32 results about "Holmium" patented technology

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.

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 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.

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.

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 present invention relates to an optical amplifier (1) for a fiber laser source (3) for generating laser radiation in the infrared range, in particular over a bandwidth of 2.0-2.2 µm, comprising a preamplifier which is applied to an optical input signal S IN with an input signal wavelength λ IN and a first pump jet with a pump wavelength λ p1 reacts and an amplified input signal S IN2 outputs, and a thulium, thulium:holmium or holmium-doped power amplifier coupled to an output of the preamplifier, which reacts to the amplified input signal S IN2 and a second pump jet with a pump wavelength λ p2 reacts and produces an amplified output signal S OUT outputs, with the preamplifier being Thulium:Holmium-codoped.

A core-shell nanoparticle having a cleaned nitrogen-vacancy nanodiamond (NVND) core surrounded by an upconversion nanoparticle (UCNP) shell, wherein the cleaned nitrogen-vacancy nanodiamond (NVND) core comprises a cleaned nitrogen-vacancy nanodiamond, wherein the UCNP shell comprises an upconversion nanoparticle (UCNP), wherein the UCNP comprises lithium yttrium fluoride (LiYF4) doped with a lanthanide ion combination, wherein the lanthanide ion combination comprises a M1 ion and a M2 ion, wherein M1 is ytterbium (Yb) or neodymium (Nd) and M2 is erbium (Er), thulium (Tm) or holmium (Ho), and wherein the core-shell nanoparticle emits a red-emission upon a near-infrared (NIR) excitation is disclosed. Integration of cleaned NVNDs with UNCPs for enhancing optical manipulation and enabling efficient energy transfer for applications in biological imaging, quantum sensing and laser cooling is disclosed.

The application discloses a kind of based on three doped rare earth ions Dual-wavelength microsphere laser and preparation method thereof, the Dual-wavelength microsphere laser based on three doped rare earth ions includes, quartz optical fiber, the middle part of the quartz optical fiber is provided with taper area;Pump light source, it is set in one end of the quartz optical fiber;Erbium-holmium-ytterbium three-doped tellurite glass microsphere, place in the taper area;Pump light emitted by the pump light source is guided to the taper area by the single-mode optical fiber, and carries out optical coupling with the erbium-holmium-ytterbium three-doped tellurite glass microsphere;In the erbium-holmium-ytterbium three-doped tellurite glass microsphere, with infrared-transmitting tellurite glass as matrix, according to mass percentage content, erbium element doping amount is 0.11%, holmium element doping amount is 0.22%, and ytterbium element doping amount is 0.80%.The Dual-wavelength microsphere laser based on three doped rare earth ions of the application realizes high-efficiency stable dual-wavelength laser output.

This invention belongs to the field of rare-earth luminescent materials and optical sensing technology, specifically disclosing an upconversion temperature probe excited by NIR-I, its preparation method, and its application. The probe includes a matrix core material, which is a fluoride crystal; and dopant ions, specifically holmium ions (Ho) doped into the matrix core material. 3+ Ho 3+ As the sole luminescent center, it is excited by a near-infrared I light source with a wavelength of 880-920 nm to generate Ho. 3+ Characteristic green upconversion luminescence and red upconversion luminescence. This invention employs the aforementioned NIR-I excited upconversion temperature probe, its preparation method, and its application, utilizing Ho... 3+ The unique energy level competition mechanism of ions enables high-sensitivity temperature measurement over a wide temperature range, and the temperature measurement signal is unaffected by fluctuations in excitation power.

According to the ultra-wideband ASE light source based on the optical fiber splicing structure, the pump light is coupled into the thulium-doped optical fiber through the pump module, and amplified spontaneous emission light generated after the thulium-doped optical fiber absorbs the pump light can effectively excite holmium ions in the holmium-doped optical fiber, so that the spectral bandwidth range of the amplified spontaneous emission light is effectively widened; meanwhile, by physically splicing the thulium-doped optical fiber and the holmium-doped optical fiber, the ultra-wideband ASE light source can fundamentally solve the problem of up-conversion loss of energy transfer of thulium ions and holmium ions, and finally, the output power of the ultra-wideband ASE light source is effectively improved.

