2173results about "Active medium shape and construction" patented technology

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 narrow pulse generation system and method of an FPGA integrated fiber laser, and belongs to the field of all-digital fiber laser control. The narrow pulse generation system comprises a multi-phase clock generation module, a dynamic delay chain module, a pulse width search module, a signal selection module, a logic operation module, a frequency control module, a self-calibration module and an LVDS driving module which are in synergistic effect. The multi-phase clock generation module is used for realizing rough delay adjustment of nanosecond stepping; the dynamic delay chain module is used for realizing fine delay adjustment of picosecond stepping; therefore, based on the FPGA integrated design, an external delay chip and a high-frequency peripheral circuit are not needed, the hardware complexity and cost are reduced, and the anti-interference capability is high; picosecond-level stepping pulse width adjustment is realized through a two-level structure of nanosecond-level coarse adjustment and picosecond-level fine adjustment, and the limitation of a traditional FPGA (Field Programmable Gate Array) integration scheme is broken through; time delay deviation caused by environment change and hardware drift is considered, temperature compensation and TDC calibration are carried out, and the stability of pulse width is ensured.

The invention relates to the technical field of laser control, in particular to an intelligent control method and system of an MOPA laser. The method comprises the following steps: constructing a target training data set and a one-dimensional convolutional neural network model; training a one-dimensional convolutional neural network model based on the target training data set in combination with a target loss function and a back propagation algorithm to obtain a target model; acquiring current operation parameters of the MOPA laser; inputting the current operation parameters into a target model, and outputting target regulation and control parameters by the target model; the target regulation and control parameters comprise the working current of a pumping module in the MOPA laser and the working temperature of a doped fiber; based on the target regulation and control parameters, the working current of a pumping module in the MOPA laser and the working temperature of a doped optical fiber are adjusted, the working temperature of the doped optical fiber comprises a plurality of different target temperatures, and each target temperature corresponds to a different position on the doped optical fiber. In this way, the problems caused by the nonlinear effect generated under high-power pumping can be reduced.

The invention discloses a high-power picosecond pulse train laser with programmable sub-pulse energy and a method, and relates to the related technical field of lasers, the high-power picosecond pulse train laser comprises a mode-locked fiber laser, an acousto-optic modulator and a solid amplification chain which are sequentially arranged along an optical transmission path; the mode-locked fiber laser generates a mode-locked picosecond pulse sequence; the acousto-optic modulator performs pulse selection and pulse string grouping on the mode-locked picosecond pulse sequence, and performs pre-programming shaping on sub-pulse energy in a pulse string according to set intensity distribution to generate a pre-shaped pulse string; the solid amplification chain comprises at least one stage of solid amplifier, and the solid amplifier comprises a dichroscope, a laser gain crystal, a coupling optical assembly and an LD pumping source; and the dichroscope is used for focusing the pre-shaped pulse string amplified at the previous stage and the LD pump light transmitted by the coupling optical assembly into the laser gain crystal. Independent programmable regulation and control of the energy of each sub-pulse in the pulse string are realized, and the energy distribution of each sub-pulse in the pulse string can be flexibly adjusted.

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

The invention relates to the technical field of laser data transmission, and provides a multi-dispersion laser system and a control method thereof. The control method of the multi-dispersion laser system comprises the following steps: establishing a first model and a second model; in the initial state, the pumping power of the pumping light source is adjusted, and a first target pulse interval and first target power are determined in combination with the first attenuation coefficient, the second attenuation coefficient and the first model; determining a second target power, a second target pulse interval and a target attenuation coefficient by a second model in combination with the fact that the second attenuation coefficient is zero; the real-time pumping power is controlled to be first target power, the first real-time attenuation coefficient is zero, the second real-time attenuation coefficient is zero, the first laser is output in a first state, and the second laser is output in a third state; the third state comprises a soliton dissipation state; the real-time pumping power is controlled to be second target power, the first real-time attenuation coefficient is the target attenuation coefficient, the second real-time attenuation coefficient is zero, the first laser is output in the first state, and the second laser is output in the second state.

