54 results about "Thulium" patented technology

The invention relates to the technical field of laser control, and discloses a laser control method and device for an ultra-pulse thulium-doped fiber laser operation system, and the method comprises the steps: generating a PWM time-base waveform through an FPGA, and generating a reference duty ratio instruction based on a target pumping current value; the total response delay time of the acousto-optic modulator is calculated, the FPGA sends a trigger pulse to the acousto-optic modulator according to the total response delay time, the gated modulation laser is output to the optical fiber output end to obtain an analog voltage signal, and the analog voltage signal and the numerical value of the target power register are used for calculating a duty ratio correction increment; the duty ratio correction increment and the reference duty ratio instruction are updated to a duty ratio register of a PWM time base waveform, and multiple paths of pump cooperative driving waveforms are output. The technical problems of pump current response lag, acousto-optic modulator triggering jitter and optical power nonlinear saturation in an ultra-pulse thulium-doped fiber laser operation system are solved; and the laser pulse energy stability, the response speed and the long-term reliability are improved.

This invention discloses a 2.3 μm fiber laser based on 980 nm laser pumping, relating to the field of mid-infrared fiber laser technology. This fiber laser utilizes fluorotellurate glass fiber co-doped with thulium and erbium ions as the gain medium. It absorbs the 980 nm pump light energy by introducing erbium ion doping, and then achieves Tm through the energy transfer process between erbium and thulium ions. 3+ of 3 H4- 3 The population inversion of the H5 energy level ultimately yields laser output in the 2.3 μm band. This invention utilizes a high-power 980 nm laser as the pump source and a thulium-erbium co-doped fluorotellurate glass fiber prepared by the rod-tube method as the gain medium. By writing fiber gratings with appropriate reflectivity at both ends of the fiber, a resonant cavity with a reflection wavelength of 2.3 μm is constructed, enabling the development of a high-power 2.3 μm laser that can operate stably for a long time.

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 invention provides a thulium-doped optical fiber with high spectral purity and a preparation method thereof, and the thulium-doped optical fiber with high spectral purity adopts a profile design that the refractive index of a main gain layer follows linear gradual change distribution of a linear function and the refractive index of a secondary gain layer is constant, so that the mode distribution of an optical fiber fundamental mode is precisely overlapped with the main gain layer; the secondary gain layer is located at the lowest point of the waveguide refractive index; the design can effectively solve the problem that in the prior art, due to the limitation of the MCVD technology, the doping concentration difference of the main gain layer and the secondary gain layer is caused, and then the optimal emission wavelengths of different gain areas are inconsistent. Besides, depending on the bending loss difference of the main gain layer and the secondary gain layer, on the premise that the gain efficiency of the optical fiber is not sacrificed, effective separation of emission wavelengths of the main gain layer and the secondary gain layer can be achieved through bending regulation, the target wavelength of the main gain layer is reserved, and the non-target wavelength of the secondary gain layer is filtered out. And finally, the spectral purity of the thulium-doped optical fiber is improved.

The application provides a kind of oral ceramic restoration dismantling device and its using method, belong to oral ceramic restoration dismantling technical field.The application oral ceramic restoration dismantling device includes for emitting laser beam thulium-doped fiber laser, for the transmission device for focusing laser beam passes through, for the collimator for coupling laser beam into optical fiber, for the output optical fiber of output laser beam, ceramic restoration 5 and abutment, the laser beam of the output optical fiber output and the surface of ceramic restoration are perpendicular to each other, the output optical fiber, ceramic restoration and abutment are located on the same straight line.The application oral ceramic restoration dismantling device is convenient to operate, solves the destructive of existing oral ceramic restoration dismantling method to abutment and restoration, and the problem of poor comfort.

A multilayer ceramic capacitor and a method of manufacturing the multilayer ceramic capacitor including a capacitor body including a dielectric layer and an internal electrode layer, and an external electrode disposed on an outer surface of the capacitor body, wherein the dielectric layer comprises a first element including at least one selected from cerium (Ce), gadolinium (Gd), samarium (Sm), and lanthanum (La); and a second element including at least one selected from erbium (Er), yttrium (Y), thulium (Tm), and ytterbium (Yb), and a molar ratio of the first element to the second element is 1.5 to 4.0.

The application discloses a kind of medical mid-infrared 1720nm pulsed fiber lasers, it is related to laser medical technical field, including the following steps: acquisition pulsed fiber laser data, respectively calculate thulium ion concentration uniformity index, laser energy intensity and each small target tissue ablation area ablation index, and then construct the thermal map matrix of each small thulium-doped fiber section, and draw the anti-fake color coding diagram of each target tissue ablation area, the spectral analysis technique in the method, multiple linear regression algorithm and convolution neural network algorithm are closely combined with modern information technology, the degree of uniformity of thulium ion concentration distribution and target tissue ablation degree are achieved in real time and comprehensive monitoring, so that the monitored data becomes more accurate index under the same conditions, significantly enhance the intelligent degree of medical mid-infrared 1720n pulsed fiber laser in use process.

