 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.

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.

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 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.

A system and method for determining and modifying the electromagnetic activity of a patient's heart includes a sensor array, a controller, software, and a stimulator array. The sensor array includes one or more sensors, such as an ECG electrode, that detect the electromagnetic activity of a patient's heart. The sensor array is in data communication with the controller. The controller runs software that outputs in human-format sensor data provided by the sensor array. The software receives data from the controller, analyzes the data, presents the data to the user, and sends the data to the stimulator array via a data communication link. The stimulator array includes one or more electromagnets and at least one or more light-emitting diodes. The stimulator array emits an electromagnetic (and / or light) field to modify the electromagnetic activity of a patient's heart based on the data it receives from the controller. The system can be portable.

The application discloses an optical neural network nonlinear activation system, method and device, relates to the technical field of optical neural networks, and because a magneto-optical material is integrated in a phase adjustment waveguide arm of a nonlinear activation unit, a controller can control the magneto-optical material of the phase adjustment waveguide arm to generate a magneto-optical effect according to a current activation function type and weights of the optical neural network, so as to perform phase adjustment on an optical signal transmitted through the phase adjustment waveguide arm, and make the nonlinear activation unit adapt to the current activation function type and the weights, perform corresponding nonlinear calculation on a target input signal, and realize dynamic switching of multiple nonlinear activation functions, thereby improving the flexibility of the optical neural network.

The invention belongs to the technical field of quantum optics, and discloses a double-pointer weak measurement-based complex magneto-optical Kerr angle measurement method, which comprises the following steps of: placing a sample to be measured between a weak coupling unit and a system front selection state unit or between the weak coupling unit and a system rear selection state unit, and reflecting an incident light beam from the surface of the sample; the system front selection state unit is adjusted, so that the light intensity signal acquired by the light signal acquisition unit is minimum; adjusting the pre-system selection state unit to enable the polarization state of the outgoing beam to be horizontal or vertical polarization, and adjusting the post-system selection state unit to enable the polarization state of the outgoing beam to be vertical or horizontal polarization; the external magnetic field intensity is adjusted, and meanwhile, the light spot mass center offset and the light intensity are received through the light information acquisition unit; and calculating a magneto-optical Kerr rotation angle and an ellipsometry rate. The method can be used for synchronously measuring the magneto-optical Kerr angle and the ellipsometry in one instrument state, and has extremely high sensitivity.

This invention belongs to the field of electromagnetic field measurement technology for transformers, and proposes a multi-parameter measurement system and calibration device for the electromagnetic field of converter transformers. In the measurement system, a laser is connected to one end of an electro-optic sensing probe, and the other end of the probe is connected to the electromagnetic field measurement host. The laser is also connected to one end of a magneto-optic sensing probe, which in turn is connected to the host. Both probes are bonded to designated points inside the converter transformer's oil tank. The calibration device, used for numerical calibration of the electro-optic and magneto-optic sensing probes, includes an electric field testing platform and a magnetic field testing platform. This invention enables real-time online non-contact electromagnetic field measurement inside converter transformers, which require high insulation, have a compact space, and a sealed structure. It features high sensitivity and a wide measurement range, meeting the measurement needs of complex electric fields in converter transformer equipment under actual operating conditions.

The invention provides a multi-longitudinal-mode fiber laser weak current detection method based on a magnetic rotation sensitive material, and the method comprises the following steps: building a multi-longitudinal-mode fiber laser weak current detection system; a relationship between the magnetic field intensity and the current in the DC coil; determining the relationship between the intra-cavity loss and the Faraday rotation angle of the multi-longitudinal-mode fiber laser resonant cavity within the magnetic field range which does not reach the magnetic saturation intensity of the magneto-optical material; calculating a current value when the magnetic field reaches the magnetic saturation intensity value of the magneto-optical material; when the to-be-measured current value on the coil is between 0 and the critical current, calculating the to-be-measured current value; the magneto-optical sensor is arranged in the multi-longitudinal-mode fiber laser resonant cavity, and the corresponding relation between light intensity change and weak current is constructed through the matching relation between the magneto-optical sensor and the multi-longitudinal-mode fiber laser resonant cavity, so that small current change which is difficult to measure by a traditional sensor can be detected, and high-sensitivity measurement is realized.