The invention discloses a high-efficiency erbium-ytterbium co-doped fiber laser for long-wavelength peak shifting pumping. The laser is characterized in that pump light enters an active fiber through a pump coupling device; the active optical fiber is doped with erbium ions and ytterbium ions, part of the pump light entering the active optical fiber is absorbed by the ytterbium ions, and part of the pump light entering the active optical fiber is absorbed by the erbium ions; ytterbium ions are transited from a ground state 2F7 / 2 to an excited state 2F5 / 2 energy level, cross relaxation occurs between the ytterbium ions and ground state erbium ions nearby the ytterbium ions, energy is transferred to the erbium ions, and the erbium ions are relaxed to a 4I13 / 2 energy level after transition from 4I15 / 2 to 4I11 / 2 is completed; erbium ions absorb pump light, transition from a ground state 4I15 / 2 to a 4I11 / 2 energy level and then relaxation to a 4I13 / 2 energy level are carried out, the erbium ions of the 4I13 / 2 energy level generate laser gain of 1.5 microns, and when the gain exceeds loss of a laser resonant cavity formed by the first resonant cavity feedback device and the second resonant cavity feedback device, 1.5 microns-band laser oscillation is formed and is output through the second resonant cavity feedback device. The influence of amplified spontaneous emission of ytterbium ions and excited state absorption of erbium ions on the efficiency of the laser is weakened, and the efficiency of the laser is improved.

The invention discloses a green laser and a laser welding machine. The green laser comprises a pumping source, a first reflector, a laser crystal, a polarization beam splitter, a second reflector, a frequency doubling crystal, a telescope lens group and a spectroscope; the pumping source provides pulse pumping light; the laser crystal absorbs the pulse pump light to generate fundamental frequency laser in an infrared band, the fundamental frequency laser enters the polarization beam splitter and is split into P polarized light and S polarized light, the P polarized light is transmitted out of the resonant cavity, and the S polarized light is transmitted in the resonant cavity; and the telescope lens group converges the fundamental frequency laser to the frequency doubling crystal to generate frequency doubling laser of a green light wave band, and the frequency doubling laser is transmitted by the spectroscope and then is output. The green laser is used for spot welding of high-reflection materials such as copper and aluminum, the maximum single pulse energy can reach 5 J, the maximum peak power is 2 kW, the pulse width ranges from 0.05 ms to 5 ms, the problem of low absorption of the high-reflection materials to laser in the 1-micron wave band is solved, and the green laser is an edge tool for precise spot welding of the high-reflection materials.

A grain-oriented electrical steel sheet according to an embodiment of the present disclosure includes: an electrical steel sheet substrate, and an insulating coating layer disposed on the electrical steel sheet substrate, wherein at least one linear deformed portion is disposed on a surface of the insulating coating layer, a re-solidification layer is formed on a position of one of front and rear boundaries of the deformed portion, and P-concentration in the re-solidification layer is lower than P-concentration of a lower insulating coating layer on which a re-solidification layer is not formed in a thickness direction of the insulating coating layer.

This application relates to the field of laser technology and provides an integrated fiber coupling device and apparatus. The device includes a beam combining module and a coupling filter module integrated within a housing. The beam combining module polarizes and combines the laser beam, which is then coupled into a fiber combiner via a first fiber and output as a second fiber. The output is then filtered by a cladding filter unit and output through a nozzle. The coupling filter module contains multiple fixed cavities with curved walls. The first fiber at the input end of the fiber combiner and the second fiber at the output end are respectively fixed in curvature by adhering to the corresponding curved walls before output. This device improves beam quality and overall heat dissipation efficiency. The curved wall structure fixes the curvature of the fiber, reducing fiber stress and bending radius, thus solving the problems of excessive bending stress and insecure fiber fixation in existing coupling units, which lead to poor stability and reliability of laser output.

A grain-oriented electrical steel sheet according to an embodiment of the present disclosure includes: an electrical steel sheet substrate; and an insulating film layer that is disposed on the electrical steel sheet substrate. At least one deformation portion having a linear shape is formed on a surface of the electrical steel sheet substrate, and a natural corrosion potential value of the electrical steel sheet is -350 mV or more.

A portable air-cooled fiber laser device disclosed by the present invention comprises a box body, a laser pumping source, a fiber output assembly, a power supply assembly, a heat dissipation engine and a control circuit are integrated in the box body, the power supply assembly adopts a drawable structure, a replaceable battery is arranged in the power supply assembly, and energy supply without an external power supply is realized. The heat dissipation engine is arranged in a sandwich type structure and is composed of a heat dissipation fin set and heat pipes embedded in the heat dissipation fin set, a transverse ventilation heat dissipation channel is formed through a heat dissipation fan, and efficient heat management is achieved. Connection with a mobile terminal or computer equipment in a wired or wireless mode is supported, and remote control over the operation state of the laser is achieved. The device is compact in structure, efficient in heat dissipation and convenient to carry, has good heat dissipation performance, independent power supply capacity and environmental adaptability, is suitable for application scenes such as multi-scene field operation and emergency use, and has good practicability and popularization value.

