210 results about "Chalcogenide glass" patented technology

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 present application relates to a kind of on-chip photo-thermal gas sensor and on-chip photo-thermal gas sensor assembly, the refractive index of the upper waveguide material layer of sensor ridge waveguide layer is greater than the refractive index of lower waveguide material layer, can support TM mode pump light and TE mode probe light simultaneously. That is, both high absorption of pump light and weak influence of probe light on the gas to be measured are considered, and the detection accuracy of the gas is improved. Moreover, a simpler waveguide structure is used, and the waveguide preparation process is simple, and the waveguide loss is relatively low. Compared with the photo-thermal interference method in optical fiber sensing, the interaction between pump light and the gas to be measured is greatly improved, the length of the detection waveguide is greatly shortened while ensuring high sensitivity, and the device size can be reduced to micrometer level. In addition, the waveguide structure of the on-chip photo-thermal gas sensor disclosed in the present application is prepared from chalcogenide glass, which has more obvious advantages for gas detection in the mid-infrared waveband.

The present invention provides a Ge-As-Se-CsCl glass ceramic and a preparation method thereof, the Ge-As-Se-CsCl glass ceramic comprises a matrix and CsCl crystals uniformly dispersed in the matrix, the matrix is Ge-As-Se chalcogenide glass, the CsCl crystals are uniformly dispersed in the matrix in a nanometer form, the molar composition of the Ge-As-Se-CsCl glass ceramic is represented by a chemical formula: (1-y) Ge0. 2AsxSe (0.8-x)-yCsCl, x is in a range of 0.1-0.7, y is in a range of 0.05-0.2, y is in a range of 0-0.2, and y is in a range of 0-0.2. Compared with the prior art, the Ge-As-Se-CsCl glass ceramic prepared by two-stage heat treatment crystallization disclosed by the invention has the advantages that on one hand, the Ge-As-Se-CsCl glass ceramic has good infrared permeability, the hardness of the Ge-As-Se-CsCl glass ceramic can be greatly improved, and the application range of chalcogenide glass ceramic is widened.

The invention relates to the technical field of preparation of infrared optical materials, in particular to large-size highly-homogenized infrared chalcogenide glass as well as a preparation method and application thereof. The raw materials are purified by adopting a low-temperature reduction method or a low-temperature solid fractionation method, so that impurity residues in the raw materials are effectively reduced, and the precision requirement of the large-size infrared chalcogenide glass is met; a supercooling atmosphere standing curing method is adopted for cooling curing, so that the condition that the infrared chalcogenide glass has stripe or crack defects is avoided, and the quality of the glass blank is improved; and the internal thermal stress of the glass material is eliminated through a process of combining two times of annealing with a special mold, and the optical uniformity and the permeability of the infrared chalcogenide glass are improved. According to the technical scheme, the problems that in the existing large-size infrared chalcogenide glass preparation process, the raw material purification effect is poor, many residues exist, stripes and cracks are prone to occurring in the synthesis process, and then the optical uniformity and the internal quality of the infrared chalcogenide glass are affected are effectively solved.

The invention discloses Ge-Sn-Se-S acousto-optic chalcogenide glass, the chemical composition formula of the Ge-Sn-Se-S acousto-optic chalcogenide glass is Ge20SnxSe80-x-ySy, x and y respectively represent molar fractions of Sn and S, x is equal to 5-12.5, y is equal to 0-25, and a basic network unit of a glass frame of the Ge-Sn-Se acousto-optic chalcogenide glass is of a stable tetrahedral structure with Ge or Sn as the center. The acousto-optic chalcogenide glass is large in composition regulation and control range, easy to form, non-toxic, environment-friendly, green and quaternary chalcogenide glass system, high in linearity and refractive index and high in acousto-optic performance, the acousto-optic quality factor M2 under the wavelength of 1550 nm is 211.8 * 10 <-18 > s < 3 > / g to 348.9 * 10 <-18 > s < 3 > / g, the ultrasonic attenuation alpha under the ultrasonic frequency of 10 MHz is 0.72 dB / cm to 4.89 dB / cm, the laser damage threshold value is 2.94 J / cm < 2 > to 15.54 J / cm < 2 >, and the acousto-optic chalcogenide glass can be used for preparing the acousto-optic chalcogenide glass. The material has the potential of being applied to acousto-optic devices for high-power laser modulation, and can be widely applied to the acousto-optic field as an acousto-optic medium.

