50 results about "Nonlinear optical material" patented technology

The invention belongs to the technical field of nonlinear optical crystals, and particularly relates to a zeolite-like structure nitrogen oxide silicate nonlinear optical crystal and a preparation method and application thereof, the chemical general formula of the crystal is Ba3Si3N5OCl, the crystal belongs to a hexagonal system, the cell parameters of the crystal are as follows: a is 9.5147 (6), c is 5.5002 (4), V is 431.22 (6) 3, Z is 2, the space group is P-62c, and the crystal has a non-centrosymmetric structure. The Ba3Si3N5OCl crystal provided by the invention is used as a novel zeolite-like structure nitrogen oxide silicate, successfully integrates nonlinear optical activity and phase matching capability, can generate frequency doubling response which is about 0.2 times of KDP (potassium dihydrogen phosphate) under 1064 nm laser pumping, and can realize phase matching, so that the Ba3Si3N5OCl crystal becomes a nonlinear optical material with practical device application potential.

The application discloses a chain-like core-shell structure crystal and a preparation method and application thereof, the crystal is chloroethyl HDABCO-sodium bromofluoroborate, a structural formula of the crystal is [CH2ClCH2N(CH2CH2)3NH]4·[(Na6Br)(BF4) 13 ], a molecular structure presents a one-dimensional chain framework with infinite extension, adjacent chains are connected through N-H...F linear hydrogen bonds and chloroethyl-HDABCO, so that the compound has polarity and has a mid-infrared second-order nonlinear effect. In addition, the ultraviolet band edge absorption of the material is close to the near ultraviolet region, so that the material is expected to be close to inorganic ultraviolet nonlinear optical materials. The crystal is obtained through room temperature volatilization crystallization, has good thermal stability, and has potential application values in the fields of laser frequency doubling conversion, electro-optic modulators, deep ultraviolet nonlinear optics and shutter used for high-speed photography.

A single-material-double-process parametric laser-wavelength converter includes a pump-laser source, a nonlinear optical material, a first optical reflective element, and a second optical reflective element. The pump-laser source is configured to emit a pump-laser pulse light. The nonlinear optical material receives the pump-laser pulse and generates a signal-laser pulse and a partially depleted pump-laser pulse through optical parametric amplification. The first optical reflective element is configured to reflect the signal-laser pulse back to the same nonlinear optical material. The second optical reflective element is configured to reflect the partially depleted pump-laser pulse back to the same nonlinear optical material. With an appropriate adjustment on the reflecting path lengths, the nonlinear optical material is configured to receive the temporally synchronized signal-laser pulse and the partially depleted pump-laser pulse to generate an idler output through difference frequency generation. Both optical parametric amplification and difference frequency generation occur in the same nonlinear optical material.

This application discloses an inorganic compound crystal, its preparation method, and its applications. The inorganic compound crystal has the chemical formula Ga2(OH)(TeO3)(Te2O5)Br, belongs to the orthorhombic crystal system, has a space group of Pca21, and unit cell parameters α=β=γ=90°, Z=4. The inorganic compound crystal is prepared using a hydrothermal method. Under 1064nm laser irradiation, the powder frequency doubling intensity of the inorganic compound crystal Ga2(OH)(TeO3)(Te2O5)Br is 9.8 times that of KH2PO4(KDP), and phase matching can be achieved, indicating its significant potential application value as a nonlinear optical material.

The invention discloses an organic and inorganic compound crystal (H11C4N2) CdI3 as well as a preparation method and application thereof. The organic and inorganic compound crystal is a hybrid crystal, the chemical formula is (H11C4N2) CdI3, the organic and inorganic compound crystal belongs to a monoclinic system, the space group is Cc, and the cell parameters are as follows: a = 14.36-14.38, b = 7.13-7.15, c = 13.77-13.79, alpha = gamma = 90 degrees, beta = 121.2-121.4 degrees, and Z = 4. The crystal is prepared by a hydrothermal method. The organic-inorganic hybrid crystal has excellent second-order nonlinear optical performance, can output very strong 532 nm laser under 1064 nm laser irradiation, has a powder SHG coefficient 6 times that of KH2PO4 (KDP), can realize phase matching, and is a second-order nonlinear optical material with potential application value.

