46 results about "Optical coefficient" patented technology

The invention relates to the technical field of damage detection, and discloses a screen protection film damage detection method and system, and the method comprises the steps: carrying out the laser interference thickness scanning of a screen protection film, and obtaining three-dimensional thickness distribution data and thickness gradient vector field data; performing multi-layer polarization interference detection on the circularly polarized light beam based on the three-dimensional thickness distribution data to obtain polarization phase difference distribution data; according to the thickness gradient vector field data, non-periodic phase unenveloping processing is carried out on the polarization phase difference distribution data to obtain continuous polarization phase distribution data; performing stress optical coefficient tensor calculation and dynamic elliptical polarization modulation based on the continuous polarization phase distribution data to obtain stress damage space positioning data; the edge cutting area and the center bending area of the screen protection film are subjected to damage imaging reconstruction, a three-dimensional stress damage imaging result is obtained, and full-chain detection from geometric thickness change to stress distribution and then to damage positioning is achieved.

The invention discloses acousto-optic chalcogenide glass with a high laser damage threshold, the chemical composition formula of the acousto-optic chalcogenide glass is GexSySez, x, y and z respectively represent the mole fractions of Ge, S and Se, x = 10-30, y = 5-40, z = 40-70, x + y + z = 100, and the microscopic network structure of the acousto-optic chalcogenide glass contains a [GeSe4] tetrahedron, a [GeSSe3] tetrahedron, a [GeS2Se2] tetrahedron, a [GeS3Se] tetrahedron, a [GeS4] tetrahedron and a Se ring. The acousto-optic chalcogenide glass provided by the invention has a relatively high laser damage threshold Fth (9.72-15.58 J / cm < 2 > at1550 / 20ns / 5kHz), a relatively low thermo-optic coefficient dn / dT and good acousto-optic characteristics and mechanical properties, is high in near-infrared band transmittance, and has a relatively high laser damage threshold while ensuring a high acousto-optic quality factor. The material can be used as a material basis for developing high-performance and high-stability infrared acousto-optic modulation devices.

The invention discloses a thin-film barium titanate electro-optical switch unit based on a composite electrode and an array thereof. The optical switch unit comprises a first waveguide optical fiber coupling module, a second waveguide optical fiber coupling module, an optical beam splitting module, an electro-optical phase shift region, an optical beam combining module, a third waveguide optical fiber coupling module and a fourth waveguide optical fiber coupling module. Wherein the composite electrode of the electro-optic phase shift region is composed of a metal electrode and a transparent conductive layer, the electrode is closer to the waveguide by utilizing the transparent characteristic of a transparent conductive material, the coupling of a light field and an electric field is effectively enhanced, and the extinction ratio is improved. Meanwhile, a barium titanate film with a high electro-optical coefficient is adopted as a waveguide material, and the performance is further optimized, so that the electro-optical switch unit has the excellent characteristics of low-voltage driving, high extinction ratio, low insertion loss and small size.

A temperature measurement device (1) comprises: a light emission unit (10) that generates coherent, continuous measurement-light; a light detection unit (30) that detects reflected light or transmitted light of the continuous measurement-light which is projected onto a sample (50) to be measured; and an analysis unit (42) that calculates a temperature distribution of the sample (50) to be measured on the basis of the intensity of the reflected light or the transmitted light detected by the light detection unit (30). The analysis unit (42) calculates the optical thickness of the sample (50) to be measured from a temporal change in the intensity of the reflected light or the transmitted light and, by using a refractive index distribution model representing the relationship between the optical thickness and a refractive index distribution in the thickness direction of the sample (50) to be measured at the time of a temperature change, calculates the refractive index distribution from the optical thickness, and calculates the temperature distribution of the sample (50) to be measured by converting the refractive index distribution into the temperature distribution on the basis of the thermo-optical coefficient of the sample (50) to be measured.

The application discloses a modulation-insensitive dual-mode waveguide optical switch and a preparation method thereof, and belongs to the technical field of planar optical waveguide devices. The switch is composed of a silicon wafer substrate, a polymer lower cladding layer, a polymer optical waveguide core layer and a polymer upper cladding layer from bottom to top, the polymer optical waveguide core layer is covered in the polymer upper cladding layer, and the refractive index of the polymer optical waveguide core layer is higher than that of the polymer upper cladding layer and the polymer lower cladding layer. The application utilizes the advantages of simple asymmetric directional coupling structure and asymmetric Y branch structure and the large thermal-optical coefficient of organic polymer materials, and realizes the modulation-insensitive switch of two signal optical modes through mode conversion by using the asymmetric Y branch when the heating electrode is modulated. The preparation process of the application is simple, only needs spin coating, photoetching and wet etching, effectively reduces the production cost, improves the production efficiency of the device, is favorable for large-scale batch production, and enables the mode signal optical switch to be applied to actual use.