The present invention relates to an optical amplifier (1) for a fiber laser source (3) for generating laser radiation in the infrared range, in particular over a bandwidth of 2.0-2.2 μm, comprising a preamplifier, which reacts to an optical input signal (SIN) having an input signal wavelength (λIN) and a first pump beam having a pump wavelength (λp1) and outputs an amplified input signal (SIN2), and a thulium-, thulium:holmium- or holmium-doped power amplifier, which is coupled to an output of the preamplifier and reacts to the amplified input signal (SIN2) and a second pump beam having a pump wavelength (λp2) and outputs an amplified output signal (SOUT), wherein the preamplifier is thulium:holmium-codoped.

A single-mode excitation color-changing luminescent upconversion material, and its preparation method are provided. The molecular formula of the single-mode excitation color-changing luminescent upconversion material is AxMOCly-1:Yb / Ln, where A is at least one of Lithium(I) ion (Li+), Sodium(I) ion (Na+), Sodium(I) ion (K+), or Cesium(I) ion (Cs+); M is at least one of Lanthanum(III) ion (La3+), Yttrium(III) ion (Y3+), Gadolinium(III) ion (Gd3+), or Lutetium(III) ion (Lu3+); Ln is at least one of Erbium(III) ion (Er3+), Holmium(III) ion (Ho3+), or Holmium(III) ion (Tm3+), with 1≤x≤4 and 4≤y≤7. The excitation wavelength range of the material is 950 nanometers (nm)-1100 nm, and the emission wavelength range is 400 nm-800 nm. Under single-mode near-infrared excitation, the material exhibits color-changing upconversion luminescence.

The application relates to a screening method and device of holmium-copper alloy spherical particles applied to quantum computing, and relates to grading and screening technology.The device of the application comprises four-stage screening devices, the first and second screening devices screen the size of holmium-copper alloy spherical particles by setting the upper limit and lower limit of the specification, then remove impurities through inclined surface screening, and finally remove irregular particles through the bounce separation of separated balls, so that holmium-copper alloy spherical particles meeting the requirements are obtained; the method of the application realizes the screening of holmium-copper alloy spherical particles through five steps. The application can quickly and efficiently screen out holmium-copper alloy spherical particles meeting the size requirements and having perfect spherical shapes, remove impurity components in the holmium-copper alloy spherical particles, and meet the needs of scientific research and production.

A cold storage material particle according to one embodiment comprises: at least one first element selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu); nickel (Ni); at least one second element selected from the group consisting of silicon (Si) and germanium (Ge); a crystal phase of a SmNiGe3 type; and at least one of a CeNiSi2 type crystal phase and a CaF2 type crystal phase.

The invention provides a high-energy thulium pump holmium laser oscillation amplifier, and belongs to the technical field of solid lasers, and the high-energy thulium pump holmium laser oscillation amplifier comprises a pumping source which comprises a thulium-doped yttrium aluminum garnet crystal and is used for outputting pumping laser of a first wavelength; the oscillator comprises a holmium-doped yttrium aluminum garnet crystal and is used for generating seed laser with a second wavelength by taking the pump laser as pump light; the amplifier comprises a holmium-doped yttrium aluminum garnet crystal and is used for amplifying the seed laser by taking the pump laser as pump light; wherein the first wavelength is not located on an absorption main peak of the holmium-doped yttrium aluminum garnet crystal. According to the invention, high-energy narrow-pulse two-micron laser output is realized, and meanwhile, good thermal management performance and system stability are achieved.

