138 results about "Thulium" patented technology

The invention provides an ultra-pulse thulium fiber laser therapy apparatus which comprises a laser, an electrical device and a coupler, the laser is connected with the coupler through a thulium fiber, the laser and the coupler are respectively connected with the electrical device through circuits, and the electrical device is connected with the coupler through a thulium fiber. The electrical device controls the operation of the laser and the coupler, the optical fiber is a thulium optical fiber emitted by the laser, and the wavelength of the laser is 1940 nanometers. The ultra-pulse thulium fiber laser therapy apparatus replaces a previous water cooling device and adopts a 1940nm laser internal air cooling device, so that the ultra-pulse thulium fiber laser therapy apparatus is more compact in structure, lighter in weight and smaller in size, and the problems of noise, frequent maintenance and replacement and the like caused by a large cooling-water machine are solved.

The invention provides a quasi-continuous thulium-doped fiber laser capable of synchronously suppressing relaxation oscillation and self-pulse, relates to the technical field of fiber laser, and is used for simultaneously realizing suppression of a self-pulse effect and a relaxation oscillation peak. Comprising a continuous driving module, a pulse driving module, a semiconductor laser pumping source, a high-reflectivity fiber bragg grating, a low-reflectivity fiber bragg grating, a beam combiner, a thulium-doped gain fiber, a passive fiber, a cladding pumping stripper and a laser output port, the continuous pump light and the pulse pump light are respectively driven by the continuous driving module and the pulse driving module to output continuous pump light and pulse pump light; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating form a resonant cavity structure, the thulium-doped gain fiber serves as a gain medium of the thulium-doped fiber laser and absorbs pump light to generate population inversion, laser oscillation is formed by combining the resonant cavity of the laser, relaxation oscillation suppression is achieved, and meanwhile longitudinal mode distribution of the laser is effectively disrupted.

The invention discloses a high-tolerance synchronous dual-band pulse laser, and relates to the field of lasers, and the laser comprises a first resonant cavity and a second resonant cavity; the first resonant cavity comprises a first pumping source and an optical annular cavity formed by sequentially connecting a first wavelength division multiplexer, a first thulium-doped optical fiber, a first optical coupler, a first isolator, a second wavelength division multiplexer, a high-nonlinearity saturable absorber, a third wavelength division multiplexer and a first polarization controller; the second resonant cavity comprises a second pumping source and an optical annular cavity which is formed by sequentially connecting a fifth wavelength division multiplexer, a second erbium-doped fiber, a second optical coupler, a second wavelength division multiplexer, a high-nonlinearity saturable absorber, a third wavelength division multiplexer, an electric control adjustable delay line, a fourth wavelength division multiplexer, a second polarization controller and a second isolator, and the fifth wavelength division multiplexer, the second erbium-doped fiber, the second optical coupler, the high-nonlinearity saturable absorber, the third wavelength division multiplexer, the electric control adjustable delay line, the fourth wavelength division multiplexer, the second polarization controller and the second isolator; and the first optical coupler and the second optical coupler respectively output synchronization pulses in the wave bands of 2 microns and 1.5 microns. The device is compact in structure, low in manufacturing cost, convenient to operate and capable of covering the mid-infrared band of 2 microns.

The invention relates to a miniaturized medium-long wave infrared solid-state laser in which a thulium-doped laser directly pumps a ZGP crystal, the thulium-doped laser takes two laser diodes with the central emission wavelength of 793 nm as pumping sources, two Tm: YAP crystals with the same parameters are cascaded and placed in a U-shaped resonant cavity to serve as laser gain media, and an acousto-optic Q crystal controls intra-cavity loss in the resonant cavity, so that the thulium-doped laser directly pumps the ZGP crystal. Pulse laser with the wavelength of 1.94 m is output; the 1.94 m pulse thulium laser serves as pump light and passes through the ZGP-OPO module, and 2.8 m signal light and 6.2 m idler frequency light are obtained. The Tm laser outputs 1.94 m laser through primary oscillation to directly serve as a pump source, the ZGP-OPO outputs medium-long wave infrared laser in a nonlinear mode, the overall light path structure of the medium-long wave laser is simplified, and the electro-optical conversion efficiency is improved.

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

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

The utility model discloses a thulium-doped fiber laser based on a composite cavity structure. The thulium-doped fiber laser comprises a pumping source, a thulium-doped gain active fiber, a high-reflectivity fiber grating HR, a first low-reflectivity fiber grating OC1 and a second low-reflectivity fiber grating OC2, the self-pulse effect is inhibited by adopting a composite resonant structure, so that stable 2-micron fiber laser output is obtained; the overall optical path length is short, and self-pulse suppression can be more effectively achieved under the condition that the overall optical path length is short.