This invention relates to a method for preparing a nonlinear optical material and its application, specifically a magnesium aminodiacetate dihydrate compound. The molecular formula of the crystal is Mg[NH2(CH2COO)2]·2H2O. The Mg[NH2(CH2COO)2]·2H2O crystal does not have a center of symmetry, belongs to the tetragonal crystal system, has a space group of P-421c, and has cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal of this invention has a large frequency doubling effect; at the same time, its ultraviolet absorption edge is 225nm, thus belonging to the tetragonal crystal system, with a space group of P-421c and cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal can achieve the second harmonic of Nd:YAG (λ=1.064μm); and it can be predicted that the Mg[NH2(CH2COO)2]·2H2O crystal can be used in the third harmonic generator of Nd:YAG.

The invention relates to a second-order nonlinear optical material crystal amino methanesulfonic acid as well as preparation and application thereof. The chemical formula of the crystal is O3SCH2NH3, the molecular weight of the crystal is 111.12, the crystal belongs to a monoclinic system, the space group of the crystal is Cm, the cell parameters are alpha = gamma = 90 degrees, beta = 129.7-131.7 degrees, Z = 2, and the cell volume of the crystal is structurally characterized in that the crystalline material is a three-dimensional frame formed by connecting [O3SCH2NH3] elements through hydrogen-bond interaction. The amino methanesulfonic acid crystal material has excellent optical performance, and under 1064nm laser irradiation, the powder frequency doubling intensity is about 3.8 times that of a KH2PO4 (KDP) crystal; under the irradiation of 532 nm laser, the frequency doubling strength of the powder is about 0.7 time of that of the beta-BaB2O4 (BBO) crystal, and phase matching can be realized. Besides, the crystal material has moderate birefringence at 546 nm, the ultraviolet absorption cut-off edge is smaller than 170 nm, and the crystal material has stable physical and chemical properties and has important application value in the photoelectric fields of photoetching, laser frequency conversion, environmental monitoring and the like.

This application discloses a diamond-like carbon (DLC) crystal material, its preparation method, and its application as an infrared nonlinear optical material, belonging to the field of crystal preparation technology. The DLC crystal material has a triclinic structure with the chemical formula AM5Q8; wherein A is selected from at least one of Na, K, Rb, and Cs; M is selected from at least one of Ga and In; and Q is selected from at least one of S, Se, and Te. This crystal material exhibits a frequency doubling effect 0.5-5 times that of AgGaS2 and a laser damage threshold 1-50 times that of AgGaS2, demonstrating significantly improved performance and making it a potential infrared nonlinear optical material.

The invention relates to the field of nonlinear optical materials, and discloses a mixed bonded isothiocyanate nonlinear optical crystal and a preparation method thereof.The preparation method comprises the following steps that a zinc source is dissolved in deionized water to obtain a zinc source solution, and a sulfur source is dissolved in deionized water to obtain a sulfur source solution; mixing the solutions, heating and stirring to form a [SZn4] covalent core precursor suspension; sequentially adding 1, 2, 4-triazole, thiocyanate and triethanolamine into the suspension liquid, and uniformly stirring; and placing the obtained mixture in a reaction kettle for temperature programming reaction and constant-temperature reaction, then performing temperature programming cooling to room temperature, and filtering, washing and drying to obtain the crystal. By constructing a stable [SZn4] covalent core and regulating and controlling directional arrangement of NCS-and C2H2N3 ligands, effective superposition of microscopic nonlinear polarizability is realized, so that the material obtains higher second harmonic response, the thermal stability of the crystal is improved, and the optical band gap is widened.

The present application relates to a kind of tunable porphyrin-cadmium complex maykine nanometer nonlinear optical material and its preparation and application, the rotatability of single bond in organic matter is designed two porphyrin-cadmium complex, and it is connected to the surface of two-dimensional few-layer maykine by substitution reaction key.The porphyrin-cadmium complex of one of them occurs rotation due to different bridging groups, different steric hindrance, induces the conjugation degree of organic component to change greatly, to cause two materials to generate response for different pulse scale (nanosecond and femtosecond) laser respectively.Compared with prior art, the material configuration is changed by bridging group in the present application, so as to change the coupling degree of material, excited state lifetime and its nonlinear optical performance, so that the material has selectivity for laser of different pulse scale, and has good application potential for the screening and switching type scene of complex laser.