The invention provides a luminescent material and a preparation method thereof, and relates to the field of materials. The general chemical formula of the luminescent material is Sr (1-x-y) Al2O4: Eu < 2 + > x, Ho < 3 + > y, M < + >, wherein M < + > is a charge compensation agent ion and is selected from one or more of Li < + >, Na < + > and K < + >. The preparation method of the luminescent material comprises the following steps: mixing strontium salt, aluminum salt, ethanol, water and a complexing agent to obtain a first solution; mixing the europium salt solution, the holmium salt solution and the charge compensation agent with the first solution to obtain a second solution; heating the second solution to obtain sol, then adjusting the pH value of the system to be acidic, and continuously heating to obtain gel; and drying and pre-sintering the gel, and sintering in a weak reducing atmosphere to obtain the luminescent material. The luminescent material provided by the invention has the advantages of long afterglow time, high luminance, good chemical stability and the like.

The application relates to the technical field of lasers, in particular to a mid-infrared distributed Bragg reflection single-frequency all-fiber laser and a preparation method thereof. The mid-infrared distributed Bragg reflection single-frequency all-fiber laser comprises a pump source, a quartz single-mode optical fiber and a holmium-praseodymium co-doped fluorine-zirconium-based glass gain optical fiber connected in sequence. The holmium-praseodymium co-doped fluorine-zirconium-based glass gain optical fiber comprises a high-reflection fiber Bragg grating, an intermediate part and a low-reflection fiber Bragg grating, the high-reflection fiber Bragg grating, the intermediate part and the low-reflection fiber Bragg grating constitute a resonant cavity, the gain spectral line full width at half maximum of the resonant cavity is greater than the adjacent longitudinal mode spacing of the resonant cavity, and the gain spectral line full width at half maximum of the resonant cavity is less than twice the longitudinal mode spacing of the resonant cavity. The application is at least beneficial to realizing a mid-infrared all-fiber single-frequency light source which is simple and compact in structure, stronger in anti-external disturbance capability and more stable in single-frequency output.

The present application relates to the technical field of rare earth material preparation, in particular to a preparation method of superfine holmium oxide nanomaterial. The present application adopts electrochemical deposition technology, deposits holmium precursor film on the electrode surface in holmium ion-containing electrolyte by regulating electrochemical parameters, and then converts the holmium precursor film into superfine holmium oxide nanoparticles through calcination treatment. The preparation method provided by the present application can avoid the complex reaction steps in traditional chemical synthesis, realize the preparation of nanoparticle holmium oxide with controllable particle size and uniform morphology, and the process is green and environmentally friendly, the equipment is simple and easy to operate, and is suitable for large-scale production.

The invention discloses a high-toughness holmium-doped silicon-containing niobium-based high-temperature material and a preparation method thereof, relates to a high-toughness holmium-doped silicon-containing niobium-based high-temperature material and a preparation method thereof, and aims to solve the problems that a niobium-based high-temperature material is low in strength and difficult to be well matched with toughness. The high-toughness holmium-doped silicon-containing niobium-based high-temperature material is composed of Nb, Si, Ho, Cr, Ti and W elements and is prepared through a vacuum non-consumable electric arc furnace, the obtained alloy has a strengthening phase Nb5Si3, and the strength of the alloy is remarkably improved; holmium doping obviously refines, the alloy structure is homogenized, and fine grain strengthening is achieved; a holmium oxide phase is formed, the oxygen content in a matrix is reduced, and the room-temperature toughness and strength are synchronously improved. The method is applied to the field of aerospace industry.

The invention relates to the technical field of new energy materials, in particular to a Ho-doped Mg3SbBi-based thermoelectric material and a preparation method and application thereof. The chemical formula of the Ho-doped Mg3SbBi-based thermoelectric material is Mg < 3.08-x > SbBiHox, wherein x is greater than or equal to 0 and less than or equal to 0.08. The invention also provides a preparation method of the Ho-doped Mg3SbBi-based thermoelectric material, which comprises the following steps: sealing solid elementary substances of magnesium, antimony, bismuth and holmium in a tantalum tube or a stainless steel crucible, and melting the solid elementary substances in vacuum to form a cast ingot; grinding the cast ingot to obtain alloy particles; and carrying out spark plasma sintering on the particles to obtain the Ho-doped Mg3SbBi-based thermoelectric material. The invention further provides application of the Ho-doped Mg3SbBi-based thermoelectric material as a heat energy and electric energy conversion material. According to the invention, the synthesis problem of low conductivity caused by near-room-temperature grain boundary scattering of the existing Mg3 (Sb, Bi) 2-based thermoelectric material is solved.