The invention provides an automatic device and method for light emitting and power optimization of 2-micron solid laser. The automatic device comprises a laser pumping source, a plano-convex lens group, a gain medium, a confocal resonant cavity, an output coupling mirror, a five-degree-of-freedom electric displacement table and a regulation and control system. Automatic optimization and stable output of laser power are realized through the design of an asymmetric confocal resonant cavity and micron-order adjustment of a high-precision five-degree-of-freedom electric displacement table in combination with a tolerance optimization algorithm and a gradient descent spiral search algorithm. A thulium-doped CYA disordered crystal is adopted as a gain medium, and the angle of the thulium-doped CYA disordered crystal is adjustable so as to excite a high-order vortex The transmittance of the output coupling mirror is dynamically adjusted according to the working mode, and the intra-cavity power density and the light-to-light conversion efficiency are ensured. The invention has the advantages of high efficiency and stability, strong universality, low cost, diversified output and the like, is suitable for the fields of space communication, quantum optics, laser processing and the like, and obviously improves the performance and application range of the laser.

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.

The invention discloses a narrow-linewidth thulium-doped fiber laser oscillator, which is characterized in that a saturable absorption fiber has certain absorption on signal light wavelength and is arranged between a first high-reflectivity fiber bragg grating and a second high-reflectivity fiber bragg grating, and when the laser gain exceeds the loss of a laser resonant cavity formed by the first high-reflectivity fiber bragg grating, the second high-reflectivity fiber bragg grating and a low-reflectivity fiber bragg grating, a thulium-doped fiber is generated; laser oscillation is formed and output through the low-reflection fiber bragg grating; the first and second high-reflectivity fiber gratings form an etalon effect; an etalon effect is formed between the second high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating and between the first high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating; signal light oscillated between the first high-reflectivity fiber bragg grating and the second high-reflectivity fiber bragg grating can form standing waves, and a dynamic grating is formed in the saturable absorption fiber. Under the action of the resonant cavity vernier effect and the saturable absorption dynamic optical fiber, signal light oscillates in a narrow linewidth mode between the first high-reflectivity fiber bragg grating and the second high-reflectivity fiber bragg grating, and the narrowed signal light is injected into the thulium-doped gain optical fiber through the second high-reflectivity fiber bragg grating, so that the laser maintains narrow spectral linewidth operation.

The invention relates to the technical field of medical apparatus and instruments, and discloses an ultra-pulse thulium fiber laser therapy apparatus, which comprises a laser, a coupler, a lithotripsy energy transmission optical fiber, a thulium fiber laser head, an electrical device, a mainboard, an air cooling device and an equipment case, the laser is of an all-fiber structure and outputs 1940-nanometer near-infrared laser, the 1940-nanometer near-infrared laser is transmitted to the thulium fiber laser head through the thulium-doped double-clad fiber, and a collimating lens set is arranged at the light emitting end of the laser head and used for shaping the laser into collimated light beams. An aspheric focusing lens and an optical fiber clamping mechanism are arranged in the coupler, and the coupler is used for focusing the collimated light beam into the lithotripsy energy transmission optical fiber; the lithotripsy energy transmission optical fiber is a multimode quartz optical fiber, the end face is polished and plated with an anti-reflection film, one end is connected with the coupler through an FC / APC interface, and the other end is connected with an external replaceable treatment handle; and the electrical device is electrically connected with the mainboard. According to the invention, efficient and intelligent heat dissipation management is realized, and the energy transmission efficiency and the output stability are improved.

The invention provides a single-frequency laser system and an optical clock and optical tweezers comprising the single-frequency laser system, a first single-frequency laser of the single-frequency laser system is a single-frequency thulium-doped distributed feedback fiber laser, and the first single-frequency laser is used for outputting first single-frequency laser; the thulium-doped optical fiber amplification module is used for receiving the first single-frequency laser and amplifying the power of the first single-frequency laser to form first amplified laser; the second single-frequency laser is used for outputting second single-frequency laser; the erbium-doped fiber amplification module is used for receiving the second single-frequency laser and amplifying the power of the second single-frequency laser to form second amplified laser; the laser beam combining module is used for combining the first amplified laser and the second amplified laser to form combined laser; and the sum frequency module is used for performing sum frequency conversion on the combined laser to form output laser which is output outwards. When the single-frequency laser system is applied to the optical clock, the frequency stability and various performance indexes of the optical clock can be improved; when the method is applied to optical tweezers, the control performance of the optical tweezers on atoms can be improved.

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

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

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 the field of bioanalytical chemistry and environmental monitoring, and discloses a nano fluorescent probe, a preparation method and application thereof, and a method for detecting microcystic toxins in liquid. The nano composite probe comprises an MOF material and nano particles loaded on the MOF material, the nano particles comprise carboxyl-modified up-conversion nano particles and nucleic acid aptamers covalently connected with the up-conversion nano particles through amido bonds, and the up-conversion nano particles contain a thulium element and an erbium element. The nano fluorescent probe has the advantages of high specificity, simplicity and rapidness in operation, high sensitivity, high interference resistance, simple preparation process and low cost, provides an efficient solution for rapid detection of liquid microcystin pollution, and has a remarkable market prospect.