The invention discloses a nano-bubble optical coefficient measurement method based on a multilayer spherical shell Mie theory, relates to the technical field of nano-bubble and nano-particle optical property measurement, and aims to solve the problem that an existing method cannot measure the optical property of a nano-bubble, the energy of laser absorbed by nano-particles is obtained according to the change of the transmission light intensity of the nano-particles, and the optical coefficient of the nano-bubble is measured according to the change of the transmission light intensity of the nano-particles. And substituting the refractive index field into an energy equation, obtaining the temperature and density in the nano-bubble forming process through a lattice Boltzmann method, and further obtaining the optical coefficient of the nano-particles wrapped by the nano-bubbles based on the multilayer spherical shell Mie theory according to the change condition of the refractive index field along with the degree.

The invention relates to chalcogenide glass with a low thermo-optical coefficient as well as a preparation method and application of the chalcogenide glass. The chalcogenide glass with the low thermo-optical coefficient is prepared from the following components in percentage by weight: 78 to 84 percent of Se; 12%-20% of Ge; and 4%-8% of As. Through specific component design, the thermo-optical coefficient is reduced, and the influence of temperature on the optical system is reduced, so that the wavefront distortion control precision of the optical system in an extreme temperature environment is ensured.

The present invention relates to the field of optical waveguide manufacturing technology, specifically disclosing an optical waveguide, a manufacturing method thereof, and an optical waveguide spot adapter. The optical waveguide is manufactured using silicon oxycarbide with a refractive index ranging from 1.457 to 2.7 (inclusive), exhibiting low transmission loss and a good thermo-optical coefficient. The optical waveguide is suitable for optical waveguide devices of various sizes and can be used for optoelectronic monolithic and hybrid integration. Furthermore, the optical waveguide can achieve single-mode transmission even with a large refractive index difference between the core and cladding, resulting in lower loss compared to standard single-mode fiber coupling. Furthermore, the provided optical waveguide manufacturing method utilizes a low process temperature during the manufacturing process, eliminating the need for high-temperature annealing and being compatible with IC manufacturing processes.

This invention discloses an ultra-low residual amplitude modulation waveguide-optical phase modulator, comprising a first electrode layer and a second electrode layer parallel to each other. An α-phase waveguide channel and a substrate layer are disposed between the first and second electrode layers. The optical axes of the α-phase waveguide channel and the substrate layer are both perpendicular to the plane of the first electrode layer. The difference between the thermo-optical coefficient of the α-phase waveguide channel and the thermo-optical coefficient of the substrate layer is less than a preset thermo-optical coefficient difference threshold. Part of the side of the α-phase waveguide channel is covered by the substrate layer. The electric field between the first and second electrode layers uniformly covers the entire α-phase waveguide channel and the substrate layer. The two ends of the α-phase waveguide channel serve as the input and output ends of the light beam, respectively. This invention, by changing the electric field application method and thermo-optical coefficient matching, fundamentally maintains the consistency of the interference phase, thereby significantly reducing the sensitivity of RAM signals to voltage and ambient temperature fluctuations.

The embodiment of the invention provides a chromophore compound, a preparation method of the chromophore compound, an organic electro-optical material and application of the organic electro-optical material, and relates to the technical field of materials. The chromophore compound comprises a conjugate bridge, and a receptor and a donor which are respectively connected to two ends of the conjugate bridge through chemical bonds, the donor comprises aniline and a derivative structure thereof, and the aniline and the derivative structure thereof comprise silyl ether groups. By introducing the silyl ether group into the donor, the chemical stability and thermal stability of the chromophore compound can be improved. Meanwhile, when the chromophore compound is applied to the organic electro-optical material, the organic electro-optical material can have low dipole moment, and the nonlinear optical performance of the organic electro-optical material is improved. Furthermore, the donor in the chromophore compound has strong electron donating ability and can be cooperated with the receptor, and the beta value of the chromophore compound can be effectively improved, so that the organic electro-optical material can generate a larger electro-optical coefficient subsequently.