A high-power single-frequency laser amplifier based on prepared YAG derivative optical fibers comprises a single-frequency optical fiber laser seed source, the output end of the single-frequency optical fiber laser seed source is connected with the input end of a first-stage pre-amplifier, and the output end of the first-stage pre-amplifier is connected with the input end of a second-stage pre-amplifier. The output end of the secondary preamplifier is connected with the input end of the high-power double-cladding circulator, and the output end of the high-power double-cladding circulator is connected with a signal light input port of the high-power pumping signal beam combiner. The output end of the high-power pumping signal beam combiner is connected with one end of a specially prepared large-mode-field low-NA double-cladding rare earth doped YAG derivative optical fiber, and the other end of the large-mode-field low-NA double-cladding rare earth doped YAG derivative optical fiber is connected with the input end of the cladding light filter. The problem that expansion and diffusion of a fiber core in the YAG derived optical fiber are not controlled is solved, and therefore the theoretical power limit of single-frequency optical fiber laser amplification conducted through a silica optical fiber at present is broken through.

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

The invention provides a 1.6-2.1 [mu] m full-band single-frequency Tm < 3 + >-doped germanosilicate composite fiber laser, which comprises a fiber short linear cavity (2) which forms a distributed Bragg reflection cavity through a Tm < 3 + >-doped germanosilicate composite fiber, a broadband fiber bragg grating and a narrowband fiber bragg grating, or the Tm < 3 + >-doped germanosilicate composite optical fiber inscribes the phase shift grating to form a distributed feedback cavity, Tm2O3 with the concentration smaller than or equal to 0.5 mol% and GeO2 with the concentration larger than or equal to 20 mol% are doped into one area of a fiber core of the Tm < 3 + >-doped germanosilicate composite optical fiber at the same time, and Tm2O3 with the concentration larger than or equal to 1 mol% and GeO2 with the concentration smaller than or equal to 10 mol% are doped into the other area of the fiber core of the Tm < 3 + >-doped germanosilicate composite optical fiber at the same time. According to the optical fiber laser, a full-wave-band single-frequency laser with the working wavelength covering 1.6-2.1 microns, the power larger than 100 mW and the line width smaller than 2 kHz can be obtained.

The invention relates to the technical field of semiconductor lasers, and particularly provides a tunable narrow-linewidth multi-wavelength laser based on injection locking, which comprises a light source, an optical splitter, a coupler, a photoacoustic frequency shifter and a micro-ring, the optical path of each sub-beam is provided with a photoacoustic frequency shifter and a micro-ring, the photoacoustic frequency shifters are responsible for adjusting the frequency of the sub-beams, the micro-rings and a light source form an injection locking relation and compress the line width of the sub-beams, then all the sub-beams are combined through a coupler, and finally power amplification is conducted through a semiconductor optical amplifier. Through the optical splitter, the photoacoustic frequency shifter and the micro-ring, the single light source system outputs equally-spaced multi-wavelength laser, and the defects of a traditional multi-light-source design are overcome.

A first pumping source and a second pumping source are combined through a pumping beam combiner and are coupled into an erbium-doped fluoride fiber and a high-reflectivity fiber bragg grating, and the erbium-doped fluoride fiber and a low-reflectivity fiber bragg grating form a laser resonant cavity. The intermediate infrared laser is output through the low-reflectivity fiber bragg grating, the cladding light filter and the optical fiber end cap; the high-reflectivity fiber bragg grating and the low-reflectivity fiber bragg grating have the same grating period, the fourth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4F9 / 2 energy level to the 4I9 / 2 energy level, and the fifth-order harmonic reflection wavelength of the grating is located in the emission spectrum range of transition of erbium ions from the 4I11 / 2 energy level to the 4I13 / 2 energy level; by adjusting the power of the first pumping source and the second pumping source, the net gain of laser transitions from the 4F9 / 2 energy level to the 4I9 / 2 energy level and transitions from the 4I11 / 2 energy level to the 4I13 / 2 energy level is regulated and controlled, and switching of laser working wavelengths is achieved.

The invention discloses an all-fiber structure pulse laser based on a superfine single-crystal fiber and a preparation method thereof. The all-fiber structure pulse laser comprises a gain single-crystal fiber and a pulse modulation single-crystal fiber, and the gain single-crystal fiber and the pulse modulation single-crystal fiber form a superfine single-crystal fiber heterogeneous bonding structure through thermocompression bonding; the gain single-crystal optical fiber serves as a laser gain medium, the pulse modulation single-crystal optical fiber serves as a saturable absorber, the gain single-crystal optical fiber is provided with a high-reflection grating, the high-reflection grating and an oblique-angle low-reflection end arranged at the tail end of the pulse modulation single-crystal optical fiber form a resonant cavity, and pump light is input into the gain single-crystal optical fiber and enters the resonant cavity through the high-reflection grating. And the oblique-angle low-reflection end outputs pulse laser. The gain section and the modulation section are fused into an integrated structure through the superfine single crystal optical fiber bonding technology, the high-reflection grating is inscribed through the femtosecond laser direct writing technology, low-reflection-mirror oblique angle processing is carried out at the output end, space coupling loss is eliminated, and all-optical-fiber monolithic integration is achieved.

