445 results about "Ytterbium" patented technology

The invention provides a high-concentration ytterbium-doped double-clad silicate optical fiber single-frequency amplifier which comprises a single-frequency laser seed source, a double-clad optical fiber pre-amplifier and a high-concentration ytterbium-doped double-clad silicate optical fiber main amplifier which are connected in sequence. The single-mode optical fiber pre-amplifier is used for primarily amplifying the single-frequency laser; the double-clad optical fiber pre-amplifier is used for further amplifying the optical signal output from the single-mode pre-amplifier; and the high-concentration ytterbium-doped double-clad silicate optical fiber main amplifier is used for performing high-power amplification on the signal light amplified by the double-clad optical fiber pre-amplifier and outputting specific high-power narrow-linewidth single-frequency laser. Single-frequency laser seed source low-noise coefficient pre-amplification is achieved through a front multi-stage pre-amplification system, a high-concentration ytterbium-doped double-clad silicate optical fiber is adopted in a final main amplifier, the length of a needed active optical fiber is shortened through provided high gain, the stimulated Brillouin scattering effect is restrained, and the optical fiber is high in gain and high in power consumption. And the output power of the single-frequency narrow-linewidth optical fiber amplifier is improved.

The invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The invention provides a surface-modified sulfide electrolyte and a preparation method thereof, and an all-solid-state battery, the surface-modified sulfide electrolyte comprises a sulfide electrolyte and a modification layer coated on the surface of the sulfide electrolyte, the chemical general formula of the modification layer is LiaMbNcXd, 0 < = a < = 3, 0 < = b < = 1, 0 < = c < = 1, 0 < = d < = 6, and 0 < = c < = 1. M is at least one element of magnesium, aluminum, calcium, iron, zirconium, niobium, tantalum, tungsten, gadolinium, yttrium, indium, hafnium, lanthanum and ytterbium, and X is at least one element of oxygen, sulfur, fluorine, chlorine, bromine and iodine. According to the surface-modified sulfide electrolyte, the modification layer with high ionic conductivity and high oxidation potential is coated outside the sulfide electrolyte, so that when the surface-modified sulfide electrolyte is applied to a positive electrode of an all-solid-state battery, the modification layer can improve the oxidation potential of the electrolyte on the premise of not reducing the ionic conductivity of the electrolyte; the effects of improving the interface stability between the positive electrode active material and the sulfide electrolyte and further improving the cycle performance of the battery are achieved.

The embodiment of the invention discloses an optical fiber laser and a green laser device. The fiber laser comprises a seed source and at least one stage of fiber amplifier. The seed source comprises a first pumping source, a first pumping beam combiner, a first fiber bragg grating, a first ytterbium-doped fiber, a second fiber bragg grating and a second ytterbium-doped fiber; the optical fiber amplifier comprises a second pumping source, a second pumping beam combiner and a third ytterbium-doped optical fiber; the second pumping source comprises a third pumping source, a third pumping beam combiner, a third fiber bragg grating, a fourth ytterbium-doped fiber and a fourth fiber bragg grating. The optical fiber laser provided by the embodiment of the invention adopts a cascade pumping technology, so that the power and brightness of fundamental frequency laser output by the narrow linewidth optical fiber laser are effectively improved, the nonlinear effect of the fundamental frequency laser and the thermal load of the optical fiber are remarkably reduced, and the beam quality and output power of the fundamental frequency laser are remarkably improved; and a foundation is laid for higher green light output.

The embodiment of the invention discloses a light amplification device and a related system and method. The light amplification device comprises an optical fiber isolator, a pump light source, a beam combiner and an EYDF. A large amount of pump light in the EYDF cannot be completely absorbed by ytterbium ions, and ytterbium-band ASE light generated by the ytterbium ions can be further amplified by the pump light, so that effective amplification of signal light by the pump light is limited by the ytterbium-band ASE light. According to the embodiment of the invention, the optical fiber isolator in the light amplification device is modified, the optical fiber isolator can reflect the ytterbium-band ASE light as an auxiliary signal back to the EYDF, the excited amplification of the auxiliary signal and the absorption of the auxiliary signal by the EYDF can effectively inhibit the EYDF from generating the ytterbium-band ASE light, the self-oscillation and self-pulsation of the ytterbium-band ASE light are avoided, and the reliability of the light amplification device is improved. Therefore, the pumping conversion efficiency and the stability of the output power are improved. Meanwhile, the optical amplification device provided by the embodiment of the invention can effectively inhibit the EYDF from generating the ytterbium-band ASE light without adding an additional device, and is beneficial to reducing the cost and the power consumption.

