15 results about "Fluoride glass" patented technology

A method and a device for preparing a fluoride glass optical fiber preform by a tube suction method are provided. The method includes following steps: S1, heating and melting glass raw materials of outer cladding, inner cladding and a fiber core; S2, sucking to prepare the outer cladding; S3, sucking to prepare the inner cladding inside the outer cladding; S4, sucking to prepare the fiber core inside the inner cladding; and S5, annealing the outer cladding, the inner cladding and the fiber core to obtain a preform product.

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.

This invention discloses an unmanned aerial vehicle (UAV)-borne natural light fog visibility profile detector, belonging to the technical field of atmospheric monitoring equipment. The detector includes an airborne unit, which comprises an upper-level computer fixed above the UAV and a lower-level computer fixed below the UAV, connected by a cable to transmit power and signals. The upper-level computer includes an optical lens, a GPS module, a gyroscope attitude sensor, and the optical lens includes a fluorinated glass cosine scatterer, a filter, a light-collecting element, and a light signal acquisition circuit. The lower-level computer includes a temperature, humidity, and pressure sensor, a meteorological parameter conversion circuit, a data communication module, and a power supply. The airborne unit passively receives natural light radiation to invert the horizontal visibility, vertical visibility, and visible height of the fog, and combines this with the meteorological parameters collected by the temperature, humidity, and pressure sensor to achieve vertical fog structure measurement.

The application discloses a kind of radiation-resistant low-expansion fluoride glass and its preparation method, it is related to new type glass technical field.The fluoride glass provided in the application all component ingredients are fluorine-containing compounds, including ZrF4, BaF2, SrF2, LiF, AlF3, NaF, CaF2, CeF3And Na3AlF6, the mole percentage of each component is (40~55) :(10~15) :(10~15) :(5~10) :(5~10) :(2~5) :(3~5) :(5~10) :(5~10).The above raw materials are dried in vacuum, grinded and screened, ball milled, tube furnace melting, shaping, annealing treatment and other steps in the application, and excellent fluoride glass is prepared, and the preparation process of the application can reduce the impurities and internal stress in the prepared fluoride glass, ensure the stable performance of glass, and be suitable for optical, radiation-resistant and other related fields.

The invention provides a core-shell structure reflective microbead for a road marking coating and a preparation method thereof, and belongs to the technical field of road marking reflective materials, and the preparation method comprises the following steps: carrying out amination modification on the surface of a core layer of a fluorinated glass microbead through a silane coupling agent, and grafting a temperature-sensitive polymer outside a shell layer to obtain a temperature-sensitive core-shell reflective microbead. The invention provides a core-shell structure reflective microsphere for a road marking coating and a preparation method of the core-shell structure reflective microsphere. The visibility of the reflective microsphere in a complex climate is improved.

The application discloses a PVC / PMMA composite material which comprises the following components in parts by weight: PVC 80-90 parts; low polymerization degree PVC 5-15 parts; PMMA 30-40 parts; surface fluorinated glass fiber 10-25 parts; polytetrafluoroethylene 0.5-2.5 parts; stabilizer 0.5-3 parts; maleic anhydride grafting type compatilizer 3-6 parts; and the polymerization degree of the low polymerization degree PVC ranges from 400 to 700. The PVC / PMMA composite material has the advantages of good surface spraying performance and less surface floating fibers, and is suitable for preparing high-strength decorative parts, toys and the like.

This invention relates to the field of hollow-core optical fiber technology, and more particularly to a fluoride hollow-core antiresonant optical fiber and its fabrication method. The optical fiber comprises, from the inside out, an air core, an inner cladding, an outer cladding, and a protective coating; both the inner and outer cladding are made of fluoride glass free of monovalent alkali metal fluorides, and the refractive index of the fluoride glass is greater than that of the air core; the inner cladding is an array structure formed by multiple inner capillaries arranged in a ring-shaped periodic pattern around the air core; the outer cladding is a solid fluoride glass layer wrapped around the inner cladding; the inner and outer claddings are fixed together with epoxy resin; the fluoride glass includes ZrF4, ZnF2, BaF2, SrF2, CaF2, AlF3, and YF3. The advantages are: the use of deliquescent fluoride glass free of monovalent alkali metal fluorides solves the problems of easy moisture absorption and crystallization of traditional fluoride fibers, achieving low-loss transmission in the mid-infrared region at wavelengths of 2-5 μm and above.

The invention discloses radiation-resistant low-expansion fluoride glass and a preparation method thereof, and relates to the technical field of novel glass. All the components of the fluoride glass provided by the invention are fluorine-containing compounds, and the fluoride glass comprises ZrF4, BaF2, SrF2, LiF, AlF3, NaF, CaF2, CeF3 and Na3AlF6, and the mole percent of all the components is (40 to 55): (10 to 15): (10 to 15): (5 to 10): (5 to 10): (2 to 5): (3 to 5): (5 to 10): (5 to 10). The fluoride glass with excellent performance is prepared from the raw materials through the steps of vacuum drying, grinding and screening, ball milling, tubular furnace melting, forming, annealing treatment and the like, impurities and internal stress in the prepared fluoride glass can be reduced through the preparation process, stable glass performance is guaranteed, and the fluoride glass is suitable for the related fields of optics, radiation resistance and the like.