The invention discloses a combined polishing machining method for a chalcogenide glass aspheric surface. The combined polishing machining method comprises the following steps that S1, the surface damage depth of the chalcogenide glass aspheric surface is obtained; s2, whether the surface damage depth is larger than 100 nm or not is judged, if yes, the step S3 is executed, and if not, the step S4 is executed; s3, a small grinding head is used for polishing and shaping till the surface damage depth is smaller than 100 nm; s4, acquiring the surface shape precision of the chalcogenide glass aspheric surface; s5, judging whether the surface shape precision is smaller than the target precision or not, if yes, executing the step S7, and if not, executing the step S6; s6, magneto-rheological polishing and shaping are used, and the step S1 is executed; and S7, a small grinding head is used for polishing and fairing, and the process is finished. According to the method, the chalcogenide glass scrapping risk can be reduced, and the chalcogenide glass surface shape precision can be greatly improved.

The present invention relates to: a high-entropy chalcogenide glass electrocatalyst for oxygen generation in a proton exchange membrane water electrolyzer; and a method for manufacturing same, wherein high-entropy chalcogenide is formed through a combination of at least five types of transition metal precursor and at least one type of chalcogen precursor and is thus imparted. Accordingly, it is possible to manufacture an electrocatalyst having improved OER performance and stability compared to conventional electrocatalysts.

The invention discloses a preparation method of a high-positioning-precision line-plane conversion type infrared chalcogenide optical fiber image-transmitting bundle. The preparation method comprises the following steps: preparing an infrared chalcogenide glass optical fiber, manufacturing a precision positioning wire arrangement disc and a precision positioning plane array sheet arrangement mold, preparing a single-layer optical fiber sheet and preparing a line-plane conversion type optical fiber bundle. According to the preparation method, V-shaped grooves are engraved in the surface of a cylinder of a metal wire arrangement disc at equal intervals, then a single-layer optical fiber sheet containing a large number of optical fiber monofilaments is automatically wound under the cooperation of a high-precision optical fiber winding machine, and then the two ends of the single-layer optical fiber sheet are stacked according to an area array mode and a linear array mode to form the line-plane conversion type optical fiber image transmitting bundle. The manual participation degree in the filament arranging process is reduced, and the preparation efficiency of the optical fiber image-transmitting bundle can be greatly improved. The maximum linear array length of the oversized and high-positioning-precision line-plane conversion type infrared chalcogenide fiber image-transmitting bundle prepared by the method is more than 700mm, and the absolute positioning precision is superior to + / -4 [mu] m.

The invention relates to a small-sized light-weight large-target-surface infrared athermalization optical system, and the optical system consists of a first meniscus positive lens, a meniscus negative lens, a second meniscus positive lens and a third meniscus positive lens which are sequentially and coaxially arranged from an object side to an image side, the second meniscus positive lens and the third meniscus positive lens are the same lens, the first meniscus positive lens, the second meniscus positive lens and the third meniscus positive lens are all made of chalcogenide glass IRG206, and the optical system ensures that edge imaging is clear and the image surface diameter reaches 20mm through optimal arrangement of focal power and optical materials of all the lenses and intervals among all the lenses, so that the image quality is improved. The long-wave infrared imaging device can adapt to a 1280 * 1024 array and a long-wave uncooled infrared detector with the pixel size of 12 microns, and has the advantages of high imaging quality, small size and light weight.

The invention relates to a chalcogenide glass leftover material recycling and reusing process, which comprises the following steps: wiping the surface of a blocky leftover material, soaking in acetone, carrying out ultrasonic spray cleaning, draining and drying; the dried blocky leftover materials are loaded into a quartz loading pipe and stopped by a quartz filter element, and the quartz filter pipe is vacuumized and then welded and sealed; the welded and sealed quartz filter tube is vertically arranged in a purification furnace, the blocky leftover materials are heated and melted to form molten glass, the molten glass flows downwards to penetrate through the quartz filter element to be filtered and drops into the quartz collection tube, and when heat preservation is finished, the molten glass is completely collected into the quartz collection tube; taking out the quartz filter tube for quenching and cooling; separating the quartz charging pipe from the quartz collecting pipe; putting the separated quartz collecting tube into a rocking furnace; taking out the quartz collecting tube from the rocking furnace, and quenching and forming; putting the quartz collecting tube into an annealing furnace; and crushing the quartz collecting tube and taking out the glass rod.