The invention relates to the technical field of optics, and discloses a displacement adjusting method of a magneto-optical crystal, so as to meet the requirement that a user can conveniently, reliably, flexibly and manually switch among multiple wavelengths or multiple optical rotation angles. The method comprises the following steps: determining the magnetic flux density distribution of the magneto-optical crystal along the optical axis displacement in a target equipment magnetic cylinder to which the magneto-optical crystal belongs; determining the transmission relation of the adjusting ring of the target equipment in the process of circumferentially rotating around the optical axis to drive the magneto-optical crystal to move along the optical axis; calculating Vierdean constants respectively corresponding to the series of target wavelengths at the expected working temperature of the target equipment; according to the magnetic flux density distribution, the Viert constant and the length of the magneto-optical crystal, a series of positions where the magneto-optical crystal generates the same target optical rotation angle for polarized beams corresponding to different target wavelengths in the displacement process of the target magnetic cylinder are calibrated; and in the assembling process, the reference position is determined firstly, and then the corresponding scribed line on the adjusting ring is aligned with the reference line on the shell.

The application discloses a multi-directional excitation magneto-optical image registration method under hybrid driving, and the method comprises the following steps: collecting the defect magnetic field distribution information of the surface of a ferromagnetic material under multi-directional excitation through a magneto-optical imaging device to obtain a reference image and a floating image; extracting the defect contour of the two images according to a gradient operator; performing spatial transformation on the defect contour of the floating image, and then performing or operation and morphological closing operation on the defect contour of the floating image and the defect contour of the reference image to obtain a defect contour map with closed shape; obtaining the magnetic leakage field distribution map of the defect contour map through defect magnetic leakage field model forward modeling; calculating the similarity measure of the reference image and the magnetic leakage field distribution map generated by the model; and finally continuously updating the spatial transformation parameters through an optimization search algorithm, and the registration is successful when the similarity measure reaches the maximum.

The invention belongs to the technical field of magneto-optical Kerr microscopic imaging, and discloses a magneto-optical Kerr instrument sample correction device and a correction method thereof.The magneto-optical Kerr instrument sample correction device comprises a machine body, imaging equipment is installed in the machine body, a sample table is arranged below the imaging equipment, a protection assembly is installed in the machine body, and the protection assembly comprises a shading plate installed in the machine body; the shading plate is slidably connected with the machine body through a moving assembly, and shading curtains are installed on the two sides of the bottom of the shading plate and slidably connected with the shading plate through opening and closing assemblies. In the working process, a closed correction environment is formed through the shading plate and the two shading curtains, the problem that the measurement precision is reduced due to the fact that ambient light can be directly overlapped in the total light intensity received by the detector and the accuracy rate of sample correction is affected is solved, the accuracy rate of sample correction is improved, and compared with a traditional totally-closed camera obscura correction device, the measurement precision is improved. Cost of shading by adopting the shading curtain is greatly reduced, personnel can enter in real time, and the method is suitable for scenes needing frequent correction.

The present invention discloses a magnetic induction intensity detection device based on laser self-mixing interference. The laser light emitted by the laser is split by a spectrometer and then divided into two optical paths. A polarizer, a magneto-optical crystal, and a transducer are sequentially arranged on one optical path. The transducer is electrically connected to a control module, which generates a continuous sinusoidal wave signal to continuously control the transducer. A detector is arranged on the other optical path. The detector is electrically connected to a Fourier transform module, which analyzes the laser self-mixing interference signal obtained by the detector. The magneto-optical crystal is located inside a magnetic field. The laser light emitted by the laser is reflected multiple times between the laser and the transducer, and under the action of the polarizer, laser self-mixing interference is formed. In the present invention, the laser light is reflected multiple times between the laser and the transducer, which can enhance the Faraday rotation effect. In addition, the polarizer is used as a polarizer and an analyzer, which has the advantages of not requiring an external analyzer, reducing measurement costs, and improving sensitivity.

The application belongs to the technical field of magneto-optical glass materials, and particularly relates to high-refraction high-rare-earth-doped magneto-optical glass as well as a preparation method and application thereof. The composition of the high-refraction high-rare-earth-doped magneto-optical glass comprises: 30-62mol% of Tb2O3, 0-45mol% of B2O3, 0-30mol% of Al2O3, 0-25mol% of SiO2, 0-40mol% of Ga2O3, 0-5mol% of Ce2O3 (not 0), 0-5mol% of Sb2O3, and the sum of the mole percentages of the components is 100mol%.

