98 results about "Holmium" patented technology

The invention provides a holmium and ytterbium co-doped mid-infrared microsphere Raman laser and a preparation method thereof, and relates to the technical field of laser preparation, the holmium and ytterbium co-doped mid-infrared microsphere Raman laser comprises an infrared transmission optical fiber, a pump light source, holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres, pump light emitted by the pump light source is guided to a conical region through the infrared transmission optical fiber, and the holmium and ytterbium co-doped tellurate glass microspheres and the passive tellurate glass microspheres are arranged in the conical region; sequentially carrying out optical coupling with holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres; in the holmium and ytterbium co-doped tellurate glass microspheres, the doping amount of the holmium element is 0.3%, and the doping amount of the ytterbium element is 0.45% according to the mass percentage. Compared with the prior art, through the cascade structure of the holmium-ytterbium co-doped microspheres and the passive microspheres, three-step wavelength conversion of pump light-rare earth ion lasing-Raman frequency shift is realized in a single system for the first time, and the wavelength limitation that a traditional single microsphere depends on a rare earth ion fixed energy level is broken through.

The invention discloses a gas-sensitive material based on double noble metal doped holmium iron oxide and application of the gas-sensitive material to detection of hydrogen sulfide in a sulfur-containing ore body exploration environment, and relates to the technical field of gas-sensitive materials. HoFeO3 is used as a substrate material, and two elements of Au and Pt are used for doping modification of the HoFeO3 to prepare the gas sensitive material based on double noble metal doped holmium iron oxide. Au and Pt are combined to perform doping modification on HoFeO3, a synergistic effect is achieved on improving the temperature stability of the gas-sensitive material, the sensitivity of the gas-sensitive material in a high-humidity environment can be improved, in addition, due to the synergistic catalysis effect of Au and Pt, an energy barrier of H2S adsorption reaction can be remarkably reduced, surface electron transfer and reaction activity are promoted, and the sensitivity of the gas-sensitive material in a high-humidity environment is improved. Therefore, the working temperature is reduced, the response value is improved, and the method is suitable for detecting hydrogen sulfide gas in a sulfur ore body exploration environment.

The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.

The invention discloses a dual-wavelength microsphere laser based on tri-doped rare earth ions and a preparation method thereof, the dual-wavelength microsphere laser based on tri-doped rare earth ions comprises a silica fiber, the middle part of the silica fiber is provided with a conical region; the pump light source is arranged at one end of the silica fiber; the erbium, holmium and ytterbium tri-doped tellurate glass microspheres are arranged in the conical region; pump light emitted by the pump light source is guided to the conical region through the single-mode optical fiber and is optically coupled with the erbium-holmium-ytterbium tri-doped tellurate glass microsphere; in the erbium-holmium-ytterbium triple-doped tellurate glass microspheres, infrared-transmitting tellurate glass is used as a matrix, and the doping amount of an erbium element is 0.11%, the doping amount of a holmium element is 0.22%, and the doping amount of an ytterbium element is 0.80% in percentage by mass. According to the dual-wavelength microsphere laser based on the three-doped rare earth ions, efficient and stable dual-wavelength laser output is achieved.

The invention discloses a cascade up-conversion-based photosensitive material and a preparation method thereof. The cascade up-conversion-based photosensitive material comprises a photopolymerization material, holmium-ytterbium rare earth nanoparticles and a triplet-state up-conversion material, the photopolymerization material comprises a photoinitiator and a polymerization monomer; the triplet-state up-conversion material comprises a sensitizer and an annihilation agent; the polymeric monomer adopts a liquid monomer or oligomer containing more than 3 active groups. Through the synergistic effect of the photopolymerization material, the holmium-ytterbium rare earth nanoparticles and the triplet state up-conversion material, a brand new cascade up-conversion mode is formed, the dispersivity of up-conversion photopolymerization of traditional thulium-ytterbium nanoparticles is overcome, and low-power, low-cost and high-precision continuous laser micro-nano structure processing is realized.

The invention discloses a method for determining the content of trace holmium, thulium and tungsten in rare earth erbium and a compound thereof, which comprises the following steps: placing a rare earth erbium and compound sample thereof in a beaker, and performing a blank test along with a sample; adding nitric acid, heating at low temperature until the sample is completely dissolved, and cooling; transferring into a volumetric flask, adding a cesium internal standard solution, diluting with water, and uniformly mixing; the holmium, the thulium and the tungsten are measured by using an oxygen mode of an inductively coupled plasma tandem mass spectrometer, and the contents of the holmium, the thulium and the tungsten are calculated according to a working curve method. According to the method, the inductively coupled plasma tandem mass spectrometry technology is used, and mass spectrum interference of an erbium matrix on holmium, thulium and tungsten is effectively eliminated by selecting a proper reaction mode and optimizing the flow of reaction gas.