The present invention relates to the field of damage detection technology, and discloses a damage detection method and system for a screen protective film. The method comprises: performing laser interference thickness scanning on the screen protective film to obtain three-dimensional thickness distribution data and thickness gradient vector field data; performing multi-layer polarization interference detection on a circularly polarized light beam based on the three-dimensional thickness distribution data to obtain polarization phase difference distribution data; performing non-periodic phase de-envelopment processing on the polarization phase difference distribution data according to the thickness gradient vector field data to obtain continuous polarization phase distribution data; performing stress optical coefficient tensor calculation and dynamic elliptical polarization modulation based on the continuous polarization phase distribution data to obtain stress damage spatial positioning data; and performing damage imaging reconstruction on the edge cutting area and the central bending area of ​​the screen protective film to obtain three-dimensional stress damage imaging results. The present invention realizes full-chain detection from geometric thickness change to stress distribution to damage positioning.

The invention provides a gradient doped ferroelectric film device and a preparation method thereof, and relates to the technical field of optoelectronic devices. The gradient doped ferroelectric thin film device comprises a substrate, a buried oxide layer, a buffer layer and a ferroelectric thin film material layer which are sequentially stacked from bottom to top, impurity ions are doped in the ferroelectric film material layer, and the doping concentration of the impurity ions is sequentially increased from bottom to top. By adopting the gradient doping design increasing from bottom to top, the interface defect and the internal stress of the ferroelectric film are optimized, the problem of lattice mismatch between a common ferroelectric film and the substrate layer is solved, the crystal quality is improved, the electro-optical coefficient is enhanced, and the electro-optical effect is effectively improved.

The invention provides a chiral coupling ytterbium-doped optical fiber and a high-power optical fiber laser, and relates to the technical field of optical fibers. The ytterbium-doped optical fiber sequentially comprises a central fiber core, a plurality of spiral side cores, an inner cladding and an outer cladding from inside to outside, wherein the spiral side cores are spirally wound on the central fiber core along the axial direction of the central fiber core; wherein the basic mode refractive index of at least one spiral side core in the multiple spiral side cores is different from the refractive index of the central fiber core in a preset high-order mode, and the thermo-optical coefficient of the spiral side core with the refractive index different from the refractive index of the central fiber core in the preset high-order mode is larger than that of the central fiber core. The chiral coupling ytterbium-doped optical fiber provided by the invention can effectively remove a high-order mode in the central fiber core.

The invention provides a superlattice electro-optical thin film material and a composite film layer and an electro-optical component comprising the same. The superlattice electro-optical thin film material is composed of dielectric material layers and barium titanate layers which grow periodically and alternately, in each period, each barium titanate layer is provided with m unit cell layers, each dielectric material layer is provided with n unit cell layers, m is in the range of 5-50, and n is in the range of 1-20; wherein the material for the dielectric material layer is selected from scandate or strontium tantalum lanthanum aluminate. The electro-optical composite film layer based on the barium titanate superlattice structure solves the problem that the electro-optical performance of traditional barium titanate is degraded, and the electro-optical coefficient of the barium titanate film approaches or even exceeds the level of block barium titanate.

The present application relates to a kind of unidirectional glass fiber reinforced polymer stress optical coefficient detection methods based on terahertz time-domain spectroscopy, comprising: S1, preparation of unidirectional glass fiber reinforced polymer under different curing temperature, in preparation process, respectively along fiber direction and perpendicular fiber direction embedding fiber Bragg grating;Obtain the residual strain of unidirectional glass fiber reinforced polymer along fiber direction and perpendicular fiber direction e x 、 e y , and then calculate the residual stress of along fiber direction and perpendicular fiber direction s x 、 s y ;S2, based on transmission terahertz time-domain spectroscopy system, obtain the refractive index of unidirectional glass fiber reinforced polymer along fiber direction and perpendicular fiber direction n x 、 n y ;S3, establish the propagation model of terahertz wave in different stress state of unidirectional glass fiber reinforced polymer;Combined s x 、 s s y 、 n x 、 n y , calculate the stress optical coefficient of unidirectional glass fiber reinforced polymer.This method is conducive to accurately detecting the stress optical coefficient of unidirectional glass fiber reinforced polymer.