The invention relates to the technical field of laser crystals, in particular to a growth method of a thulium-doped yttrium aluminate laser crystal. The growth method specifically comprises the following steps: taking Y2O3 powder, Al2O3 powder and Tm2O3 powder as initial raw materials, taking a pure YAP crystal as a seed crystal, and growing the laser crystal by utilizing an edge-defined film-fed growth method, in the growth process of the laser crystal, adding a raw material with the same proportion as the initial raw material into the melt by using a material adding system, and keeping the liquid level of the melt unchanged and the Tm ion concentration in the melt unchanged; the Tm ion concentration in the melt is 0.5-3 at%; the growth speed of the laser crystal is 0.3 to 10 mm / h; the adding speed of the additive is 0.16 to 5.4 g / h. According to the invention, the Tm: YAP laser crystal is grown by using the continuous addition material edge-defined film-fed crystal growth method, and the optical uniformity of the grown laser crystal is obviously improved, so that the laser crystal is grown by using the edge-defined film-fed crystal growth method.

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

An optical amplifying device based upon the use of Tm-doped optical fiber is proposed, and particularly configured to provide amplification of input signals operating in the wavelength range of 1700-1800 nm. A section of Tm-doped fiber less than a meter is used to provide amplification in the proposed wavelength range, and the amplifying device is specifically configured to direct unabsorbed pump energy away from the main signal path of the amplifying device, preventing damage to and / or degradations in the performance of the amplifying device.

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.

The application relates to the field of optical information technology, and particularly relates to a high-energy thulium-doped fiber laser based on self-locking mode and dispersion management technology, wherein a pump laser is connected with one end of a pump protector, the other end of the pump protector is connected with an a end of a wavelength division multiplexer, a b end and a c end of the wavelength division multiplexer are respectively connected with an i end of a three-port circulator and one end of a thulium-doped gain fiber, the other end of the thulium-doped gain fiber is connected with a d end of an optical coupler, an e end of the optical coupler is connected with one end of a polarization controller, the other end of the polarization controller is connected with one end of a single-mode optical fiber, the other end of the single-mode optical fiber is connected with a g end of the three-port circulator, an h end of the three-port circulator is connected with one end of a collimator, and the other end of the collimator is provided with a dispersion compensation assembly, high-energy ultrashort pulses can be generated, the structure is optimized, and the manufacturing cost is reduced.

The present invention provides a high-peak tunable thulium-doped fiber laser system based on supercapacitor energy supply, which involves the use of stimulated emission modulation technology. It intelligently selects the most suitable laser output mode according to the hardness of the stone and the blood oxygen status of the tissue; and automatically switches to the thulium laser continuous wave hemostasis mode when the hemoglobin deoxygenation ratio and tissue temperature rise exceed the standard to ensure surgical safety; secondly, combined with supercapacitor energy supply technology, the system has high-peak and low-latency energy release capabilities, significantly improving the lithotripsy efficiency. At the same time, through a closed-loop control mechanism, the laser parameters are fine-tuned in real time to avoid the "flash" phenomenon and reduce surgical risks.

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 invention discloses a high-energy and short-period mode-locked pulse fiber laser and an emission method, and relates to the technical field of lasers, the high-energy and short-period mode-locked pulse fiber laser comprises a high-power isolator, and an erbium-doped mode-locked fiber laser and a thulium-doped fiber amplifier which are respectively arranged at two sides of the high-power isolator, the erbium-doped mode-locked fiber laser is connected with the high-power isolator through a high-nonlinearity optical fiber, the thulium-doped fiber amplifier comprises a first signal pumping beam combiner, a second signal pumping beam combiner, a first pumping source and a second pumping source, the first signal pumping beam combiner is connected with the second signal pumping beam combiner through a thulium-doped optical fiber, and the second pumping source is connected with the erbium-doped mode-locked fiber laser through a thulium-doped optical fiber. The erbium-doped mode-locked fiber laser, the high-power isolator, the first signal pumping beam combiner and the second signal pumping beam combiner are arranged on the same straight line, so that the ultra-wide spectrum is provided, the structure of the laser is simplified, amplification of specific wavelengths with few periods and high energy is realized, diversified application requirements are met, and the application range is widened. And the flexibility and multifunctionality of the laser are improved.

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 invention provides a multi-wavelength laser therapy apparatus based on dual wavelengths and four laser modes and an optimization method of the multi-wavelength laser therapy apparatus, and relates to the technical field of laser therapy. Self-adaptive optimal matching of thulium-doped ion concentration and optical fiber length in four laser modes is realized, the machine adjusting time is shortened from several hours to several minutes, and a second-level one-key switching mode in an operation process is supported; the high-peak thulium-doped fiber laser pulse output is realized at the same time, the pulse width at a smaller microsecond level is realized, the peak value and the pulse width of the output pulse are closer to those of the existing solid holmium laser, the lithotripsy efficiency is improved, particularly, the effect on soft and hard stones is realized, the whole machine conversion efficiency is improved, the operation stability is improved, and the safe and reliable treatment purpose is achieved.