The invention discloses a magnetic multilayer film device based on spin orbit torque and a preparation method, and relates to the technical field of spintronics, and the device is composed of a Hall bar composed of a magnetic multilayer film and a Ti / Au composite electrode. Wherein the magnetic multilayer film is composed of a buffer layer, a heavy metal layer, a ferromagnetic layer and an oxide covering layer. In the invention, the buffer layer is tantalum; the heavy metal layer is platinum-holmium alloy; the ferromagnetic layer is cobalt iron boron; and the covering layer is magnesium oxide. According to the invention, the spin Hall angle of the SOT device is improved, and the energy consumption of the device is reduced. When a device is subjected to in-situ annealing, a sample table with an adjustable angle is used for constructing a temperature gradient to realize SOT-based magnetization overturning without in-plane field assistance, and a brand new technical route is provided for subsequent research and development of SOT-MRAM.

The invention relates to the technical field of synthesis and processing of ceramic materials, and discloses a multiphase composite coated high-dielectric-constant ceramic material and a preparation method of the multiphase composite coated high-dielectric-constant ceramic material. 11%-13% of strontium titanate; 5%-7% of holmium oxide; 5%-6% of lead magnesium niobate; 6%-7% of titanium dioxide; 2%-3% of yttrium oxide; 3%-4% of magnesium oxide; 3%-4% of bismuth oxide; 2%-3% of lithium carbonate; 4%-5.5% of silicon dioxide; 1%-2% of zinc oxide; 2.5%-3.5% of manganese dioxide; 6%-7% of copper oxide; 3%-4% of glass powder; 0.05% to 0.08% of lanthanide series elements; through the steps of component pretreatment, ball milling and mixing, drying and sieving, forming, sintering and post-treatment, the component activity is improved through high-temperature calcination pretreatment, and directional growth of crystal grains in the components can be promoted by precisely controlled sintering temperature; the prepared ceramic material has the advantages of high dielectric constant, low dielectric loss, excellent densification effect and good mechanical property.

The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a multi-component rare earth alloy diffusion source for improving the coercive force of a high-abundance neodymium-cerium-iron-boron magnet. The invention discloses a multi-component rare earth alloy diffusion source for improving the coercive force of a high-abundance neodymium-cerium-iron-boron magnet. The multi-component rare earth alloy diffusion source comprises rare earth elements and non-rare earth elements, the rare earth element is one or two of praseodymium element and holmium element; the non-rare earth element is a combination of an aluminum element and a copper element; the mass percent of rare earth elements in the multi-component rare earth alloy diffusion source is 80-95%, and the mass percent of non-rare earth elements in the multi-component rare earth alloy diffusion source is 5-20%. The invention further discloses a method for improving the coercive force of the high-abundance neodymium-cerium-iron-boron magnet and the prepared high-performance high-abundance neodymium-cerium-iron-boron magnet. The low-cost heavy rare earth element Ho is adopted as a diffusion source component, a Ho-rich (RE, Ho) 2Fe14B phase with a high magnetocrystalline anisotropy field is formed on the surface layer of main phase crystal grains, and the coercive force of the high-abundance neodymium-cerium-iron-boron magnet is improved.

The present invention relates to the field of nanomaterial synthesis, and discloses an upconversion luminescent material, a preparation method thereof, and an application thereof. The preparation method of the upconversion luminescent material comprises: (1) first stirring an ytterbium salt solution, an ammonium molybdate tetrahydrate solution, and a rare earth metal salt solution to obtain an intermediate I; the rare earth metal salt in the rare earth metal salt solution is selected from at least one of an erbium salt, a holmium salt, a praseodymium salt, and a europium salt; (2) subjecting the intermediate I to a hydrothermal reaction in a hydrothermal reactor to obtain an intermediate II; and (3) sequentially subjecting the intermediate II to a drying treatment and a calcination treatment to obtain the upconversion luminescent material. The upconversion luminescent material particles prepared by the method of the present invention have an average particle size of nanometer level, a good degree of crystallinity, and good reverse thermal quenching performance.