The application belongs to the technical field of rare earth permanent magnet materials, and particularly relates to a diffusion source, a preparation method of the diffusion source and a method for improving coercivity of a magnet. The diffusion source comprises lanthanum elements, heavy rare earth elements and non-rare earth elements; wherein the heavy rare earth elements are one or a combination of two or more of dysprosium elements, holmium elements, terbium elements and gadolinium elements; and the non-rare earth elements are one or a combination of two or more of aluminum elements, copper elements, cobalt elements and gallium elements. The diffusion source introduces La elements with stronger oxidizability, can promote Ce elements to enter a main phase, and reduce the influence of CeFe2 phase on diffusion of the heavy rare earth elements; meanwhile, due to the stronger oxidizability of the La elements than the heavy rare earth elements, the heavy rare earth oxides gathered in a grain boundary phase are reduced, the utilization rate of the heavy rare earth elements in the diffusion process is improved, the diffusion of the magnet is more uniform, the coercivity of the magnet is significantly improved, and the temperature coefficient of the magnet is improved.

The invention relates to the technical field of nano luminescent materials, in particular to a rare earth ion doped sodium yttrium fluoride nano material as well as a preparation method and application thereof. The doping amount of ytterbium can influence the intensity of red light emitted by the nanometer material under the excitation of 1208 nm near-infrared light, the doping amount of thulium can influence the intensity of green light emitted by the nanometer material under the excitation of 1208 nm near-infrared light, the doping amount of holmium can influence the intensity of blue light emitted by the nanometer material under the excitation of 1208 nm near-infrared light, and by adjusting the doping amounts of ytterbium, thulium and holmium, the doping amount of the ytterbium, the doping amount of thulium and the doping amount of holmium can be adjusted. Further, the chromaticity diagram (CIE) coordinate position of the nano material is (0.3012, 0.3158), belongs to a white light range, and can be used for a white light LED device. In addition, the molar ratio of the yttrium source, the ytterbium source, the thulium source and the holmium source influences the light emitting color of the nanometer material under excitation of near-infrared light of 980 nm and 1208 nm, and therefore the nanometer material can be used for optical anti-counterfeiting.

This invention belongs to the field of chemical power source electrode materials, and discloses a Mg-Dy-Ho anode material for magnesium-air batteries, its preparation method, and its application. The anode material is prepared from the following raw materials by mass percentage: 0.3-1.5% Mg-30%Dy master alloy, 0.3-1.5% Mg-30%Ho master alloy, with the balance being high-purity metallic magnesium. This invention uses high-purity magnesium as the matrix, and incorporates rare earth elements dysprosium and holmium to achieve microalloying, effectively balancing the activation and passivation contradictions of the magnesium anode. It also innovatively uses a sealed container instead of the crucible and mold in the conventional melting process, and performs ultrasonic treatment during melt solidification. This design significantly improves the uniformity of anode dissolution and corrosion resistance. Experiments have shown that the coexistence of Dy and Ho can synergistically reduce the corrosion current density, increase the discharge voltage plateau, and effectively suppress hydrogen evolution side reactions, increasing the anode utilization rate to 61.1%.

A 2μm band tunable single-frequency fiber laser, a ring cavity laser, includes a pump source, a wavelength division multiplexer, a thulium-holmium co-doped fiber, a mode field adapter, a composite sub-ring filter, a tunable fiber filter, an isolator, and a coupler. The pump source is a 1950nm band holmium ion co-band pump source, which pumps the thulium-holmium co-doped fiber. When the 1950nm band holmium ion co-band pump source pumps the thulium-holmium co-doped fiber, it forms a two-level system structure, which weakens the thulium ion cross-relaxation intensity while improving the energy conversion efficiency, thereby achieving suppression of self-pulses.