The invention provides a chalcogenide glass optical element suitable for an anti-reflection wave band of 8-12 microns as well as a preparation method and application of the chalcogenide glass optical element. The chalcogenide glass optical element comprises a chalcogenide glass substrate and anti-reflection films arranged on the surfaces of the two sides of the chalcogenide glass substrate, and each anti-reflection film is sequentially provided with a first Ge film layer, a first ZnS film layer, a second Ge film layer, a second ZnS film layer, a YbF3 film layer and a third ZnS film layer in a stacked mode in the direction away from the chalcogenide glass substrate. A composite protective film is arranged on the surface, far away from the chalcogenide glass substrate, of any anti-reflection film, and the composite protective film comprises a ZrO2 film layer, a SiO2 film layer and an AF film which are sequentially stacked in the direction far away from the anti-reflection film. The chalcogenide glass optical element provided by the invention can meet the requirement of high environment measurement, the salt mist environment measurement duration of the chalcogenide glass optical element exceeds 1500h, the friction capacity exceeds 5000 times (2500 times of round trip), and the average transmittance exceeds 92%.

The present invention discloses an infrared optical imaging system for an unmanned aerial vehicle, belonging to the field of unmanned aerial vehicles. The system includes an infrared optical imaging system arranged on the support of the unmanned aerial vehicle carrier. The system comprises a radome, a lens group and a detector. The radome is installed at the head of the unmanned aerial vehicle, and its front surface and rear surface are concentric spherical surfaces. The lens group includes a first lens, a second lens and a third lens which are arranged coaxially in sequence and are in a meniscus shape. The first lens and the third lens are positive lenses, and the second lens is a negative lens. The rear side surface of the first lens, the front side surfaces of the second lens and the third lens are all aspherical surfaces. The detector is located behind the lens group and receives the optimized infrared radiation for imaging. Through the material combination of single crystal silicon, single crystal germanium and chalcogenide glass IRG206, the passive thermal compensation structure, as well as the miniaturized and lightweight design, the present invention improves the target detection accuracy and equipment reliability in complex environments while reducing the cost.

The present application relates to an optical glass preparation device and a preparation method in the technical field of infrared glass preparation. The optical glass preparation device includes: a heating furnace, which forms a furnace cavity therein; a material container; a swing rotation mechanism, which is arranged in the furnace cavity and is used for fixing the material container and driving the material container to swing and rotate to mix materials; a melt quenching mechanism, which is communicated with the furnace cavity and is used for rapidly cooling the melt formed by melting the materials in the material container. The optical glass preparation device and the preparation method of the present application can obtain chalcogenide glass products with good optical uniformity, stable transmission performance, and large size, and reduce operation risks and improve safety.

The invention discloses a preparation method of a chalcogenide glass dual-band wide-spectrum antireflection film. The method comprises the steps of substrate cleaning, vacuum baking, ion source cleaning, sequential deposition of nine layers of thin films with specific materials and thicknesses, constant-temperature treatment after plating, cooling and workpiece taking, and double-sided plating. According to the invention, by optimizing the film system design and key process parameters, especially selectively using the ion source to assist deposition, the anti-reflection film with high transmittance (higher than 91.7% and 94.6% respectively) at the two wavebands of 3-5 [mu] m and 8-12 [mu] m is successfully prepared on the chalcogenide glass substrate. The film layer is strong in adhesive force, high in compactness, capable of passing multiple strict environmental reliability tests, excellent in comprehensive performance, good in process repeatability and suitable for a high-performance infrared optical system.

The application provides a Ge-As-Se-CsCl glass ceramic and a preparation method thereof, which comprises a base and CsCl crystals uniformly dispersed in the base; the base is a Ge-As-Se chalcogenide glass; the CsCl crystals are uniformly dispersed in the base in a nano form; the molar composition of the Ge-As-Se-CsCl glass ceramic is represented by a chemical formula as follows: (1-y)Ge 0.2 As x Se (0.8‑x) -yCsCl, the range of x is 0.1-0.7, and the range of y is 0.05-0.2. Compared with the prior art, the Ge-As-Se-CsCl glass ceramic prepared by two-stage heat treatment crystallization disclosed by the application can ensure that the Ge-As-Se-CsCl glass ceramic has good infrared transmittance, can greatly improve the hardness of the Ge-As-Se-CsCl glass ceramic, and widens the application range of the chalcogenide glass ceramic.