This invention belongs to the field of surface modification technology for metallic materials, and discloses a steel-based laser cladding gradient transition layer and its application. The steel-based laser cladding gradient transition layer utilizes rare-earth holmium (Ho) and in-situ TiC nanoparticles for synergistic reinforcement, resulting in a uniform and dense TiC microstructure and significantly improved high-temperature stability. The gradient composite coating employs a three-layer gradient structure—a base layer, a transition layer, and a working layer—to achieve a smooth transition in hardness and high-temperature performance, eliminating interfacial thermal stress concentration and significantly improving interlayer bonding strength and anti-stripping ability. This invention employs a layered laser cladding process to achieve a smooth transition in coating hardness and performance, effectively eliminating interfacial thermal stress concentration and improving coating bonding strength and high-temperature stability. This invention is the first to use Ho in laser cladding gradient coatings, resulting in outstanding grain refinement and grain boundary purification effects, significantly improving coating microstructure uniformity, high-temperature strength, and thermal fatigue resistance. The process is stable and reliable, suitable for industrial strengthening applications in large aluminum alloy die-cast cups.

The present invention relates to the field of magnetic functional materials. The present invention discloses a use of a rare earth fluoride single crystal in magnetic refrigeration, a magnetic refrigeration method and a magnetic refrigeration device. A magnetocaloric material of the series is lithium rare earth fluoride, with the chemical formula of LiREF4, wherein RE is one or more of rare earth elements gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium. A magnetocaloric material single crystal of the series has extremely strong magnetic anisotropy. By applying a varying magnetic field of 0-20 kOe along the easy magnetization axis direction of the magnetocaloric material, LiGdF4, LiTbF4, LiHoF4, LiDyF4, LiErF4, LiYbF4 and LiTmF4 obtained isothermal magnetic entropy changes of 50.35 J·kg−1·K−1, 21.12 J·kg−1·K−1, 24.98 J·kg−1·K−1, 24.45 J·kg−1·K−1, 21.95 J·kg−1·K−1, 14.7 J·kg−1·K−1 and 0.692 J·kg−1·K−1, respectively, at 1.8K, 4K, 4K, 1.8K, 1.8K, 1.8K, and 18K. Wherein, the thermal conductivity of LiTbF4 and LiErF4 reaches 50 W·K−1·m−1 at 25K.

The invention discloses a modification method of a ternary positive electrode material. The modification method comprises the following steps: S1, carrying out a co-precipitation reaction on a solution of transition metal sulfate in an inert gas atmosphere; a sulfate solution of rare earth elements is synchronously added in the coprecipitation process, and a ternary precursor with the surface coated with rare earth hydroxide is formed; and S2, mixing the ternary precursor obtained in the step S1 with a lithium source, calcining in an air atmosphere, and cooling to obtain the fast ion conductor coated ternary positive electrode material, the rare earth elements are selected from one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; the transition metal sulfate is soluble salt of Ni, Co and Mn. The rare earth element sulfate is added in the coprecipitation process, the rare earth element hydroxide is precipitated on the surface of the precursor, the lithium source is removed after filtering and drying, uniform mixing is performed, and the ternary positive electrode material which contains the rare earth element and is uniformly coated with the fast ion conductor is obtained after calcination, so that side reactions on the surface of the material are reduced; and the cycling stability of the positive electrode material is improved.

Aspects are provided for a UV-Vis calibration solution, composed of a lanthanide and an ionic liquid. In particular, the UV-Vis calibration solution may contain 4 to 12% by weight of Holmium (III), dissolved in an aqueous chloride solution. The disclosure also includes a calibration standard created from this calibrated solution, by placing the solution in a cuvette and capping it. The disclosure additionally includes a method of using the calibration standard to obtain a UV-Vis spectrum in the wavelength range of about 250 nm to 700 nm.

The application belongs to the technical field of laser materials, and relates to a holmium-praseodymium-scandium doped composite calcium fluoride single crystal as well as a preparation method and application thereof. 0.01 Pr x Sc y Ca 0.99‑x‑y F 2.01+x+y , wherein 0.005 <= x <= 0.015, 0.005 <= y <= 0.05; the crystal is obtained by growing the crystal in a vacuum environment through a temperature gradient method. Compared with the prior art, the application can realize high-efficiency laser output in a 2-3 mu m mid-infrared wave band, the grown crystal has the characteristics of high thermal conductivity, high chemical stability, high transmittance and high quality, and has the advantages of high gain bandwidth, high gain cross section, high power and high slope efficiency in the mid-infrared wave band, and has significant advantages in the fields of environmental monitoring, industrial processing, national defense and safety.