The invention relates to an erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal as well as a preparation method and application thereof, and belongs to the field of nonlinear optical crystals. The erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal provided by the invention is prepared from Li2CO3, Nb2O5 and Er2O3 and / or Yb2O3 with the purity of 99.99%; wherein the atomic molar ratio of Li to Nb is 0.80-0.92, and the doping molar fraction of Er2O3, the doping molar fraction of Yb2O3 and the total doping molar fraction of Er2O3 and Yb2O3 are respectively 0.75%-1.25%. The erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal prepared by the invention is high in crystallization quality, large in doping concentration, uniform and transparent as a whole and free from obvious macroscopic defects, and can be used for preparing a high-quality lithium niobate bulk material and a submicron lithium niobate film so as to further prepare high-efficiency photoelectric functional devices such as a laser, an amplifier and a detector; and a foundation is laid for development of the fields of integrated photonics and the like.

The invention belongs to the technical field of light-emitting materials, and particularly relates to a near-infrared light-emitting ytterbium-doped quantum dot material and a preparation method and application thereof. According to the preparation method of the near-infrared light-emitting ytterbium-doped quantum dot material, a Yb-doped perovskite quantum dot synthesis method which is high in near-infrared light-emitting intensity, good in stability and simple in preparation is innovatively provided, short-chain amine is used in the preparation process, and the near-infrared light-emitting ytterbium-doped quantum dot material has high reaction activity, small steric hindrance and high near-infrared light-emitting efficiency. The complex ability with precursor raw materials is low, chemical bonds between halogen and metal ions are easy to open in the reaction process, and the complex is matched with long-chain amine (such as oleylamine and the like) in a perovskite quantum dot system prepared by a conventional injection method, so that doping of rare earth Yb ions is facilitated, the Yb ions smoothly enter perovskite crystal lattices, and the perovskite quantum dot is prepared. The near-infrared luminous intensity of the material is improved.

The present invention relates to a tandem organic light-emitting device comprising a plurality of light-emitting layers and, more specifically, to an organic light-emitting device comprising a novel charge generation layer (CGL). The CGL according to the present invention has a first compound having 4,5-diazaspirobifluorene as the core thereof, which is applied as an electron transport material of an N-type CGL. In addition, a second compound having at least one tertiary amine as the core thereof is applied as a hole transport material of a P-type CGL, and the combination of the first compound and the second compound lowers the driving voltage of the device and further improves the efficiency and lifespan thereof. Furthermore, the organic light-emitting device of the present invention can achieve further improved device performance through a CGL comprising the first compound, lithium or ytterbium, the second compound and a third compound at the same time.

The invention provides a rapid screening method of a medium-high-entropy rare earth disilicate material of ytterbium disilicate, which comprises the following steps: selecting a rare earth element which can form a monoclinic beta phase after a single rare earth element is equimolar doped with a Yb2Si2O7 material as a doping element to obtain the average bond length of RE-O; classifying the doping elements according to the condition that the average key length is increased or reduced, and sorting according to the doping weight; establishing a periodic table of element orthogonal incremental doping according to the sorting result, wherein the materials of the same period or group have the same incremental doping element relative to the materials of the previous period or group; carrying out material preparation and a thermal-mechanical property experiment; and summarizing experimental results into a periodic table to form a thermal-mechanical property periodic table, and selecting the most suitable material or elements needing to be doped. According to the method disclosed by the invention, the multi-component doped medium-entropy or high-entropy material can be quickly screened, and the benefits of various doped elements on certain properties brought by the medium-entropy or high-entropy material can be found out according to the thermal-mechanical property periodic table.

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 method comprises the following steps: weighing an oxide precursor of metal indium, an oxide precursor of metal M, an ammonium salt and a lithium salt according to a chemical formula of indium-based halide, fully mixing, and calcining in an inert atmosphere to obtain the indium-based halide solid electrolyte. Forming an indium-based halide solid electrolyte through a solid-phase reaction; wherein M is selected from at least one of magnesium, calcium, strontium, barium, aluminum, gallium, indium, bismuth, scandium, yttrium, zinc, germanium, tin, lanthanum, cerium, samarium, gadolinium, holmium, erbium and ytterbium. The method can greatly simplify the synthesis process, reduce the raw material cost and realize industrial batch preparation.