The invention discloses a 2-micron short-period laser amplifier based on a thulium-doped positive dispersion fluorotellurite optical fiber, which can solve the problem that a negative dispersion thulium-doped optical fiber is not suitable for performing gain management nonlinear amplification on a 2-micron pulse, and can obtain a pulse width lt. 50 fs, and single pulse energy gt; the femtosecond laser output device has the advantages of being full-fibrillated and compact in structure. The 2-micron femtosecond seed source is femtosecond pulse laser of a 2-micron wave band generated based on nonlinear amplification loop mirror mode locking; the chirped pulse amplifier is used for obtaining sub-picosecond 1.9 mu m femtosecond laser output with the average power greater than or equal to 1W; the optical fiber GMN amplifier is used for obtaining a few-period femtosecond pulse; the high-power optical fiber pulse compressor is a hollow-core optical fiber and is used for carrying out accurate dispersion compensation and high-quality pulse compression.

The application provides a thulium-doped optical fiber and a preparation method thereof. The thulium-doped optical fiber comprises: a fiber core composed of 12-40 concentric doped layers, including Tm 3+ doped layers and Nd 3+ doped layers, and Tm 3+ doped layers and Nd 3+ The doped layers are alternately distributed along the radial direction; a low-refractive-index step layer with a refractive index lower than that of the fiber core; a cladding layer; and a coating layer. The application can realize high-efficiency and high-beam-quality laser output of the thulium-doped optical fiber under high power and reduce front-end heating.

The invention discloses an anti-radiation shielding plate and a preparation method thereof. The anti-radiation shielding plate comprises a middle core layer and two surface reinforcing layers, wherein the two surface reinforcing layers are correspondingly compounded on the upper end face and the lower end face of the middle core layer; the middle core layer comprises the following components in percentage by mass: 25%-45% of tantalum pentoxide (Ta2O5), 26%-46% of bismuth trioxide (Bi2O3), 4%-16% of thulium oxide (TM2O3), 8%-22% of natural rubber (NR) and 2%-6% of a coupling additive; the surface reinforcing layer comprises the following components in percentage by mass: 5%-25% of boron carbide (B4C), 2%-10% of thulium oxide (TM2O3), 65%-85% of natural rubber (NR) and 2%-6% of a coupling additive. The radiation-proof shielding plate has the advantages that through function layering, material cooperation and matrix supporting, the triple core advantages of full-spectrum radiation protection, mechanical property balance and environment-friendly and convenient processing are achieved, the problems that a traditional shielding material is single in function, unbalanced in performance and serious in pollution are solved, industrial production and actual requirements are taken into consideration, and the radiation-proof shielding plate is worthy of popularization and application. And the method can adapt to multi-scene application and is high in use adaptability.

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.

1. Name of the product in this design: Thulium-doped fiber laser therapy machine. 2. Application of this design: for urinary tract lithotripsy and cutting and vaporizing of soft and hard human tissues. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention discloses an implementation method of a tunable palladium diselenide mode-locked fiber laser, which belongs to the technical field of laser, and comprises the following steps: preparing an integrated tuning mode-locked component integrating a tunable band-pass filtering function and a palladium diselenide saturable absorption function; the integrated tuning mode-locking assembly is embedded into an optical fiber laser cavity, a thulium-holmium co-doped optical fiber is adopted as a gain medium, and a tunable mode-locking laser system is formed. External control voltage is applied to the integrated tuning mode-locking assembly to adjust the light-passing wavelength, cooperative mode-locking operation is triggered, and an intracavity mode-locking light field is generated; exporting an intracavity mode-locked light field, and outputting mode-locked laser pulses; wavelength tuning operation is carried out on the tunable mode-locked laser system, spectrum and pulse width measurement is carried out on mode-locked laser pulses, and broadband tunable ultrashort pulse characteristic data are generated. According to the invention, the integrated tuning mode-locking assembly is adopted, and the electronic control wavelength tuning and passive mode-locking mechanism is combined, so that broadband tunable ultrashort pulse laser output can be realized.