The utility model provides a GHz femtosecond pulse laser generating device which comprises a low-frequency femtosecond pulse laser generating assembly and at least two repetition frequency multiplication units. Each repetition frequency multiplication unit comprises a polarization beam splitter, an optical fiber delay line and a polarization beam combiner, input light of the repetition frequency multiplication units is divided into two paths of linearly polarized light through the polarization beam splitters, one path of linearly polarized light directly enters the polarization beam combiners, and the other path of linearly polarized light enters the polarization beam combiners through the optical fiber delay lines; and the two paths of linearly polarized light are output after being subjected to polarization beam combination in the polarization beam splitter. According to the utility model, by adopting an extra-cavity repetition frequency multiplication mode of polarization beam splitting and beam combination, the problems that the femtosecond GHz pulse directly output by the laser is difficult to weld due to too short optical fiber length and the stability of the solid laser is poor are solved, and the problems that the pulse is uneven due to cascade frequency multiplication through a coupler and the power is reduced due to the addition of an attenuator are solved; and low noise, high stability, long service life and all-fiber output of the GHz femtosecond laser are realized.

The invention relates to a high-power light source in the technical field of laser, in particular to a high-power light source for assisting an EYDFA to output a 1.5-micron wave band based on 1-micron wave band signal light, which absorbs untransferred pump light by introducing the signal light in the 1-micron wave band, further inhibits spontaneous radiation amplification of 1-micron wave band ytterbium ions, and improves the output efficiency of the 1-micron wave band ytterbium ions. The wavelength of the selected 1-micron-band signal light is located at the reabsorption wavelength of the EYDFA at the same time, the 1-micron-band signal light absorbing redundant pump light is reabsorbed by the EYDFA, energy is further transferred to erbium ions, and the conversion efficiency and output power of 1.5-micron-band laser are improved.

The invention provides a fiber laser dichroic mirror synthesis control system and method based on multi-dimensional real-time feedback. The method comprises the steps that all light sources output light beams with different wavelengths; each light source corresponds to a multi-dimensional adjustment module, and adjustment of multi-dimensional control parameters of each light beam is realized through the multi-dimensional adjustment module; the synthesis module realizes cascade synthesis of light beams through dichroic mirror arrays which are arranged according to the wavelength gradient of the light beams, outputs combined light beams, monitors the power, light spot morphology, spectrum and pointing data of the combined light beams in real time, and outputs monitoring data; and the feedback controller is used for converting the monitoring data into a multi-dimensional control vector and dynamically adjusting the multi-dimensional adjusting module corresponding to each light source to form multi-dimensional cooperative closed-loop control. According to the invention, the problem of light beam quality degradation caused by environmental disturbance of a traditional dichroic mirror synthesis system is solved, the anti-interference capability of the system is enhanced through multi-degree-of-freedom closed-loop control, modular expansion is supported at the same time, and rapid expansion can be realized when a synthesis laser unit needs to be newly added.

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.

A tunable laser includes: a channel selection assembly, a plurality of optical amplifiers, a micro-ring filtering assembly and a reflection assembly. The micro-ring filtering assembly is coupled to the reflection assembly, and operation wavelength ranges of the respective optical amplifiers are different. The channel selection assembly is used for selecting any optical amplifier to input a gain optical signal to the micro-ring filtering assembly. The micro-ring filtering assembly is used for filtering the gain optical signal under a vernier caliper effect to obtain filtered optical signals, and then inputting same into the reflection assembly. The reflection assembly is used for outputting some of the filtered optical signal outwards, and reflecting, after the remaining optical signals pass through the micro-ring filtering assembly, the remaining optical signals to an optical amplifier currently selected by the channel selection assembly.

Systems and methods of in situ pressure control at an anatomical environment during a procedure are disclosed. An exemplary irrigation and suction system comprises a user input configured to receive from a user a desired pressure to be applied to the anatomical environment, or a desired flow condition corresponding to the desired pressure. The system comprises a pressure sensor to sense a pressure at or near the anatomical environment, and a control module to adjust one or more of an irrigation flow rate or a suction flow rate of at least one working channel of a medical device to maintain the pressure of the anatomical environment at substantially a level of the desired pressure, or to maintain the desired flow condition in the working channel during the procedure.