The invention relates to an additive capable of improving oxidation resistance of an ultrathin copper foil and a copper foil produced by the additive. The additive comprises ytterbium ions, butylated hydroxytoluene, polyethylene glycol and a brightener. The additive is simple in formula, the number of contained components is small, the process is easy to control, the additive is added into electrolyte to electrolyze the copper foil, and it can be achieved that the 6-micron ultrathin copper foil is free of oxidation discoloration after being placed for 120 h at the temperature of 85 DEG C and the relative humidity of 85% and free of oxidation discoloration after being baked for 60 min at the temperature of 230 DEG C.

Sensors containing one or more metal oxides as the sensor material are used for detecting pathogen-derived VOCs, e.g., VOCs emitting from infectious wounds. The metal oxides may contain one or more metal elements selected from aluminum, antimony, bismuth, boron, cerium, chromium, cobalt, copper, gold, indium, iridium, iron, lanthanum, lead, manganese, molybdenum, nickel, niobium, osmium, palladium, platinum, rhodium, ruthenium, selenium, silicon, silver, tantalum, tellurium, terbium, tin, titanium, tungsten, vanadium, ytterbium, yttrium, zinc, and zirconium. A sensor device may have one or more sensors, which detects and records a variety of VOCs that are indicative of existence of pathogens, and the pathogens are associated with dieses and / or infections.

A sensor comprising one or more metal oxides as sensor material is used to detect pathogen-derived VOCs, such as those released from an infected wound. The metal oxides can comprise one or more metal elements selected from aluminum, antimony, bismuth, boron, cerium, chromium, cobalt, copper, gold, indium, iridium, iron, lanthanum, lead, manganese, molybdenum, nickel, niobium, osmium, palladium, platinum, rhodium, ruthenium, selenium, silicon, silver, tantalum, tellurium, terbium, tin, titanium, tungsten, vanadium, ytterbium, yttrium, zinc, and zirconium. The sensor device can have one or more sensors that detect and record various VOCs indicative of the presence of pathogens, which are associated with mortality and / or infection.

The invention discloses a rare earth modified high-strength aluminum alloy and a preparation method of an aluminum alloy fastener. The aluminum alloy comprises the following chemical components in percentage by mass: 0.4 to 1.6 percent of Mg, 0.4 to 1.0 percent of Si, 0.1 to 0.2 percent of Cu, 0.1 to 1.0 percent of Zn, 0.1 to 1.0 percent of Mn, 0.1 to 0.6 percent of Cr, 0.1 to 0.3 percent of V, 0.03 to 0.3 percent of Ag, 0.01 to 0.35 percent of Ti, 0.01 to 0.35 percent of Zr, 0.01 to 0.35 percent of Hf, less than or equal to 0.40 percent of Fe, 0.05 to 0.5 percent of La, 0.05 to 0.5 percent of Yb, 0.05 to 0.5 percent of Sm, less than or equal to 0.03 percent of other inevitable single impurity elements, less than or equal to 0.15 percent of total impurity elements and the balance of aluminum. Aiming at the problems of low room temperature strength, insufficient plasticity, poor thermal stability and the like of the existing 6 * * * series aluminum alloy bolt, the rare earth modified high-strength aluminum alloy is prepared by adding a proper amount of rare earth elements such as lanthanum, samarium and ytterbium and reasonably optimizing alloy elements through the processes of smelting, refining, casting and the like, and is used for manufacturing the bolt, so that the bolt has a good application prospect. And the bolt can have relatively high room-temperature strength, plasticity and thermal stability so as to meet the requirements of various fields.