The invention provides a non-reciprocal terahertz device. The non-reciprocal terahertz device comprises a first waveguide; the second waveguide is suitable for outputting the terahertz wave from the first waveguide; the at least three third waveguides are used for coupling the terahertz waves from the first waveguides to the second waveguides; the composite structure is positioned in each third waveguide and comprises a substrate; the first grating is suitable for converting the terahertz wave from the first waveguide from a linear polarization state to a circular polarization state rotating along a first direction; the magneto-optical material layer allows the circular polarization state terahertz waves rotating in the first direction to pass through under the action of an external magnetic field and blocks the circular polarization state terahertz waves rotating in the second direction to pass through; and the second grating is suitable for converting the terahertz wave passing through the magneto-optical material layer from a circular polarization state rotating along the first direction to a linear polarization state, transmitting the terahertz wave in the linear polarization state to the second waveguide, and converting the reflected terahertz wave from the linear polarization state to a circular polarization state rotating along the second direction.

The utility model relates to a magneto-optical isolator and laser equipment. The magneto-optical isolator comprises a polarization light splitting element which can penetrate through first polarization light and block second polarization light, and the polarization light splitting element is provided with a first area and a second area; the optical rotation device is opposite to the first area; the magnetic optical rotation element is arranged on one side, opposite to the polarization light splitting element, of the optical rotation device and is provided with a third area and a fourth area; the conduction assembly enables light rays entering the magnetic rotation element from one of the third area and the fourth area to go back and forth in the magnetic rotation element and then to be emitted out from the other one of the third area and the fourth area; light emitted from the first area is converted into one of first polarization state light and second polarization state light after passing through the optical rotation device and the magnetic optical rotation element, and light emitted from the second area is converted into the other one of the first polarization state light and the second polarization state light after passing through the magnetic optical rotation element and the optical rotation device. According to the magneto-optical isolator, the miniaturization design can be realized.

The utility model is suitable for the technical field of optical equipment, and provides a Faraday rotator, an optical isolator and an optical circulator. The Faraday rotator comprises a magneto-optical component and a magnetic field applying piece, and the magnetic field applying piece can apply an external magnetic field to the magneto-optical component; the magneto-optical component can enable the polarization state of the polarized light to rotate by a preset angle along a first turning direction in an external magnetic field, and the preset angle forms an optical rotation angle; the magneto-optical component is provided with a light incident surface and a reflecting surface which are oppositely arranged, a first light-transmitting film and a second light-transmitting film are sequentially arranged on the light incident surface, and a first reflecting film is arranged on the reflecting surface; when one of the first light-transmitting film and the second light-transmitting film passes through the polarized light propagating toward the first reflective film, the other passes through the polarized light and emits the polarized light to the outside of the magneto-optical member. By means of the design, the Faraday rotator can still achieve the original effect on the premise that the size of the magnetic field generating piece is reduced, and reduction of the overall size of the Faraday rotator is facilitated.

The present invention provides a refrigeration system for a magneto-optical measurement device and its control method. The GM refrigerator is externally placed and a helium gas circulation throttling expansion structure is adopted to obtain ultra-low temperature liquid helium at 2K and below using the GM refrigerator without consuming a large amount of liquid helium. Moreover, a low-loss liquid delivery pipe is used to connect the GM refrigerator and the optical high magnetic field thermostat, and a fixing bracket is used to fix the low-loss liquid delivery pipe, thereby filtering out the vibration transmitted from the GM refrigerator part, achieving experimental conditions of ultra-low temperature, high magnetic field, and ultra-low vibration. At the same time, after the cooled liquid helium enters the optical high magnetic field thermostat, it is divided into two parts without mutual influence and is respectively used to cool the sample area and the magnet cold shield, thereby improving the cooling efficiency and reducing the consumption of liquid helium.

The invention discloses a magneto-optical effect-based dynamic zooming method and an optical system, and the method comprises the steps: arranging at least one magneto-optical crystal between a pre-amplifier and a main amplifier, so as to achieve the dynamic zooming through the magneto-optical effect; wherein the magneto-optical crystal is obtained by combining anisotropic materials with matched refractive indexes, and the anisotropic materials are processed into complementary parabola shapes. According to the invention, the magneto-optic effect is utilized to realize dynamic zooming, and the mode of complementary combination of the crystals with matched refractive indexes is utilized to solve the problem that the additional wavefront shape does not conform to the demand. Compared with an electro-optical effect scheme, an applied magnetic field is a uniform magnetic field along a transmission direction, so that a depolarization problem caused by a transverse component is avoided; compared with the scheme of aperture division, grating division and the like, the dynamic zooming can be realized on the premise of not influencing the output capability of the laser.