The application relates to the technical field of target production, and discloses a low-resistance and high-mobility indium oxide doped target material, wherein metal elements in the target material are composed of indium, titanium, holmium and cerium; the molar ratio of the indium, titanium, holmium and cerium is 92.4-95.2:3-4:0.7-0.9:1.5-1.8; the target material is prepared through a degreasing operation and an oxygen-rich sintering operation of a target precursor containing indium oxide powder, titanium oxide powder, holmium oxide powder and cerium oxide powder; the process parameters of the degreasing operation are as follows: a degreasing temperature is 500-600 DEG C, and an oxygen pressure is 0.02-0.05 MPa; and the process parameters of the oxygen-rich sintering operation are as follows: a sintering temperature is 1300-1550 DEG C, and an oxygen pressure is 0.09-0.12 MPa.

The application relates to the technical field of target production, and discloses a preparation method of high-purity indium cerium tantalum holmium oxide target material, which comprises the following steps: step 1: soluble metal salts of indium, cerium, tantalum and holmium are weighed according to a molar ratio of In:Ce:Ta:Ho=90-94:0.8-1.2:4-6:1.2-2.8, and are dissolved in deionized water; step 2: a precipitant urea is added to the mixture in step 1 and is mixed; step 3: the mixture in step 2 is placed in a sealed container and is heated at 190-200 DEG C, and after heating is completed, a precursor powder is separated; and step 4: the precursor powder is calcined and shaped to obtain the indium cerium tantalum holmium oxide target material. The content of indium in the target material is relatively low, the use of cerium, tantalum and holmium is beneficial to control of high conductivity, and the purity of the target material can be effectively maintained through a wet precipitation process, which is also an important factor for improvement of the conductivity. In addition, the application also discloses the target material.

The invention relates to a novel functional material for X-ray protection, in particular to a liquid metal flexible shielding material and a preparation method and application thereof. The material comprises liquid metal and solid metal, the liquid metal serves as a solvent to be filled in gaps of the solid metal, the liquid metal is gallium, gallium indium, gallium indium tin, gallium indium tin zinc or mercury, and the solid metal is selected from one or more of indium, tin, gold, platinum, iridium, zirconium, niobium, molybdenum, ruthenium, osmium, rhenium, rhodium, tungsten, antimony, palladium, tantalum, hafnium, lutetium, lead, ytterbium, thulium, bismuth, silver, erbium, holmium, dysprosium, terbium, gadolinium, samarium, neodymium, lanthanum, praseodymium, cerium and europium. On the basis of compounding of the liquid metal solvent and the solid metal solute based on the liquid metal combinatology, the liquid metal and the solid metal are jointly used for protecting X-ray radiation, the comprehensive performance of X-ray protection is improved, and meanwhile the variety and number range of selectable metal elements is widened.

The application provides a high-thermal-conductivity radiation refrigeration coating for a 5G communication base station cabinet and a preparation method thereof, and belongs to the technical field of coatings. A SiC@BN / TiB2 three-phase fiber framework obtained through three-stage calcination is bonded with methylphenyl silicone resin through a silane coupling agent to form a longitudinal high-speed thermal conduction framework. Starburst calcium titanate and edge in-situ magnesium fluoride form a refractive index ladder and a rough multi-faceted structure, which not only reflects ultraviolet-near infrared light, but also endows weather resistance. Holmium / ytterbium co-doped calcium fluoride nanosheets are transversely overlapped to scatter near infrared light and convert the near infrared light into medium-far infrared radiation which can penetrate the atmospheric window, thereby further dissipating heat. Through mutual cooperation of a longitudinal continuous heat conduction path, a transverse heat dissipation network, optical multiple scattering and energy downshift radiation, stable chemical bond network support is achieved to realize high-efficiency, long-term reliable heat dissipation performance.

The present application relates to the technical field of optical fibers, in particular to a dual-wavelength femtosecond fiber laser. The laser comprises a pumping light source, which is used for outputting first-wavelength femtosecond pulse laser and a first excitation light source; a double-clad nonlinear optical fiber, which is connected to an output end of the pumping light source and is used for converting part of the first-wavelength femtosecond pulse laser into second-wavelength femtosecond pulse laser by means of using the soliton self-frequency shift effect, and outputting the remaining first-wavelength femtosecond pulse laser, the second-wavelength femtosecond pulse laser and the first excitation light source; and a holmium-doped gain fiber, which is connected to the output end of the double-clad nonlinear optical fiber and is used for amplifying the first-wavelength femtosecond pulse laser and the second-wavelength femtosecond pulse laser under the excitation of the first excitation light source. Therefore, the present application achieves the output of dual-wavelength high-energy femtosecond pulse laser in full-fiber mid-infrared lasers, achieves a compact and portable structure, good environmental adaptability and wavelength and energy advantages in practical applications such as medicine and material processing, and is applicable to vehicle-mounted scenarios, airborne scenarios, etc.