The invention discloses CsSnCl3 nanocrystal doped chalcogenide glass and acousto-optic application of the CsSnCl3 nanocrystal doped chalcogenide glass, the molar composition formula of the chalcogenide glass is 97 (0.8 GeS2-0.2 Sb2S3)-3 CsSnCl3, and CsSnCl3 nanocrystals separated out in situ through heat treatment are dispersed in the chalcogenide glass. The chalcogenide glass has the advantages as follows: the chalcogenide glass has excellent thermal mechanical properties and high robustness, the comprehensive characteristics are outstanding, the Vickers hardness, the elastic modulus, the thermo-optical coefficient, the laser damage threshold and other parameters of the chalcogenide glass are remarkably improved compared with those of current mainstream acousto-optic chalcogenide glass, and a guarantee is provided for stable operation of a device in a high-temperature and high-power environment; the CsSnCl3 nanocrystals are packaged by using the stable glass matrix, so that the problems that the Sn-based perovskite material is easy to oxidize in the environment and poor in stability are fundamentally solved; the material has good infrared acousto-optic comprehensive characteristics and an ultra-wide infrared transmission range, can be used as an acousto-optic medium to be applied to acousto-optic devices, and has a wide application prospect in the acousto-optic field.

The invention discloses a quantum dot-plasmon strong coupling device capable of electro-optical modulation and a preparation method thereof. The quantum dot-plasmon strong coupling device comprises a bottom silicon substrate, a silicon dioxide oxide layer, a lead zirconate titanate thin film, a metal interdigital electrode and a quantum dot light-emitting layer, and the bottom silicon substrate, the silicon dioxide oxide layer and the lead zirconate titanate thin film are sequentially arranged from bottom to top. The metal interdigital electrode is arranged in an interdigital grating array groove structure of the lead zirconate titanate film, and the quantum dot light-emitting layer is arranged in an area above a first groove and a second groove of the interdigital grating array groove structure. According to the quantum dot-plasmon strong coupling device, in the modulation performance, lead zirconate titanate serves as a relaxation ferroelectric material, the electro-optical coefficient of the relaxation ferroelectric material is far higher than that of a lithium niobate material, nanosecond-level ultra-high-speed response can be achieved, and the refractive index of the material can be adjusted in real time so as to be matched with the quantum dot energy level.

The present disclosure relates to an intraoral scanning system configured to determine a 3D graphical representation of a dental object. The system may include a handheld intraoral scanner configured to provide an invisible 2D image and a visible sub-scan of a dental subject; and one or more processors configured to determine a point cloud of the invisible 2D image and the visible sub-scans, determine a 3D finite element mesh, and align the point cloud with the 3D finite element mesh, where the 3D finite element mesh includes a plurality of finite elements, and where each finite element of the plurality of finite elements includes a plurality of vertices, determining one or more optical coefficients for each vertex of the plurality of vertices, and wherein the one or more optical coefficients correspond to a dental feature represented by the aligned point clouds; determining a triangular mesh representation of the aligned point clouds corresponding to the visible sub-scans, and wherein the triangular mesh representation comprises triangularly arranged vertices of the plurality of vertices; determining a tetrahedral mesh representation of the aligned point clouds corresponding to the invisible 2D image, and wherein the tetrahedral mesh representation comprises tetrahedral arranged vertices of the plurality of vertices; and wherein the 3D graphical representation is determined based on the triangular mesh representation and the tetrahedral mesh representation.

This invention provides a method based on MXene Ti 3 C 2 T x All-optical phase modulation device and modulation method for PDMS. This all-optical phase modulation device consists of a fiber interferometer and MXene Ti... 3 C 2 T x Two-dimensional materials, PDMS material composition, MXene Ti 3 C 2 T x Two-dimensional material was deposited onto the surface of coreless fiber II of the fiber interferometer. The surfaces of coreless fibers I and II of the fiber interferometer were also coated with PDMS material to complete the fabrication of an all-optical phase modulator. Based on MXene Ti... 3 C 2 T x The high photothermal conversion efficiency of two-dimensional materials and the high thermo-optical coefficient of PDMS material convert changes in excitation light into changes in the refractive index of PDMS material. The fiber optic interferometer senses the refractive index change of PDMS material, causing wavelength shift and phase change in the output interference spectrum. This invention optimizes the sensitivity of phase modulation, reduces device size, and enhances device reliability and practicality.

The invention discloses a Na5Tb9F32 magneto-optical crystal and a preparation method and application thereof, the chemical formula of the Na5Tb9F32 magneto-optical crystal is Na5Tb9F32, the crystal is of a cubic structure, the space group structure is Fm-3m, and birefringence does not exist; the order of magnitude of the thermo-optical coefficient of the material reaches 10 <-6 > K <-1 >, and the Vierdet constant is 33-34 Rad.m <-1 >. T <-1 > at 1064nm; the uniform melt crystallization characteristic is realized. The Na5Tb9F32 magneto-optical crystal is of a cubic structure, and birefringence does not exist; the thermo-optical coefficient is small, and the system is suitable for a high-power and high-stability optical system; the crystals have consistent melt crystallization characteristics, and large-size crystals are easy to grow. The Na5Tb9F32 magneto-optical crystal can be prepared by adopting a well-known crystal growth method, is a novel magneto-optical material with great potential, and is very suitable for being used as a crystal element of a high-power and high-stability magneto-optical device.