The invention discloses an ultralow-threshold high-order nonlinear optical response composite thin film device and a preparation method thereof, and belongs to the technical field of nonlinear optical and micro-nano optical devices. The invention provides a high-performance thin-film device formed by compounding a gravity-assisted dielectric microsphere rapid large-area close-packed self-assembled array in a low-density solution medium and a high-order nonlinear luminescent material, the excitation threshold of the ultrahigh-order nonlinear luminescent material is remarkably reduced through the field enhancement effect of the dielectric microsphere array, and the performance of the high-performance thin-film device is improved. And meanwhile, the excellent high-order nonlinear optical response capability is kept. The high-order nonlinear optical material breaks through the limitation of the traditional high-order nonlinear optical material, greatly expands the practical application scene of the nonlinear optical technology, and has a wide industrialization prospect.

The invention provides a method for regulating and controlling the nonlinear absorption type of a DAST-based composite film and a preparation process of the DAST-based composite film, and relates to the technical field of nonlinear optical materials. The method comprises the following steps: compounding a guest photoelectric sensitive material DAST and a subject flexible material PMMA by adopting a blade coating technology to obtain a binary DAST / PMMA subject-guest composite film; during the process, the mass fraction of the object photoelectric sensitive material in the composite film is adjusted, so that mutual conversion between a nonlinear anti-saturated absorption behavior and a saturated absorption behavior of the composite film in a femtosecond trepanning Z scanning laser system is successfully realized. Compared with existing nonlinear absorption type regulation and control technologies such as band gap engineering of two-dimensional inorganic materials, micro-nano structure construction of organic materials, functional group modification and the like, the regulation and control method is simpler, lower in cost and more beneficial to industrial processing, and has good practical application potential in the fields of laser protection, laser mode locking, optical switches and the like.

The invention belongs to the field of nonlinear optical materials, and discloses a noble metal nanoparticle loaded chiral non-planar covalent organic framework composite material as well as a preparation method and application thereof. The composite material takes a chiral non-planar covalent organic framework as a carrier, and noble metal nanoparticles are uniformly distributed on the carrier; and the chiral non-planar covalent organic framework is R-TpPz, S-TpPz, R-TpDz or S-TpDz. The preparation method comprises the following steps: adding the chiral non-planar covalent organic framework into a water-soluble noble metal salt solution, stirring at room temperature in a dark place until noble metal ions are fully adsorbed into the chiral non-planar covalent organic framework, and airing at room temperature in a dark place; and placing the aired sample in a vacuum environment, and carrying out thermal reduction at 80-100 DEG C for 10-12 h to obtain a target product. The composite material is applied as a third-order nonlinear optical material. According to the invention, precious metal nanoparticles are creatively loaded in a chiral non-planar covalent organic framework, so that active regulation and control of nonlinear optical properties are realized.

The invention discloses a lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material and a preparation method thereof, the lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material belongs to a monoclinic system, the space group is Cm, the chemical formula is La0.1: Y0. 9Ca4O (BO3) 3, the frequency multiplication coefficient is 2 * KDP, the ultraviolet cut-off edge is less than 200 nm, and no absorption peak with the intensity greater than or equal to 0.2 cm <-1 > exists in the range of 200-2500 nm. Therefore, the lanthanum ion doped yttrium calcium oxide borate crystal can be used as a nonlinear optical material with a wide application prospect in the field of optical parameter chirped pulse amplification.

The application discloses application of In2Te5 crystal in preparation of a nonlinear optical device in an infrared wave band. The In2Te5 crystal belongs to a monoclinic system, a Cc space group, has a cell parameter of alpha = gamma = 90 DEG, beta = 91.65 DEG, z = 4, and a unit cell volume of 0.56. The In2Te5 crystal can be used as a nonlinear optical material in preparation of a nonlinear optical device, and its frequency doubling coefficient is about 2-3 times of that of a ZnGeP2 crystal and 15 times of that of an AgGaS2 crystal. The infrared transmission range of the In2Te5 crystal can reach 30 microns. The optical birefringence of the In2Te5 crystal can reach 0.56, so the In2Te5 crystal can be used as a good mid-infrared nonlinear optical material, a mid-infrared photoconductive material and a mid-infrared birefringent material, and can be widely applied in various nonlinear optical fields, especially in the nonlinear optical application in the mid-infrared wave band.