The invention discloses an intracavity resonance ESA pumping enhanced thulium-doped laser, which comprises a 0.8 [mu] m pumping source, an input mirror, a thulium-doped laser medium, a holmium-doped laser medium and an output mirror, the thulium-doped laser medium and the holmium-doped laser medium are placed in the same cavity, 1.9 [mu] m, 2.1 [mu] m and 2.3 [mu] m laser resonant cavities are formed between the input mirror and the output mirror, the 0.8 [mu] m pumping source emits 0.8 [mu] m wave band pumping light, and the output mirror emits holmium-doped laser light. The laser is emitted to the thulium-doped laser medium through the input mirror, the generated 1.9 [mu] m and 2.1 [mu] m wave band laser oscillates in the cavity but is not output to the outside of the laser resonant cavity, and the generated 2.3 [mu] m laser is output to the outside of the laser resonant cavity through the output mirror. The thulium-doped laser is based on 2.1 [mu] m intra-cavity resonance ESA pumping enhancement, and the thulium-doped laser intra-cavity pumping holmium-doped laser is utilized to realize enhancement of thulium-doped laser medium 2.3 [mu] m wave band laser radiation by regulating and controlling the number of 3H5 energy level particles.

The invention provides a high-density corrosion-resistant metal ceramic inert anode and a preparation method thereof. During preparation, rare earth metal holmium, zinc oxide, nickel oxide, chromic oxide and copper powder are selected as raw materials, the zinc oxide, the nickel oxide, the chromic oxide and the copper powder are subjected to ball milling for 12 h and screened, the copper powder is heated and subjected to heat preservation for 2 h at the temperature of 450 DEG C in the hydrogen atmosphere, and then all the raw materials are put into a three-dimensional mixer to be mixed for 10 h; and carrying out vacuum drying, pressing a green body under the pressure of 50-60MPa, putting the green body into thermal shock sintering equipment, carrying out thermal shock sintering at 1100 DEG C for 5-10s, and cooling and curing at the speed of 20 + / -5 DEG C / min to obtain the metal ceramic inert anode. According to the preparation method, the metal copper and the metal oxide powder serve as main raw materials, the production cost is low, the prepared metal ceramic anode has high conductivity and corrosion resistance, emission of greenhouse gas can be effectively reduced, and green and sustainable development of aluminum electrolysis is achieved.

Provided is an aluminum alloy powder comprising 0.1-2.0 mass% or one or more metal elements from among rare earth metal elements comprising the lanthanide elements and yttrium, wherein the iron content is suppressed to not more than 2.0 mass%. The rare earth metal element is preferably one of praseodymium, neodymium, europium, samarium, terbium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

The present invention discloses a HoMOF material, its preparation method and its application, which comprises: (1) mixing a holmium source, organic ligand and solvent, sonicating to obtain the first mixture; (2) Placing the first mixture in the condensation reflux device for heating and stirring to obtain the second mixture; (3) Post treating the second mixture to obtain HoMOF material. Therefore, the preparation method is facile, and the obtained HoMOF material has a uniform pore structure, fewer impurity peaks, a single structure, good crystal structure and good magnetism, which can be further applied to adsorb methylene blue from waste water.

A laser apparatus for generating a sub- 190 nanometer laser beam includes a deep-ultraviolet solid-state laser source to generate an initial deep-ultraviolet laser beam, at least one mid-infrared solid-state laser source to generate at least one respective mid-infrared laser beam, and at least one lithium triborate crystal to generate an output deep-ultraviolet laser beam from the initial deep-ultraviolet and mid-infrared laser beams via sum-frequency generation. Each mid-infrared solid- state laser source includes (a) a holmium-, thulium-, or chromium-doped gain crystal or gain fiber or (b) an optically-pumped semiconductor gain material to generate the respective mid-infrared laser beam. The laser apparatus may be configured for continuous-wave and pulsed operation, thus offering versatile solutions for applications requiring DUV laser radiation below 190 nanometers. Advantageously, the present approach relies on lithium triborate. Lithium triborate crystals can be grown with the quality and dimensions needed for industrial applications.