The invention belongs to the technical field of radioactive isotope separation and purification, and particularly relates to a device for separating and purifying carrier-free lutetium 177. Comprising a mounting rack, a salt transfer assembly arranged in the middle of the front side of the mounting rack, a valve assembly arranged in the middle of the rear side of the mounting rack, a separation and purification column arranged on one side of the salt transfer assembly, a sample injection system arranged on one side of the valve assembly, a fraction assembly arranged above the mounting rack and a waste liquid assembly arranged on one side of the mounting rack, the control terminal is used for controlling the sampling system and the on-off of valves in the valve assembly so as to control the flowing of liquid in the separation and purification device, so that the functions of ytterbium and lutetium separation, lutetium-to-salt concentration and ytterbium-to-salt recovery in the separation and purification device are realized. The problems that in the prior art, an overall device for separating and purifying carrier-free lutetium-177 is large in size and occupied area, the requirement for the automation control degree is high, and the service life of parts is short are solved.

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 belongs to the technical field of nano material preparation, and provides a preparation method and application of a rare earth ytterbium-doped copper oxide nano material. The method comprises the following steps: dissolving rare earth ytterbium salt, copper salt and a surfactant in a solvent, and uniformly stirring; dissolving an organic ligand in a solvent; stirring and mixing the two solutions, transferring into a reaction kettle, and carrying out hydrothermal reaction; and centrifugally washing the obtained product with ethanol, and drying to obtain the rare earth ytterbium doped metal organic precursor nano material. And placing the obtained nano material in a muffle furnace for high-temperature calcination to obtain the rare earth ytterbium doped copper oxide material. The preparation method provided by the invention is simple, green, pollution-free and high in practical degree, and the obtained rare earth ytterbium-doped copper oxide nano material can be used as a catalyst for synthesizing ammonia by electrolytic nitrate reduction, and shows that the rare earth ytterbium-doped copper oxide nano material has relatively high ammonia yield and Faraday efficiency for synthesizing ammonia by nitrate reduction.

The invention discloses a dielectric ceramic material and a preparation method thereof, and relates to the technical field of dielectric ceramic materials, and the technical key points are as follows: the dielectric ceramic material comprises barium titanate (BaTiO3) which accounts for 80-99 wt% of the weight of the finished dielectric ceramic material; the dielectric ceramic material also comprises a dopant, and the dopant accounts for 1-20wt% of the weight of the dielectric ceramic material finished product. The doping agent comprises silicon dioxide (SiO2), magnesium carbonate (MgCO3), manganous-manganic oxide (Mn3O4), barium titanate (BaCO3) and rare earth oxide D2O3; wherein D represents any one or more of yttrium (Y), holmium (Ho), ytterbium (Yb), gadolinium (Gd) and dysprosium (Dy); the invention provides a dielectric ceramic material which meets the EIAX7R standard and still has a high IR characteristic and a low dielectric loss factor (tan delta) in a high-temperature environment and a preparation method of the dielectric ceramic material.

The invention discloses a 980nm-waveband ytterbium-doped fiber laser with expandable power and high beam quality. The 980nm-waveband ytterbium-doped fiber laser is composed of a single-mode seed source, a K-level fiber amplifier and an output coupling end. The single-mode seed source adopts an optical fiber oscillator and is composed of a first gain optical fiber, a first pumping signal beam combiner, a first pumping module, a first cladding light filter, a second cladding light filter, a high-reflectivity optical fiber grating, a low-reflectivity optical fiber grating, a first filter and a mode field adapter. The K-stage optical fiber amplifier is composed of K single-stage optical fiber amplifiers and K-1 filters, and except the last single-stage optical fiber amplifier, the output end of each single-stage optical fiber amplifier is connected with one filter. Each of the K single-stage optical fiber amplifiers comprises a section of gain optical fiber, two pumping signal beam combiners, two pumping modules and two cladding light filters, and the gain optical fiber is a step double-cladding ytterbium-doped optical fiber. According to the invention, high beam quality output can be ensured, and the total output power can be improved.

The invention relates to the technical field of rare earth element separation methods, in particular to a method for separating ytterbium and lutetium by using a phosphate adsorbent, which comprises the following steps: loading a phosphate solution on a porous solid-phase carrier by using a vacuum impregnation method, and carrying out reduced pressure evaporation and drying to obtain a phosphate solid adsorbent; filling an exchange column with the solid adsorbent to obtain the exchange column filled with the solid adsorbent; enabling a nitric acid solution containing ytterbium and lutetium to flow through an exchange column filled with a solid adsorbent to complete a column adsorption process; and performing elution, performing desorption by using a desorption solution to obtain the regenerated exchange column filled with the solid adsorbent, respectively collecting the ytterbium solution and the lutetium solution, completing the separation process, and repeating the steps. By adopting the steps, the separation of ytterbium and lutetium is directly realized from the nitric acid solution containing ytterbium Yb and lutetium Lu through column adsorption separation, leaching and desorption processes, and high-purity ytterbium and lutetium products are prepared.