Systems and methods of in situ unclogging a working channel in a medical device during a procedure are disclosed. An exemplary unclogging system comprises a flow sensor to sense a flow rate through a working channel, and a control module to detect a channel state indicating a presence or absence of clogging based on the flow rate. In the presence of channel clogging, the control module can control one or more of an irrigation source or a suction source to provide respectively irrigation fluid or suction pressure to unclog the obstructed channel. The control module can adjust one or more of an irrigation flow rate or a suction flow rate through the working channel to maintain a desired pressure of the anatomical environment at the anatomical site, or to maintain a desired flow condition in the working channel, during the procedure.

The invention provides an atypical MOPA fiber laser device integration device, system and method. The device comprises an optical resonant cavity, a first device group and a second device group, wherein the first device group comprises a first amplification stage gain optical fiber, a first reverse pumping beam combiner, a first pumping source and a first cladding light stripper, and the second device group comprises a second amplification stage gain optical fiber, a second reverse pumping beam combiner, a second pumping source and a second cladding light stripper; the optical resonant cavity is used for receiving the pump light transmitted by the first amplification stage gain optical fiber and the second amplification stage gain optical fiber, transmitting the pump light which is not absorbed to the second amplification stage gain optical fiber and the first amplification stage gain optical fiber, and generating signal light under the action of the absorbed pump light; and the signal light is transmitted to the first amplification stage gain fiber and the second amplification stage gain fiber in positive and negative directions. The device number and the manufacturing cost are remarkably reduced, the light-to-light conversion efficiency and the system reliability are improved, and meanwhile high-power beam combination and miniaturization integration are facilitated.

The invention relates to a high-power dual-wavelength erbium-doped solid laser, and belongs to the technical field of laser. The high-power dual-wavelength erbium-doped solid laser comprises a pumping source, a pumping cavity, a diamond, a heat sink, a first resonant cavity and a second resonant cavity, the first resonant cavity comprises a first erbium-doped YAG slice crystal, and the second resonant cavity comprises a second erbium-doped YAG slice crystal. The first erbium-doped YAG sheet crystal is used for generating 1.64 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the first resonant cavity; and the second erbium-doped YAG sheet crystal is used for generating 2.94 [mu] m laser which oscillates back and forth in a back-and-forth light path provided by the second resonant cavity. According to the high-power dual-wavelength erbium-doped solid laser provided by the invention, synchronous output of 1.64 mu m and 2.94 mu m dual-wavelength laser is realized, the multifunctionality and medical adaptability of the laser are enhanced, and multi-type treatment requirements of soft tissues and hard tissues can be met at the same time.

The invention discloses a dual-wavelength mode-locked laser generating device and a dual-wavelength mode-locked laser generating method, and belongs to the technical field of optical communication, and the dual-wavelength mode-locked laser generating device comprises a pumping source, an optical integration module, a gain optical fiber, a saturable absorber and a dual-wavelength pulse independent polarization mode linear coupling regulation and control structure, linear coupling strength of cross-polarization components in two wavelength pulses is independently regulated and controlled by using a structure of a polarization controller and a polarization maintaining optical fiber, and dual-wavelength mode-locked pulse laser of different types of pulse combinations can be obtained. The coherent pulse light source with unique spectral characteristics can provide a low-cost light source for the fields of high repetition frequency optical combs, all-fiber architecture high repetition frequency soliton sequences and microwave photonics.

The invention provides an all-polarization-maintaining optical fiber mode-locked laser which comprises a linear cavity and an annular cavity. Wherein the annular cavity consists of a wavelength division multiplexer, an optical fiber coupler, a phase bias device, a gain optical fiber and a dispersion compensation optical fiber; the linear cavity is composed of an optical fiber coupler and an optical fiber reflector. As a function multiplexing device, an external electric field is applied to the phase bias device, so that the functions of continuous tuning of the phase difference in the positive direction and the negative direction in the annular cavity of the 9-shaped cavity mode-locked fiber laser and rapid phase tuning are realized, and the realization of a mode-locked state and a high-precision phase locking state is promoted. In addition, the composition structure of the resonant cavity can be simplified, and the repetition frequency and the system stability of the mode-locked laser can be improved. The technology for constructing the 9-shaped cavity mode-locked fiber laser by adopting the active phase bias device has originality in the field of ultrafast optics, and a better choice is provided for the all-polarization-maintaining fiber mode-locked laser.