The application relates to the technical field of nanometer materials, and particularly discloses a bismuth titanate nanometer material, a preparation method thereof and a sewage treatment method. The preparation method of the bismuth titanate nanometer material comprises the following steps: uniformly mixing bismuth oxide, titanium oxide, holmium oxide, sodium chloride and potassium chloride according to a molar ratio of Bi:Ti:Ho:NaCl:KCl=(3.5-3.92):(2.8-3.2):(0.1-0.5):(40-55):(40-55) to obtain a precursor; calcining the precursor to obtain an intermediate product; and removing sodium chloride and potassium chloride in the intermediate product. By implementing the application, the polarity and piezoelectric response of the bismuth titanate nanometer material can be improved, and the piezoelectric-optical catalytic performance of the bismuth titanate nanometer material can be improved.

This invention discloses a holmium ion-doped yttrium gadolinium oxide single-crystal optical fiber, its preparation method, and its applications, belonging to the field of laser materials and laser technology. The chemical formula of the single-crystal optical fiber is Ho. 3+ YGdO3, wherein the Ho ion doping concentration is 0.2-1.0 at.%, is a cubic C-type sesquioxide crystal structure with space group Ia-3. This crystal exhibits characteristic absorption peaks at wavelengths of 1100-1200 nm and Ho-derived absorption peaks at 2.80-2.90 μm. 3+ ion 5 I6→ 5 Broad-spectrum mid-infrared fluorescence emission with I7 level transition; this crystal possesses a wide gain bandwidth, a large emission cross section, and excellent thermal properties, making it less prone to thermal lensing and thermal depolarization under continuous or high-repetition-rate pumping of single-crystal fibers, thus ensuring high stability of laser output. It is particularly suitable for realizing broadband tunable and ultrafast mode-locked mid-infrared lasers, and has broad application prospects in laser surgery, environmental monitoring, remote sensing, and other fields.

The invention relates to a rare earth oxide high-temperature thermistor material suitable for temperature measurement and control of an aero-engine and a preparation method thereof, the thermistor takes holmium oxide, erbium trioxide, thulium trioxide, ytterbium trioxide, lutetium trioxide and tantalum pentoxide as raw materials, the chemical composition is RETaO4, Ln = Ho, Er, Tm, Yb, Rm = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17 The material constant B value range is 10565-15673 K, the resistivity is 2.20 * 10 < 5 >-1.295 * 10 < 6 > omega.cm at the temperature of 500 DEG C, the linear determination coefficient R2 of ln rho and 1000 / T is greater than 99%, the resistance drift rate is between 3.01% and 60%, and the absolute value of the resistance drift rate of (HoErTmYbLu) 1 / 5TaO4 after aging for 50 hours at the temperature of 1500 DEG C is less than 3.01%. The high-temperature thermistor prepared by the preparation method is stable in resistance performance and good in consistency, has an excellent negative temperature coefficient thermosensitive characteristic in a wide temperature range of 400-1500 DEG C, and is suitable for manufacturing a high-performance high-temperature thermistor suitable for temperature measurement and control of an aero-engine.

Method for producing a sensor comprising a layer system (100) for the upconversion of near-infrared and / or visible radiation, the method comprising: - forming a, preferably two-dimensional, photonic crystal (110) having a first (111) and a second side (112) by means of nanoimprint lithography; - applying an upconversion material (120) to the first side (111) and / or the second side (112) of the photonic crystal (110), wherein the upconversion material (120) contains a first lanthanide, wherein the first lanthanide is preferably neodymium or ytterbium; and wherein the upconversion material (120) contains a second lanthanide, wherein the second lanthanide is preferably selected from the group consisting of erbium, thulium and holmium.

The invention discloses a screening method and device for holmium-copper alloy spherical particles applied to quantum computing, and relates to the classified screening technology, the device comprises four stages of screening devices, the first screening device and the second screening device screen the holmium-copper alloy spherical particles according to the size by setting the upper limit and the lower limit of the specification, then impurities are removed through slope screening, and the holmium-copper alloy spherical particles are obtained. And finally, irregular particles are removed through bouncing separation of the separation balls, and finally the holmium-copper alloy spherical particles meeting the requirements are obtained. According to the method, screening of the holmium-copper alloy spherical particles is achieved through five steps. The holmium-copper alloy spherical particle screening device can rapidly and efficiently screen out holmium-copper alloy spherical particles with the size meeting the requirement and the intact spherical shape, impurities in the holmium-copper alloy spherical particles are removed, and the requirements of scientific research and production are met.