The invention discloses an ultrafast laser generating device. The device comprises an ytterbium-doped femtosecond laser light source, a first focusing lens, a first optical window, a first-stage energy transfer device, a first-stage hollow-core capillary optical fiber, a second optical window, a concave reflecting mirror, a half-wave plate, a wire grid polarizing film, a second focusing lens, a third optical window, a first air chamber, a second-stage hollow-core anti-resonance optical fiber, a second air chamber and a fourth optical window. The invention discloses a 90-degree off-axis parabolic mirror and a frequency resolution optical switch pulse measuring device. The incident pulse spectrum is broadened by utilizing a self-phase modulation effect by changing the type and the air pressure of inert gas in the first-stage hollow-core capillary optical fiber; and then the second-stage hollow-core anti-resonance optical fiber is filled with inert gas to generate an air pressure gradient, and sub-20fs-order ultrafast laser flexible transmission is finally realized by utilizing a soliton self-compression effect.

The invention relates to a light-weight high-power pumping source which comprises a shell and N sets of pumping light chips installed in the shell in a partitioned mode, N is an integer larger than or equal to 1, and each set of pumping light chips comprises a corresponding coupling mirror set. Each group of pump light chips is used for emitting pump laser with different wavelengths, the pump laser is subjected to beam shaping through the respective corresponding coupling mirror group and then is coupled to the output optical fiber through the output mirror group, and the shell is made of a graphene reinforced aluminum-based composite material. On one hand, excellent mechanical performance and stability are kept, and on the other hand, the density of the fiber laser is far lower than that of oxygen-free copper, so that the weight of a pumping source under unit power is effectively reduced, and the whole fiber laser system is lighter and easier to install and maintain; meanwhile, the multi-wavelength pump light chip is introduced, the wavelength distribution of the pump light is optimized, the pump light is made to better conform to the absorption characteristic of the ytterbium-doped optical fiber, the thermal load of the ytterbium-doped optical fiber is effectively dispersed, the threshold value of the mode instability effect is remarkably increased, and therefore the power output capacity and the long-term operation stability of an optical fiber laser system are improved.

The invention discloses a preparation control optimization method of a metal ytterbium target for an OLED (Organic Light Emitting Diode) display screen. The method comprises the following steps: acquiring impurity spectrum scanning data of a metal ytterbium raw material, analyzing impurity distribution characteristics and determining a melting control temperature; after a cast ingot is formed, the internal pore distribution condition is obtained, a pore density gradient field is constructed, a forging and pressing path planning vector is generated, and precise forging and pressing path design is achieved; in the forging and pressing process, forging and pressing vibration data and displacement data are collected in real time, the influence of vibration on cast ingot position deviation is analyzed, then vibration deviation correction is conducted on a forging and pressing path, and an optimized path plan is formed. And by iteratively optimizing the forging and pressing path, the density of the cast ingot is gradually improved and meets the preset requirement. The method effectively solves the problems of difficult impurity control, non-uniform pore distribution, forging and pressing deviation and the like in the preparation process of the metal ytterbium target material, and the purity and compactness of the target material are remarkably improved.

The invention discloses a high-strength rare earth aluminum alloy material, a preparation method and application. The aluminum alloy material comprises, by weight, 0.2%-1.2% of Si, 0.2%-1.5% of Mg, 0.1%-0.2% of Cu, 0.1%-1.0% of Zn, 0.06%-1.0% of Mn, 0.06%-0.6% of Cr, 0.0.08%-0.3% of V, 0.03%-0.3% of Ag, 0.06%-0.4% of Ti, 0.01%-0.35% of Zr, 0.01%-0.35% of Hf, smaller than or equal to 0.20% of Fe, 0.03%-0.6% of La, 0.03%-0.4% of Yb, 0.03%-0.8% of Sm, smaller than or equal to 0.04% of other inevitable single impurity elements, smaller than or equal to 0.15% of the total amount of the impurity elements and the balance aluminum. In order to solve the problems of low room temperature strength, insufficient plasticity, poor thermal stability and the like of the existing 6000 series aluminum alloy, alloy elements are reasonably optimized, a proper amount of rare earth elements lanthanum, samarium and ytterbium are added, and a high-performance aluminum alloy material is developed and used for bolt manufacturing, so that the bolt has high room temperature strength, plasticity and thermal stability, and the service life of the bolt is prolonged. And the requirements of various fields for high-performance aluminum alloy bolts are met.