The invention provides an optical switch and a silicon optical chip, the optical switch comprises a first waveguide and a second waveguide, and the first waveguide and the second waveguide are arranged in parallel; the second waveguide comprises a main body and a first slot arranged in the main body; the first waveguide is made of a first material, the main body is made of the first material, and the first gap is filled with a second material; the thermo-optical coefficient of the first material is greater than that of the second material; the optical switch is sequentially provided with an input port area, an input coupling area, a non-coupling phase modulation area, an output coupling area and an output port area in the light propagation direction, and the input port area, the input coupling area, the non-coupling phase modulation area, the output coupling area and the output port area are all arranged on the first waveguide and the second waveguide. The width of the first waveguide in the uncoupled phase modulation area is 450 nanometers, and the width of the second waveguide in the uncoupled phase modulation area is 600 nanometers. The cost is reduced while the optical switch is realized.

Fatigue-resistant photoelastic soft materials are provided for soft robots and other sensing applications. The fatigue-resistant photoelastic soft materials include hydroscopic salt that allow the stress-optical coefficient of the fatigue-resistant photoelastic soft material to be tuned. The fatigue-resistant photoelastic soft materials include molecular entanglements that help to tune mechanical properties of the fatigue-resistant photoelastic soft materials.

A thermo-optic coefficient measurement system can include a housing structure (101) configured to retain at least a first plate sample (103a), a second plate sample (103b), and a third plate sample (103c) in a stacked, alternating stagger arrangement such that a gap (105) exists between the first plate sample (103a) and the third plate sample (103c) that is the thickness of the second plate sample (103b). The system also includes a first optical device (107) connected to the housing (102) to output a first laser (107a) configured to be transmitted through the first plate sample (103a) and the third plate sample (103c) without the second plate (103b) in between. The first optical device (107) is configured to receive a first return signal. The system also includes a second optical device (109) connected to the housing (101) to output a second laser (109a) configured to be transmitted through the second plate sample (103b) only, the second optical device (109) is configured to receive a second return signal. The system includes an optical interrogator module (111) configured to be connected to the first optical device (107) to output the first laser (107a) thereto and to receive the first return signal therefrom. The optical interrogator module is configured to be connected to the second optical device (109) to output the second laser (109b) thereto and to receive the second return signal therefrom. The optical interrogator module (111) is configured to determine a thermo-optical coefficient of the second plate sample (103b) as a function of the first return signal and the second return signal at a plurality of temperatures.

The invention belongs to the technical field of crystal materials and optics, and relates to a potassium borate niobate electro-optical crystal and a preparation method and application thereof.The chemical formula of the potassium borate niobate electro-optical crystal is K3Nb3B2O12, the crystal belongs to a trigonal system, the space group is P31m, and the cell parameters are as follows: alpha = beta = 90 degrees, gamma = 120 degrees, Z = 1, Z = 1, Z = 1, Z = 1, and Z = 1. The potassium boron niobate electro-optical crystal has the characteristics of wide transmission range, high transmittance, large electro-optical coefficient and the like, has stable physical and chemical properties and thermal properties, is not easy to deliquesce, has good mechanical properties and is easy to process.

The invention discloses a groove-type micro-ring resonant cavity sensor, and relates to the field of optical waveguide sensors, the sensor comprises a coupling area integrated with an S-shaped bent waveguide and a groove-type micro-ring resonant cavity formed by a groove-type waveguide formed by waveguide ridges, and the groove and the cavity of the groove-type micro-ring resonant cavity are filled with an aqueous solution with a negative thermo-optical coefficient as an upper cladding. According to the invention, the optical coupling efficiency is optimized through the design of the S-shaped bent waveguide, and the energy of an optical field is highly converged in the groove, so that the interaction efficiency of light and a to-be-detected substance is improved, and the sensing sensitivity of the sensor is improved; meanwhile, the negative thermo-optic effect of the aqueous solution is utilized to accurately compensate the positive thermo-optic effect of silicon and silicon dioxide, so that the effect that the change rate of the effective refractive index to the temperature tends to zero is achieved, the sensing sensitivity of the sensor is further improved, and the problem that in a traditional scheme, sensing sensitivity improvement and temperature drift suppression contradict with each other is effectively solved.