The invention relates to a one-dimensional pyrenyl organic framework nonlinear optical material as well as preparation and application thereof. The material is prepared from a pyrenyl amino monomer (Py) and different dialdehyde monomers (PTDE, PTBE and PDA) through direct Schiff base condensation reaction under a solvothermal condition, a series of one-dimensional linear organic framework material (COF) chain segments are constructed, and a thin film material is further prepared. The obtained material has highly ordered crystallinity, an expanded pi-conjugated skeleton and an obvious donor-acceptor (D-A) charge transfer channel. The one-dimensional pyrenyl D-A COF (Py-PTDE, Py-PTBE and Py-PDA) has the advantages that the one-dimensional pyrenyl D-A COF (Py-PTDE, Py-PTBE and Py-PDA) has the obvious RSA (Reverse Saturated Absorption) effect under the excitation of femtosecond laser (800 nm and 1550 nm) for the first time; compared with the prior art, in particular to a Py-PTDE material, the effective nonlinear absorption coefficient (beta eff) of the Py-PTDE material reaches 116.89 cm. GW <-1 > and 337.03 cm. GW <-1 > at 800 nm and 1550 nm respectively, so that the Py-PTDE material is obviously superior to a precursor material and another two COF materials, and shows a lower optical limiting threshold value at a near-infrared band. The excellent performance is mainly derived from more effective D-A interaction, narrower optical band gap and more efficient intramolecular charge transfer channel in the material. The material disclosed by the invention is simple in preparation method and high in repeatability, and the obtained COF film has excellent thermal stability and optical stability, can be directly used for preparing optical limiting devices and ultrafast optical response devices and can be applied to other three-order nonlinear optical fields.

This invention belongs to the field of inorganic nonlinear optical materials technology, and particularly relates to a deep ultraviolet-transmitting potassium scandium sulfate nonlinear optical crystal, its preparation method, and its applications. The crystal has the chemical formula K3Sc(SO4)3, belongs to the monoclinic crystal system, and has different space groups at different temperatures: the space group below 200K is Pc (No. 7), and the space group above 202K is Ia (No. 9). The phase transition temperature of the crystal is between 200 and 202K. The potassium scandium sulfate nonlinear optical crystal of this invention has excellent nonlinear optical performance, with a powder frequency doubling intensity of approximately 1.62 times KDP, a wide transmission range, and a short deep ultraviolet cutoff edge (190 nm), and can achieve frequency-doubled laser output of Nd:YAG (1064 nm) lasers.

The application discloses a deep-shift frequency super-resolution microscopic chip based on a nonlinear evanescent field and an imaging method thereof, and belongs to the field of shift frequency super-resolution microscopic imaging. The deep-shift frequency super-resolution imaging chip comprises, from bottom to top, a substrate layer, a nonlinear optical material film layer, a surface plasmon film system and a microstructure layer which are sequentially stacked. A polygonal hole slot is entirely provided in the central region of the surface plasmon film system and the microstructure layer, and the exposed part of the nonlinear optical material film layer serves as an imaging sample placement area. A plurality of groups of microstructures are engraved on the upper surface of the microstructure layer around the polygonal hole slot. The application utilizes the nonlinear four-wave mixing effect to excite, control and enhance the super-large wave vector evanescent field and applies the super-large wave vector evanescent field to shift frequency super-resolution imaging, solves the problem that the wave vector of the evanescent field provided by a natural waveguide material is limited and the larger the wave vector is, the weaker the signal is, and breaks through the resolution upper limit of the existing linear shift frequency super-resolution imaging technology under the premise of ensuring the imaging quality.

The application discloses a salt-containing chalcogenide crystal material, a preparation method thereof and application thereof as an infrared nonlinear optical material, and belongs to the technical field of crystal preparation. The salt-containing chalcogenide has a diamond-like structure; the chemical formula of the salt-containing chalcogenide is one of [A5X][M 14 Q 23 ], [A5BaX][M 18 Q 30 ], [A 13 BaX5][M 22 Q 38 ], [A 14 LiX5][M 22 Q 38 ]; wherein A is at least one selected from Na, K, Rb and Cs; X is at least one selected from Cl, Br and I; M is at least one selected from Ga and In; and Q is at least one selected from S, Se and Te. The NLO effect of the material is 0.3-10 times that of a commercial AgGaS2, the laser damage threshold is 1-50 times that of AgGaS2, and the comprehensive performance is greatly improved, so that the material is a potential infrared NLO material.