A method for improving the adhesion of a chalcogenide glass coating includes the steps of: step one, placing a chalcogenide glass lens to be coated in a cleaning solution for soaking; step two, wiping the surface of the soaked chalcogenide glass lens clean with a piece of absorbent cotton; step three, placing the wiped chalcogenide glass lens in a mixed solution of acetone and alcohol for storage; step four, removing the chalcogenide glass lens from the mixed solution and performing ultrasonic cleaning during the preparation time before coating; step five, removing the ultrasonically cleaned chalcogenide glass lens and performing IPA drying; and step six, removing the IPA-dried chalcogenide glass lens and performing coating. Thus, the adhesion between the coating and the chalcogenide glass lens after coating of the chalcogenide glass is improved.

The utility model discloses a catadioptric thermal imaging optical system, which comprises a diaphragm, a second reflector, a lenslet and a first reflector which are sequentially distributed at intervals along an optical axis S from an object side to an imaging surface, and the outer diameter of the diaphragm and the outer diameter of the first reflector are larger than the outer diameter of the second reflector. A through hole is dug in the middle of the first reflector, a small lens is arranged on the left side of the through hole, the diaphragm is made of chalcogenide glass or germanium materials, the first reflector is an aspheric reflector with a concave face, the second reflector is an aspheric reflector with a convex face, and the concave face faces the diaphragm and is opposite to the convex face. Light emitted from the object side and with the wavelength ranging from 8 micrometers to 14 micrometers penetrates through the periphery of the diaphragm to reach the first reflector, is reflected by the concave face for the first time to reach the second reflector, is reflected by the convex face for the second time and then is refracted by the small lens to be imaged on the imaging face, the manufacturing cost is low, and the imaging quality is good.

The invention discloses chalcogenide glass and a preparation method thereof, an optical element and an imaging device. The chalcogenide glass comprises the following constituent elements: germanium (Ge) with the molar percentage of 5 mol% to 15 mol%; arsenic As, the molar percentage of which is 40 mol% to 55 mol%; tellurium (Te), the molar percentage of which is 30 mol% to 50 mol%; and selenium Se, the molar percentage of which is 0.1 mol% to 10 mol%. The refractive index of the chalcogenide glass in the infrared band is larger than 3, and the refractive index is uniform. The refractive index of the chalcogenide glass can be improved, the application scene of the chalcogenide glass is expanded, germanium glass can be replaced by the chalcogenide glass in an infrared optical system using the germanium glass, and therefore the cost of the infrared optical system can be reduced.

The application belongs to the technical field of infrared coating and discloses a chalcogenide glass double-waveband antireflection film, which comprises film system structures symmetrically arranged on two sides of a chalcogenide glass substrate, wherein the film system structures are sequentially arranged from the inside to the outside of the chalcogenide glass substrate as a first Y2O3 layer, a second YbF3 layer, a third ZnSe layer, a fourth YbF3 layer, a fifth ZnSe layer, a sixth YbF3 layer, a seventh Y2O3 layer, an eighth YbF3 layer, a ninth ZnSe layer, a tenth YbF3 layer and an eleventh ZnSe layer. The film system structures arranged on the chalcogenide glass substrate can improve the transmittance of optical lenses in specific wavebands (1.064 μm waveband and 7.7-10.5 μm waveband), thereby meeting market demands.

The invention discloses a chalcogenide glass material preparation method, which comprises: 1) raw material preparation: weighing various raw materials according to a raw material ratio, uniformly mixing, placing the mixed raw materials and a stirring device in a quartz ampoule bottle, and carrying out vacuum pumping packaging; 2) high-temperature melting and quenching: heating the quartz ampoule bottle, and melting the packaged mixed raw materials at high temperature; after heating, quenching the quartz ampoule bottle and the melt packaged in the quartz ampoule bottle by using strong wind or ice water to obtain a semi-finished chalcogenide glass product; and 3) annealing and cooling: putting the quartz ampoule bottle and the semi-finished glass into an annealing furnace for annealing, cooling the quartz ampoule bottle and the semi-finished glass to room temperature after annealing is finished, then opening the quartz ampoule bottle, and taking out the chalcogenide glass and the stirring device. The preparation method has the beneficial effects that the glass uniformity is improved, the swinging time in the preparation process is shortened, and the preparation efficiency is improved.