The invention relates to the technical field of optical waveguide manufacturing, and particularly discloses an optical waveguide, a manufacturing method thereof and an optical waveguide spot size adapter, for the optical waveguide, silicon oxycarbide with the refractive index range of 1.457-2.7 (including 1.457 and 2.7) is used as a material for manufacturing the optical waveguide, the optical waveguide has the characteristics of low transmission loss and good thermo-optical coefficient, and is suitable for optical waveguide devices with different sizes, and the optical waveguide spot size adapter is suitable for optical waveguide devices with different sizes. The optical waveguide can be used for photoelectric monolithic integration and hybrid integration, meanwhile, the optical waveguide can still achieve single-mode transmission under the condition that the refractive index difference of the core cladding is large, compared with standard single-mode optical fiber coupling, loss is low, and the provided optical waveguide manufacturing method is low in process temperature in the manufacturing process, does not need high-temperature annealing and is compatible with the IC manufacturing process.

The invention relates to the technical field of integrated optoelectronic devices, in particular to a silicon-organic polymer mixed slow light waveguide electro-optical modulator which comprises a silicon input and output waveguide, a grating type slow light silicon waveguide, a multi-mode interference waveguide, an organic electro-optical polymer cladding, a T-shaped metal modulation electrode and a silicon dioxide upper and lower cladding. The optical wave group speed is reduced through the grating type slow optical waveguide design, the photoelectric signal interaction is enhanced, and efficient modulation is achieved by combining the organic polymer with the high electro-optical coefficient. According to the invention, the modulation efficiency and bandwidth can be remarkably improved, the device size and power consumption are reduced, and the scene requirements of high-speed data center interconnection, high-performance calculation and the like are met.

According to the present invention, it is possible to provide a joined body in which a single crystal thin film having a high electro-optical coefficient is provided on a substrate. Furthermore, according to the present invention, it is possible to provide an optical modulator using the joined body and a method for manufacturing the joined body.　This joined body (1) comprises: a substrate (10) including a single crystal of a rock salt-type structure compound, a perovskite-type oxide, or a fluorite-type oxide on one main surface (10a); and a thin film (20) comprising a single crystal of barium titanate having a (100) orientation, the thin film (20) being provided on the main surface (10a) of the substrate (10). A ferroelectric domain (30) in a direction parallel to the main surface (10a) of the substrate (10) is present inside the thin film (20), and misfit dislocations (40) are present at an interface between the thin film (20) and the substrate (10).

The invention discloses a method and a device for calculating an optical coefficient at a VTI medium interface. The method comprises the following steps: acquiring a real number slowness angle and a complex incidence slowness vector at the interface of two viscoelastic VTI mediums; calculating an incident slowness tangential real component and an incident slowness normal component by using the real number slowness angle and the complex number incident slowness vector; and calculating a ray velocity vector and an optical coefficient according to the incident slowness tangential real component and the incident slowness normal component. According to the method, aiming at the condition of incidence greater than a critical angle, the real number slowness direction hypothesis is combined with the real number Snell law, so that the wanted R / T coefficient can be successfully obtained under any condition; the problem that an existing method is not applicable due to the three-fork or sharp-point phenomenon of qP waves and qSV waves in a strong VTI medium and the non-uniform ray speed after the incident critical angle is exceeded is solved.

The invention discloses a Na5Tb9F32 magneto-optical crystal and a preparation method and application thereof, the chemical formula of the Na5Tb9F32 magneto-optical crystal is Na5Tb9F32, the crystal is of a cubic structure, the space group structure is Fm-3m, and birefringence does not exist; the order of magnitude of the thermo-optical coefficient of the material reaches 10 <-6 > K <-1 >, and the Vierdet constant is 33-34 Rad.m <-1 >. T <-1 > at 1064nm; the uniform melt crystallization characteristic is realized. The Na5Tb9F32 magneto-optical crystal is of a cubic structure, and birefringence does not exist; the thermo-optical coefficient is small, and the system is suitable for a high-power and high-stability optical system; the crystals have consistent melt crystallization characteristics, and large-size crystals are easy to grow. The Na5Tb9F32 magneto-optical crystal can be prepared by adopting a well-known crystal growth method, is a novel magneto-optical material with great potential, and is very suitable for being used as a crystal element of a high-power and high-stability magneto-optical device.