This invention provides a porphyrin polymer near-infrared organic nonlinear optical material, its preparation method, and its applications. The electron donor-acceptor type organic three-component conjugated polymer of this invention possesses near-infrared organic nonlinear optical properties and can be used as a laser limiting material in the field of laser protection.

The invention belongs to the field of nonlinear optical materials, and discloses a broadband photoresponse CuS / MXene composite nonlinear optical material and a preparation method and application thereof. According to the preparation method, few-layer Mo2TiC2 MXene, copper chloride and sodium sulfide are used as reaction raw materials, an aqueous solution containing cetyltrimethylammonium chloride is used as a reaction solution, and the catalyst is prepared through a coprecipitation method. The obtained CuS / MXene composite nonlinear optical material is of a zero-dimensional / two-dimensional heterostructure and comprises few layers of Mo2TiC2 MXene and CuS nanoparticles loaded on the surface of the Mo2TiC2 MXene. The CuS / MXene composite material has the properties of stable structure, broadband optical absorption and ultrafast carrier response, shows an excellent broadband optical nonlinear effect, can be designed into an ultrahigh-speed, high-parallelism and low-loss broadband nonlinear photonic device, and has a wide application prospect in all-optical communication, photon calculation, quantum optics and the like.

The invention discloses application of a mercury-aluminum-based compound in a middle and far infrared nonlinear optical material, and belongs to the technical field of optical materials, and the chemical formula of the mercury-aluminum-based compound is HgAl2Q4; wherein the Q is S, Se or Te; and the wavelength of the middle and far infrared rays is 3-12 microns. The HgAl2Q4 nonlinear optical crystal prepared by the invention has excellent optical performance, has a stronger nonlinear optical effect, realizes the balance between a frequency-doubled effect and a laser damage threshold, can realize efficient frequency conversion, and has a greater potential application value.

This invention relates to the field of semiconductor technology, and provides an electro-optic modulator and its manufacturing method. In one embodiment, the electro-optic modulator includes a hybrid waveguide and electrodes located on both sides of the hybrid waveguide. The manufacturing method includes: providing a first component, the first component comprising at least a silicon layer and conductive wiring structures located on both sides of the silicon layer; providing a second component, the second component comprising a nonlinear optical material layer and conductive wiring structures located on both sides of the nonlinear optical material layer; bonding the first component and the second component together, wherein the silicon layer and the nonlinear optical material layer are stacked together to form the hybrid waveguide, and the conductive wiring structures located on both sides of the silicon layer are electrically connected to the conductive wiring structures located on both sides of the nonlinear optical material layer to form the electrodes. Using the embodiments of this invention, a small-size, high-efficiency, low-power electro-optic modulator can be integrated into a silicon photonic chip.

The invention provides a method for generating a strong second-order nonlinear optical effect based on a centrosymmetric material and application of the method. According to the invention, two intrinsic centrosymmetric two-dimensional materials are combined to construct an interface coupling structure, and a strong and controllable second-order nonlinear optical effect is spontaneously induced through an internal interface coupling effect. The innovation gets rid of dependence on inherent non-centrosymmetric materials, the selection range of nonlinear optical materials is expanded, and the process does not need a complex external excitation source. Besides, the accurate regulation and control relation between nonlinear optical response and the number of material layers is disclosed for the first time, and identification and customization of interface induction symmetry are achieved through analysis of polarization resolution SHG patterns. Therefore, the technical scheme of the invention not only provides a new method for generating the nonlinear effect, but also provides a set of predictable and controllable complete technical system from material selection and structural design to performance optimization.

A system and methods for low noise multi-channel optical signal amplification using an optical parametric amplifier are described. A waveguide etched into a ϰ(2) nonlinear optical material, such as thin film lithium niobate (TFLN), provides confined optical parametric amplification using a pump laser to amplify multi-channel optical signals of lower energy. Noise and crosstalk between channels within the OPA waveguide amplifier can be reduced if the OPA waveguide physical dimensions, along with the optical properties of the waveguide material, are adjusted to create a group velocity mismatch (GVM) between the propagating pump light and the amplified signal channels. OPA waveguide designs with larger GVM reduces crosstalk between modes in the waveguide, reducing noise, as measured by the error vector magnitude (EVM), and improving signal fidelity for the amplified optical signals.