The invention discloses a terahertz non-reciprocal transmission regulator with a double-quasi bound state effect and a method thereof, and belongs to the field of terahertz technologies and devices. The terahertz non-reciprocal transmission device with the double quasi bound state effect is formed by periodically arranging and splicing a plurality of unit structures, and each unit structure is composed of amorphous chalcogenide glass arsenic selenide with unequal rectangular grooves. According to the invention, the nonlinearity of the arsenic selenide material is combined with the asymmetry of the amorphous chalcogenide glass arsenic selenide unit with unequal grooves to generate a double quasi bound state effect, and the first quasi bound state effect and the second quasi bound state effect are utilized to realize the terahertz wave nonreciprocal transmission regulation and control of double frequency points at the same time. The terahertz non-reciprocal transmission device with the double quasi bound state effect designed by the invention is simple in structure, terahertz wave transmission can be regulated and controlled only by changing the incident power of terahertz waves without adding any external bias, and the research of an integratable non-reciprocal device is facilitated.

The invention discloses a purification method of a Ge-Sb-Se chalcogenide glass material. The purification method comprises the following steps: step 1, a raw material preparation stage; step 2, purification operation; step 3, mixture smelting operation; step 4, annealing operation; the method for purifying the chalcogenide glass material has the beneficial effects that the method for purifying the chalcogenide glass material in the technical scheme is simple to operate and easy to implement, and by applying the method for purifying the chalcogenide glass material, the traditional deoxidant and dehydrogenation agent are not required to be used, and new impurities are not required to be introduced, so that the purification effect of the chalcogenide glass material is effectively improved.

The invention belongs to the technical field of chalcogenide glass processing, and discloses a cutting fluid for processing a chalcogenide glass aspheric lens with the diameter larger than 100 mm and application of the cutting fluid, the cutting fluid for processing the chalcogenide glass aspheric lens with the diameter larger than 100 mm comprises isoparaffin and isopropyl palmitate, and the mass ratio of the isoparaffin to the isopropyl palmitate is (1-3): (4-5). The isoparaffin and the isopropyl palmitate are compounded, the lubricating effect of the cutting fluid can be effectively improved, so that a machining tool and a machining workpiece are protected, the cutting fluid has the effect of promoting chip removal in the machining process, and the situation that the machining quality is reduced due to too many chips on the machining workpiece is avoided.

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 utility model discloses an annealing device for chalcogenide glass production, and relates to the technical field of high-purity infrared chalcogenide glass preparation, the annealing device comprises an annealing kiln assembly and exhaust assemblies, the exhaust assemblies are symmetrically arranged at the front and back of the top of the annealing kiln assembly, and the surface of the top of a track is connected with a walking plate trailer. A stabilizing frame is erected on the top of the walking plate trailer, and meanwhile limiting frames are installed on the surface of the top of the walking plate trailer in a bilateral symmetry mode. According to the annealing device for chalcogenide glass production, the exhaust assembly is mounted at the top of the annealing kiln assembly, so that after glass is returned and heated by the annealing kiln assembly, heat in the annealing kiln main body is discharged as required, and the heat discharge speed is controlled, so that convenient annealing operation is realized, the use convenience of the device is guaranteed, and the production efficiency is improved. In addition, a stabilizing frame and a limiting frame are installed on the surface of the top of the walking plate trailer, adjustment can be conducted by being matched with the size of the glass within a certain adjustment range, and therefore stability and safety in the moving and transporting process are guaranteed.

The invention provides chalcogenide glass with a negative refractive index temperature coefficient as well as a preparation method and application of the chalcogenide glass, and belongs to the technical field of infrared chalcogenide glass. The chemical formula of the chalcogenide glass provided by the invention is As < x > Se < 100-x >, and x ranges from 20 to 36. By optimizing the chemical formula of the chalcogenide glass, the refractive index and the dn / dT value of the chalcogenide glass can be controlled, and the dn / dT value of the chalcogenide glass is negative, so that the characteristic that the refractive index generated by a conventional lens changes along with the temperature can be effectively compensated, and the heat effect is reduced or even eliminated; the linear refractive index value of the chalcogenide glass provided by the invention is reduced along with the increase of the dn / dT value, so that the chalcogenide glass can be used as a passive athermalization lens element in an infrared system, and is of great significance to athermalization of the system. The result of the embodiment shows that the dn / dT value of the chalcogenide glass provided by the invention is-45 to-19 ppm / K, and the refractive index of the chalcogenide glass is 2.61 to 2.68.