The invention discloses an isomorphic rare earth titanium oxide cluster material as well as a preparation method and application thereof. The general formula of the material is [Re2Ti4O4 (MAA) 14 (EtO) 2], and Re is a rare earth element including one of terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm) and ytterbium (Yb). The preparation method comprises the following steps: mixing corresponding rare earth metal acetate, titanium isopropylate, methacrylic acid and ethanol according to a ratio, carrying out ultrasonic dissolution, and carrying out standing reaction at 60 DEG C for 2 days to obtain a target product. The material has a single and definite molecular structure and a size less than 2 nanometers, can be dissolved in solvents such as propylene glycol methyl ether acetate, can form a film through spin coating, can be exposed by using electron beams or extreme ultraviolet light, and can form a clear pattern after development. The material has high extreme ultraviolet absorption cross sections of rare earth and titanium elements, the synthesis process is simple, the yield is high, a formed film layer is low in roughness, excellent resolution capability is shown in the scale range of 30-100 nm, and the material is suitable for high-performance photoresist in advanced semiconductor manufacturing.

The invention discloses thermal-quenching-resistant zero-dimensional inorganic rare-earth metal halide as well as a preparation method and application thereof, and belongs to the technical field of photoluminescent materials. And adding a holmium-containing compound into the aqueous solution of the cesium-containing compound, uniformly mixing, heating, and evaporating and crystallizing the solution to obtain the heat-quenching-resistant zero-dimensional inorganic rare-earth metal halide. The compound can be excited in a broadband mode in an ultraviolet-blue light area of 300-500 nm, the emission wavelength range is 600-1100 nm, the final luminous intensity is 60 times that of the compound under the room temperature condition within the temperature range of 303-543 K, and the unique heat quenching resistance behavior is shown. As the temperature rises, the compound is also subjected to phase change, and in the range of 353-573 K, the structure of the compound is subjected to phase change from Cs2HoCl5.H2O to Cs3HoCl6 and then to Cs2HoCl5 in sequence. Therefore, a thinking direction is provided for researching the phase change mode of the heat-quenching-resistant zero-dimensional inorganic rare earth metal halide in the temperature changing process. In addition, the preparation process flow of the compound is simple to operate, the synthesis time is short, and the compound has huge application potential and commercial value.

A holmium-doped laser (100) and a control method therefor. The laser (100) comprises a pump and seed source (101), a pump source amplifier (102), and a spatial resonant cavity (103); the pump and seed source (101) is configured for generating wavelength-tunable pump-seed light; the pump source amplifier (102) is configured for amplifying the pump-seed light to obtain amplified pump light; and the spatial resonant cavity (103) is configured for converting the amplified pump light into output laser light. By means of tuning the pump light wavelength, the holmium-doped laser (100) effectively achieves a 2-μm laser output with an optimal optical-to-optical conversion efficiency.

The invention relates to the technical field of photoluminescent materials and temperature detection, in particular to a holmium-based low-temperature ultra-sensitive up-conversion fluorescence nano temperature probe and a preparation method and application thereof.The nano temperature probe is a nano particle of a core-multilayer shell structure, and the structure is Ho < 3 + > luminescent core, an inert separation shell, a Tm < 3 + > luminescent shell and an inert separation shell; the Ho < 3 + > luminescent core is doped with Ho < 3 + > and Yb < 3 + >, and the Tm < 3 + > luminescent shell is doped with Tm < 3 + > and Yb < 3 + >. The prepared up-conversion fluorescence nanometer temperature probe adopts a temperature-dependent fluorescence intensity ratio detection method, and is applied to non-contact temperature detection. Compared with a traditional up-conversion fluorescence probe, the up-conversion fluorescence probe has the advantages that on the basis of a synergistic sensitization dominant up-conversion emission mechanism, the fluorescence intensity ratio based on up-conversion emission of Tm < 3 + > and Ho < 3 + > can be used for temperature detection with the wide temperature interval of 15-300 K, ultrahigh sensitivity and ultralow uncertainty under the excitation of a 980 nm near-infrared light source, ultralow-temperature temperature detection is achieved, and the probe has a wide application prospect. And the application range of the nano temperature probe is expanded.