The present invention provides a calcium-based thermochemical heat storage material modified with high-entropy fluorite oxide and a preparation method thereof. The material comprises a calcium-based material and a high-entropy fluorite oxide, with the calcium-based material accounting for 70-85% by mass. The calcium-based material is calcium oxide, and the high-entropy fluorite oxide is a fluorite-structured oxide formed by zirconium, cerium, lanthanum, neodymium, and ytterbium, with a molar ratio of 1:1:1:1:1 for the oxides of zirconium, cerium, lanthanum, neodymium, and ytterbium. The invention utilizes the high-entropy fluorite oxide as an anti-sintering component to disperse calcium oxide and prevent its sintering, while simultaneously promoting the adsorption, dissociation, and migration of CO2 on the surface of the material, thereby enhancing the cycling stability and energy density of the heat storage material.

The invention discloses a wavelength and repetition frequency independent adjustable gain-competition-free polarization-maintaining fiber common-cavity double-optical-comb mode-locked laser and an adjusting method, and relates to the technical field of optical frequency combs. In order to solve the problems that a system is easily influenced by an external environment, the anti-interference capability is poor and gain competition exists between optical combs due to the existence of a single-mode optical fiber in an existing optical fiber double-optical-comb structure, the invention provides an optical fiber double-optical-comb structure. According to the technical scheme, the laser comprises a polarization-maintaining pump laser, a first polarization-maintaining optical fiber coupler, a polarization-maintaining optical fiber wavelength division multiplexer, a polarization-maintaining ytterbium-doped optical fiber, a polarization-maintaining collimator and a blazed grating, laser output by a second polarization-maintaining optical fiber coupler is combined through a polarization-maintaining polarization beam combiner, and the polarization-maintaining polarization beam combiner serves as a horizontal polarizer and a vertical polarizer; the separated polarized laser is respectively coupled to a slow axis and a fast axis of a common-end tail fiber, and a semiconductor saturable absorber is used as a reflection end face. According to the invention, a full polarization-maintaining structure is adopted, the external environment resistance is strong, and the stability is greatly improved.

The invention provides an ytterbium-doped perovskite quantum dot and a preparation method and application thereof. The preparation method comprises steps as follows: a cesium source and a quaternary ammonium salt chlorine source are sequentially added to a quantum dot precursor solution, a mixed solution is obtained and heated for a reaction, the perovskite quantum dots are obtained, and the quantum dot precursor solution comprises a lead source, an ytterbium source, a halogen source, a ligand and a solvent. The cesium source and the quaternary ammonium salt chlorine source are jointly injected, effective doping of rare earth isovalent ion ytterbium in perovskite is achieved, near-infrared luminescence of the quantum dots is improved, and the storage stability of the quantum dots is enhanced.

An optical filter includes: an absorber including an inorganic material including ytterbium; an absorption layer including a dye and a resin, the dye having a maximum absorption wavelength between 350 nm and 1,200 nm; and a dielectric multilayer film. The absorber may have a flat plate shape, and the absorber may have a thickness of 3 mm or less.

The invention provides a low-cost ytterbium-doped Yb calcium silicate niobium aluminum gallium laser crystal and a preparation method and application thereof. According to the invention, Al < 3 + > is introduced to replace 50% Ga < 3 + >, Yb < 3 + > ions are doped, and the Yb: Ca3NbAl < x > Ga < 3-x > Si2O14 laser crystal (0lt; xlt; and 3) the raw material cost is greatly reduced, the growth period is shortened, the laser performance of the crystal is improved, the absorption cross section and the emission cross section of the crystal are increased, the half-peak width of absorption and emission peaks is broadened, the oblique efficiency and the light conversion efficiency of continuous laser output are further improved, the laser threshold value is reduced, and watt-level continuous laser output is obtained.