The application discloses a kind of high frequency copper-clad plate based on PTFE and preparation method thereof, belong to high polymer composite technical field.Its preparation method includes: using sol-gel method to combine polyethylene imine auxiliary preparation high-entropy oxide nanoparticles;Nanofiller with core-shell is prepared by fluorination modification after being coated by polydopamine;Hollow alumina-silica ceramic microspheres are modified by multiple fluorine-containing silane and fluorine shell layer doping;Polytetrafluoroethylene-based nanocomposite dispersion liquid is prepared by compounding fluorinated boron nitride nanosheet and hexagonal boron nitride flake;After gradient fluorinated silane treatment, glass fiber cloth is impregnated with dispersion liquid to prepare prepreg;After multilayer copper foil is stacked, it is formed by staged vacuum hot pressing.The obtained copper-clad plate dielectric layer is composed of fluorinated modified PTFE resin, multi-scale low-dielectric filler and surface fluorinated glass fiber, and has extremely low dielectric constant, extremely low dielectric loss, high peel strength, low water absorption and high thermal conductivity.

The invention provides a synthesis method of ammonium tetrafluoroaluminate, which comprises the following steps: heating high-purity aluminum in a dilute hydrogen fluoride solution in a water bath, titrating and precipitating the reaction product by using an ammonium fluoride solution, and finally filtering and drying to obtain high-purity ammonium tetrafluoroaluminate for fluoride glass. The preparation process is simple and convenient through a chemical synthesis method of aluminum fluoride and ammonium fluoride.

The application provides a kind of high transparency rare earth doped fluoride glass and its preparation method, belongs to glass technical field.The application selects calcium fluoride, magnesium fluoride and barium fluoride to cooperatively construct glass matrix: calcium fluoride ensures high transparency and chemical stability, magnesium fluoride improves ultraviolet transmittance and mechanical strength, barium fluoride optimizes melting fluidity and rare earth doping uniformity;Add aluminum fluoride to inhibit crystallization and enhance uniformity, rare earth elements realize optical function regulation, ammonium fluoride provides fluorine source and reduces impurities;In the preparation link, after dust removal, quicklime is reacted with pure water in proportion, calcium nitrate solution is removed with hydrogen peroxide, ammonia water and carbon dioxide control the uniform growth of calcium carbonate crystal nucleus, after plate and frame pressure filtration purification, calcium fluoride is synthesized with hydrofluoric acid in proportion and low temperature drying;After ball milling and refining raw materials, the melting temperature is controlled in stages, and the overall process precisely controls impurities, reaction completeness and microstructure, and finally a high transparency functional glass is obtained.

A laser diode module includes a substrate made from a metal having a coefficient of thermal expansion within a range of 10 - 25 ×10-6 / °K, an optical component made from a fluorinated glass with a coefficient of thermal expansion within a range of 12- 18 ×10-6 / °K, and a first adhesive disposed between the substrate and the optical component to bond the optical component to the substrate.

To provide an optical waveguide device in the field of mid-infrared photonics and a method for manufacturing such a device.SOLUTION: The device comprises a fluoride glass substrate having a local concentration of a chemical element at an internal contact and a waveguide inscribed along a path defined in the substrate. The waveguide is formed by directing a focused ultra-short laser pulse into the substrate and scanning the pulse to induce migration and densification of chemical elements at the inner contacts, resulting in a positive refractive index contrast. Fluoride glass substrates can include zirconium fluoride and modifiers such as barium fluoride, aluminum fluoride, and rare earth elements to enable optical gain. The described technology further encompasses an integrated photonics device including a waveguide laser with mirrors and gratings defining a laser cavity for use in sensing, communications, and laser systems.SELECTED DRAWING: Figure 1

The invention discloses thulium-doped calcium aluminate glass as well as a preparation method and application thereof, and the thulium-doped calcium aluminate glass comprises the following chemical components in percentage by mole: 15-30% of Al2O3; 0% to 15% of Ga2O3; caO: 55%-60%; znO: 0%-5%; 5% to 10% of BaF2; 0%-5% of Na2O; 0%-1% of Sb2O3; and 0.1%-1% of Tm2O3. The thulium-doped calcium aluminate glass is used for preparing a gain optical fiber of an S-band optical fiber amplifier. On the basis of high thermal stability, the thulium-doped calcium aluminate glass can obtain strong fluorescence emission in the wave band of 1.47 microns, the full width at half maximum of the spectrum of the thulium-doped calcium aluminate glass is 147 nm, the thulium-doped calcium aluminate glass is superior to thulium-doped fluoride glass and tellurate glass reported in the current literature, and the thulium-doped calcium aluminate glass is expected to be used for realizing an ultra-wideband S-wave band optical fiber amplifier.

The present disclosure relates to an optical waveguide device and a method for fabricating such a device in the field of mid-infrared photonics. The device comprises a fluoride glass substrate having localized concentrations of a chemical element at inscription points, with a waveguide inscribed along a defined path within the substrate. The waveguide is formed by directing focused ultrashort laser pulses into the substrate and scanning the pulses to induce migration and densification of the chemical element at the inscription points, resulting in a positive refractive index contrast. The fluoride glass substrate may include zirconium fluoride and modifiers such as barium fluoride, aluminium fluoride, and rare-earth elements to enable optical gain. The described technology further encompasses integrated photonic devices, including waveguide lasers comprising mirrors and gratings that define a lasing cavity for use in sensing, communication, and laser systems.