The application relates to a method for enhancing the nonlinear optical performance of SnS2 nanosheets through electrostatic doping. First, SnS2 nanosheets are prepared on a fluorine-doped tin oxide (FTO) substrate by a chemical vapor deposition method, and then hydrogen ion intercalated SnS2-H + The electrostatic doping causes the band gap to shrink and a strong built-in electric field to be generated, so that the nonlinear optical performance of the material is enhanced. In addition, the saturated absorption response of the material enables the application to an optical neural network as a nonlinear activation function, and exhibits application potential in machine learning tasks. The SnS2-H + The application establishes a promising and convenient nonlinear optical material, and provides new insights for the design exploration and simple synthesis of high-performance nonlinear absorption materials.

The invention belongs to the field of inorganic chemistry and the field of nonlinear optical materials, particularly provides a niobium oxytellurite sulfate second-order nonlinear optical crystal and a preparation method thereof, and aims to solve the problem that an existing tetrahedron-based nonlinear optical crystal material is small in birefringence and / or relatively weak in nonlinear optical response. The chemical formula of niobium oxytellurite sulfate is Nb2O2 (TeO3) 2 (SO4), the crystal structure is a non-centrosymmetric structure and belongs to a monoclinic system, and the space group is Cc; the crystal material has a moderate frequency-doubled effect and can realize phase matching; meanwhile, the material shows a remarkable birefringence characteristic, has a relatively wide ultraviolet transmission window and relatively high stability, and has a wide application prospect in the fields of laser frequency conversion, photoelectric modulation, laser signal holographic storage and the like; in addition, the niobium oxytellurite sulfate crystal material can be prepared by a hydrothermal method, and is simple in process, mild in preparation condition and easy to implement.

The application discloses a rubidium zinc sulfate compound, a nonlinear optical crystal of the rubidium zinc sulfate compound, and a preparation method and application of the rubidium zinc sulfate compound. 12 The rubidium zinc sulfate compound and the nonlinear optical crystal of the rubidium zinc sulfate compound both have a molecular formula of Rb2Zn2S3O 12 , do not have a symmetry center, are crystallized in a monoclinic crystal system, have a space group P21, have a unit cell parameter of Z=2, and have a unit cell volume of 2. The alkali metal sulfate salt usually has a large band gap, and the ultraviolet transmittance range thereof can be extended to about 150 nm, and is a candidate material for exploring UV or DUV optical crystals. In addition, the alkali metal sulfate salt has the properties of low melting point and high solubility, and therefore can be synthesized by using a high-temperature solution method, a hydrothermal method or an aqueous solution method, and the synthesis condition is relatively mild. Therefore, the alkali metal sulfate salt is an effective means for designing deep ultraviolet nonlinear optical materials.

The application discloses a metal porphyrin-pyrrolopyrrolidone conjugated compound and a preparation method and application thereof. The compound has the structure shown in the following formula I or formula II: wherein R1 is selected from * represents a connecting position of a carbon-carbon triple bond; represents an aromatic group; R represents an alkyl group; and M represents a heavy metal atom. In the compound structure, the construction of an electron donor-acceptor conjugated system and the introduction of the heavy metal atom can effectively promote intramolecular charge transfer absorption, and due to the heavy metal atom effect, a singlet excited state is converted into a long-lifetime triplet excited state through intersystem crossing, effective triplet excited state absorption is generated, and then the compound has high-performance nonlinear optical material.

The invention belongs to the technical field of laser protection devices, and particularly relates to a device and a method for measuring response time and a protection threshold value of a laser protection device in real time, which are based on a nonlinear optical material and can detect the response time and the protection threshold value of the laser protection device through real-time change of transmittance. For example, for a laser protection device based on phase change of a vanadium dioxide film, in the laser protection process, vanadium dioxide is subjected to a phase change process from a semiconductor phase to a metal phase, the phase change process shows that the transmittance of the laser protection device changes, and the transmittance of the laser protection device is continuously reduced along with the phase change process, so that the phase change of the vanadium dioxide film is reduced. The response time and the protection threshold value of the laser protection device are determined by measuring the time evolution process of the transmittance under different laser intensities. According to the invention, the response time and the protection threshold of the laser protection device can be rapidly determined in real time.