1. The name of the design product: thulium-doped fiber laser treatment machine trolley. 2. The use of the design product: for placing and moving thulium-doped fiber laser treatment machine. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

Piezoelectric material comprising a ceramic material with the composition (1-x) ((Bi (a-y) RE y ) FeO3) - x (Ba b TiO3), where the molar fractions x and y satisfy the following conditions 0.28 ≤ x ≤ 0.34 and 0.0005 ≤ y ≤ 0.032 ; where RE is one or more elements from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium, where a = 1.04 and where b = 1.007, where the composition belongs to the perimeter and interior of a polygon which has the following eight points P (x; y) as vertices with respect to the values ​​of x and y: P1 = (0.301; 0.032); P2 = (0.304; 0.004); P3 = (0.304; 0.0315); P4 = (0,310; 0,003); P5 = (0.310; 0.029); P6 = (0.314; 0.026); P7 = (0,327; 0,005); P8 = (0,329; 0,0005).

The application discloses a kind of wavelength greater than 2.1 microns all-fiber short-cavity thulium-doped fiber laser oscillator, including sequentially connected fiber output 1.5 microns pulse pump source, 1.5 / 2 microns fiber wavelength division multiplexer and a section of non-polarization thulium-doped fiber, thulium-doped fiber both ends are engraved with a Bragg fiber grating, 1.5 microns pump light is generated by reverse, core pumping thulium-doped fiber reverse output dominant 2.1 microns above wavelength band laser signal, and along thulium-doped fiber positive single pass 1.8 microns broadband amplified spontaneous emission, the amplified spontaneous emission as a second reverse pump source, the gain of 2.1 microns above wavelength band is improved, and the pulse laser output greater than 2.1 microns is generated.The application structure is compact, simple, can replace holmium-doped fiber laser to realize wavelength greater than 2.1 microns high efficiency, high peak power laser output.

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 relates to a thulium-terbium co-doped calcium yttrium aluminate near-infrared waveband laser crystal and a preparation method and application thereof. x Tb y CaY 1‑x‑y AlO4, wherein the value range of x is 0.001-0.05, the value range of y is 0.0001-0.002, the space group is I4 / mmm, and the crystal is tetragonal. Compared with the prior art, the laser crystal can efficiently realize near-infrared waveband laser output near 1.5 microns and can be applied to the fields of medical treatment, military affairs, communication detection and the like.

The invention provides a broadband low-differential-mode-gain few-mode thulium-doped optical fiber amplifier and a design method thereof, and relates to the technical field of optical fiber communication, and the method comprises the steps: obtaining the inner ring radius and the outer ring radius of an annular fiber core, the refractive index of the annular fiber core and the refractive index of an outer cladding layer, and obtaining the ratio of the normalized frequency to the radius of the annular fiber core through calculation; adjusting the annular fiber core and the groove structure based on the ratio of the normalized frequency to the radius of the annular fiber core to obtain a thulium ion doping distribution curve; analyzing the thulium ion doping distribution curve to obtain an overlapping integral of a pumping mode and a signal mode; calculating the overlapping integral of the pumping mode and the signal mode to obtain an average overlapping integral and a maximum overlapping difference; and adjusting parameters of the thulium ion doping distribution curve based on the average overlap integral and the maximum overlap difference to obtain a design result of the few-mode thulium-doped optical fiber amplifier. The problems of how to simplify the manufacturing process and improve the reliability of a finished product are solved.

This invention discloses a mid-infrared multi-wavelength active-passive hybrid modulation all-fiber laser, comprising a cascaded 976nm laser pump source, a 976nm laser pump source pigtail, a pump coupling device, an isolator, a first fiber grating, an erbium-doped active fiber, a second fiber grating, a thulium-doped active fiber, a third fiber grating, a fourth fiber grating, a fifth fiber grating, a dysprosium-InF-doped active fiber, a sixth fiber grating, a seventh fiber grating, a praseodymium-doped active fiber, an eighth fiber grating, a ninth fiber grating, and a tenth fiber grating, and a laser output point. The first and third fiber gratings constitute a first resonant cavity; the straight-cut end faces of the second and sixth fiber gratings constitute a second resonant cavity; the fourth and tenth fiber gratings constitute a third resonant cavity; the fifth and ninth fiber gratings constitute a fourth resonant cavity; and the seventh and eighth fiber gratings constitute a fifth resonant cavity.

This invention provides a thorium-doped fluoride crystal, its preparation method, and a solid-state nuclear optical clock using the thorium-doped fluoride. The thorium-doped fluoride crystal uses SrF2, LiF, BaF2, and LiF+BaF2 as matrix materials, respectively, and ThF4 as a dopant material. Single crystals of Th:SrF2, Th:LiF, Th:BaF2, and Th:BaLiF3 are obtained through a melt growth process according to a pre-set molar percentage of the raw materials. The thorium-doped fluoride crystal of this invention has a low melting point and simple composition, which is beneficial for achieving high-quality crystal growth. It has an extremely wide band gap, high transmittance in the vacuum ultraviolet band, and a high Th doping concentration, which helps reduce absorption loss and background luminescence in the nuclear transition emission band, and is beneficial for the excitation and detection of nuclear transition signals. It can be used as a preferred material for applications based on… 229 A solid-state nuclear optical clock based on the transition of the Th atom nucleus.