The present invention relates to a wide-band infrared optical system. Along the optical axis of this optical system, a positive-power meniscus lens L1, a negative-power meniscus lens L2, a positive-power meniscus lens L3, a filter, a detector protection window, a diaphragm and an image plane are sequentially arranged from the object side to the image side; the front surface of the positive-power meniscus lens L1 is an aspherical surface, the front surface of the negative-power meniscus lens L2 is a diffractive surface, and the surfaces of other lenses are spherical surfaces; the negative-power meniscus lens L2 is made of a chalcogenide glass material, and other optical elements are made of zinc sulfide. The structure of the present invention is simple and easy to assemble and align, the imaging quality is excellent, chromatic aberration and other monochromatic aberrations can be corrected well, the distortion is small, and 100% cold stop efficiency can be achieved.

The invention discloses a medium-wave infrared microscope lens for high-speed temperature measurement, and belongs to the field of infrared temperature measurement. The lens group is mainly made of germanium, monocrystalline silicon and chalcogenide glass. Comprising six spherical lenses and two aspherical lenses, wherein the sixth lens and the eighth lens are double-sided aspherical lenses; the first lens, the second lens, the third lens and the fifth lens are made of monocrystalline silicon. The fourth lens, the sixth lens and the eighth lens are made of germanium; the seventh lens is made of IRG24 chalcogenide glass; the lens group is formed by coaxially installing and arranging first to eighth lenses in sequence. The device has the advantages of high magnification and large numerical aperture, can realize extremely high light inlet efficiency and imaging quality, and ensures the precision of temperature field measurement in a micron-sized high-speed scene. The device has the advantage of long working distance, so that the device is more suitable for measurement scenes needing protective measures and other front optical instruments.

The invention discloses a preparation process for evaporating a cut-off film on the surface of chalcogenide glass, and particularly relates to the technical field of infrared optical detection.The preparation process comprises the following steps that S01, the initial vacuum degree before execution of a coating machine is superior to 5.0 * 10 <-4 > Pa, the baking temperature ranges from 80 DEG C to 150 DEG C, and ion source parameters are set as follows: the cathode voltage ranges from 100 V to 300 V, and the ion beam current ranges from 1 A to 4 A; s02, before evaporation, carrying out ion bombardment on the lens chalcogenide glass for 3-10 minutes by the coating machine; s03, plating a first layer of Ge on the chalcogenide glass of the lens, and controlling the evaporation rate to be 0.2-0.8 nm / s; s04, plating a second layer of ZnS on the first layer of Ge, and controlling the evaporation rate to be 0.2-1.5 nm / s; s05, a third layer of YbF3 is plated on the second layer of ZnS, and the evaporation rate is controlled to be 0.2-1 nm / s; s06, plating a fourth layer of ZnS on the third layer of YbF3, and controlling the evaporation rate to be 0.2-1.5 nm / s; and S07, plating a fifth layer of Ge on the fourth layer of ZnS, wherein the evaporation rate is controlled to be 0.2-0.8 nm / s. The thin film provided by the invention effectively solves the problems of stress between film layers, film layer adhesive force and good spectral performance.

The application discloses a kind of middle wave infrared composite glass optical fiber and preparation method thereof, and the composite glass optical fiber is composed of fluoride glass core, fluoride glass inner cladding, chalcogenide glass outer cladding, polymer coating layer and infrared end cap.The difference between the thermal expansion coefficient of fluoride glass used for core, fluoride glass used for inner cladding and chalcogenide glass used for outer cladding is less than or equal to 4×10 ‑6 The temperature interval of any two of them has overlap. First, the fluoride glass rod of core is prepared by using melt quenching technology, then the inner cladding fluoride glass sleeve and outer cladding chalcogenide glass sleeve are prepared by using spin tube technology, then the optical fiber is drawn by using rod-in-tube method, and finally the infrared end cap is fused with the optical fiber. The composite glass optical fiber can effectively avoid the fluoride glass core and inner cladding from being eroded by water vapor in the air, thereby significantly improving the 3-5 μm laser power that can be transmitted by the optical fiber and greatly prolonging the service life thereof; the preparation method has low requirement on drawing equipment and low cost.