This invention relates to the field of laser control technology and discloses a laser control method and device for an ultrapulse thulium-doped fiber laser surgical system. The method includes: generating a PWM time base waveform through an FPGA, and simultaneously generating a reference duty cycle command based on the target pump current value; calculating the total response delay time of the acousto-optic modulator, sending the total response delay time to the acousto-optic modulator via a trigger pulse from the FPGA, outputting the gated modulated laser to the fiber optic output end to obtain an analog voltage signal and a target power register value to calculate the duty cycle correction increment; updating the duty cycle correction increment and the reference duty cycle command to the duty cycle register of the PWM time base waveform, and outputting a multi-channel pump collaborative drive waveform. This invention solves the technical problems of pump current response lag, acousto-optic modulator trigger jitter, and optical power nonlinear saturation in ultrapulse thulium-doped fiber laser surgical systems, improving the stability of laser pulse energy, response speed, and long-term reliability.

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.

1. Name of the designed product: thulium-doped fiber laser treatment machine (two). 2. Use of the designed product: the product is a kind of medical laser treatment equipment, which is used for emitting laser for surgical treatment in medical institutions. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: perspective view.

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.

The invention relates to low-hydroxyl highly thulium-doped intermediate infrared fluorophosphate laser glass and a preparation method thereof. The low-hydroxyl highly thulium-doped mid-infrared fluorophosphate laser glass provided by the invention has relatively high rare earth ion doping concentration, relatively good thermal stability, relatively low hydroxyl content and good mid-infrared luminescence property. The molar percentage of Tm < 3 + > can reach 9 mol%, and high-concentration doping of Tm < 3 + > is realized. A differential thermal curve chart of the low-hydroxyl highly thulium-doped intermediate infrared fluorophosphate laser glass shows delta T (Tx-Tg) gt; when the temperature is 100 DEG C, the temperature difference is relatively large. The hydroxyl absorption coefficient of the low-hydroxyl highly-thulium-doped intermediate infrared fluorophosphate laser glass at 3200 cm <-1 > is only 0.24 cm <-1 >, and the low-hydroxyl highly-thulium-doped intermediate infrared fluorophosphate laser glass has low hydroxyl content. The preparation method is simple and convenient, has low requirements on equipment and environment, and is beneficial to industrial production; the glass has good forming ability, overcomes the problem that the glass is easy to crystallize, has excellent optical performance, and can be well applied to the fields of laser glass and optical fibers.

The present disclosure provides a multilayer ceramic capacitor and a method of manufacturing the same, the multilayer ceramic capacitor including: a capacitor body including a dielectric layer and an inner electrode layer; and an external electrode disposed on an outer surface of the capacitor body, in which the dielectric layer includes: a first element including at least one selected from the group consisting of cerium (Ce), gadolinium (Gd), samarium (Sm), and lanthanum (La); and a second element including at least one element selected from the group consisting of erbium (Er), yttrium (Y), thulium (Tm), and ytterbium (Yb), and a molar ratio of the first element to the second element is 1.5 to 4.0.

The invention relates to the technical field of medical instruments, and discloses an ultra-pulse thulium fiber laser therapy apparatus with a self-adaptive air-cooling heat dissipation function, the ultra-pulse thulium fiber laser therapy apparatus comprises a supporting table, a heat dissipation module, a joint supporting arm and a six-axis mechanical arm, the side surface of the supporting table is fixedly connected with the heat dissipation module, the top of the supporting table is fixedly connected with the joint supporting arm and the six-axis mechanical arm, and the six-axis mechanical arm is fixedly connected with the joint supporting arm. A heat dissipation control module is arranged in the heat dissipation module, the bottom of the supporting table is fixedly connected with the base, the joint supporting arm comprises a first supporting arm, a second supporting arm and a screen supporting arm, one end of the first supporting arm is slidably connected with the second supporting arm, the other end of the first supporting arm is fixedly connected with the control table, and the second supporting arm is slidably connected with the screen supporting arm. The six-axis mechanical arm comprises a mechanical arm body, a connecting block and a laser, one end of the connecting block is connected with the mechanical arm body, and the other end of the connecting block is fixedly connected with the laser. Through self-adaptive adjustment of the heat dissipation control module, the reliability of heat dissipation is ensured.