641 results about "Pulse energy" patented technology

The invention belongs to but not limited to the technical field of blind hole machining, and discloses a process method and system for laser composite efficient precision machining of blind holes, and the process method comprises a laser hole prefabricating stage and a laser fine hole repairing stage; a hole is preformed in the punching position of a workpiece through a large-pulse-energy laser beam, and fixed-point materials of the workpiece are rapidly removed; and then the hole is finely trimmed through ultra-short pulse width laser, the incident angle direction of a laser beam and the surface of the material is changed through a rotary cutting system, the hole wall and the hole bottom of the hole after the pre-hole stage are trimmed, fine trimming of the blind hole is completed, and the high-precision blind hole with the controllable taper is obtained. The method comprises the following steps: quickly removing a prefabricated blind hole in a workpiece material by using large pulse energy laser; adjusting process parameters, and quickly pre-processing a blind hole with a certain depth in a workpiece; and then the hole wall and the hole bottom of the blind hole are trimmed through high-speed rotating light beams and variable light beam incidence angles of the rotary cutting system, smooth hole wall, flat hole bottom and controllable taper of the blind hole are achieved, and the machining quality and efficiency of the blind hole of the difficult-to-machine material are improved.

The invention discloses an optical element surface measuring device and method. The device comprises a light source module, a motion table, a laser energy monitoring module, a photoelectric detection module, a space triangular focus positioning module, a projection module, a binocular vision module and a processing module. According to the technical scheme, the laser energy monitoring module records laser pulse energy in real time, the photoelectric detection module accurately measures the radius of a focusing light spot, the space triangular focus positioning module accurately positions the focus position, and the projection module projects interference fringes of a periodic structure to the surface of the optical element to be measured. The binocular vision module is used for capturing interference fringe changes, and micro-deformation or damage is judged by combining a phase shift and unwrapping algorithm, so that three-dimensional reconstruction of the micro-deformation and damage morphology of the surface of the optical element is realized. The real-time online measurement of the micro-deformation and the damage threshold of the optical element is realized, and the damage threshold evaluation process is optimized. The method has the advantages of high precision, high real-time performance, high automation degree, wide application range and the like.

The invention provides a laser surface treatment method, device and equipment based on visual control, and the method comprises the steps: carrying out the energy waveform capture processing of pulse laser outputted by laser marking equipment, and carrying out the multi-channel visual detection of a surface reflection region of a to-be-marked part based on a pulse energy reference, and obtaining the surface feature information; planning an initial scanning path according to the surface feature information, and synchronously correcting a trigger time sequence of the pulse laser to obtain a target marking path; and in combination with the target marking path and the pulse energy reference, dynamic observation and local heat dispersion treatment are conducted on the marking area, and the treated part surface is obtained. The method is suitable for performing fine marking on a high-reflectivity or complex geometric surface, and can perform timely adjustment according to local temperature rise or optical characteristic change in the marking process to reduce depth unevenness and thermal damage.

The invention discloses a laser coaxial beam combining system for improving the repetition frequency of laser pulses, which comprises p polarization pulse lasers, a pulse time sequence controller and n stages of beam combining devices, each stage of beam combining device comprises an s polarization pulse laser, a polarization beam combiner and an electro-optical Q switch, and n is a non-negative integer and is greater than or equal to 1. The invention has the following advantages: a plurality of beams of laser in different polarization states can be combined, the pulse repetition frequency and the output average power of the laser are improved, the optimal pulse energy and peak power are maintained, and coaxial output of pulses in the same polarization state is realized.

The invention belongs to the technical field of photoelectronics, and particularly relates to a wide-spectrum narrow-linewidth semiconductor mode-locked laser, and the collaboration of a saturable absorption region SA and a resonator is reflected in time domain-frequency domain dual optimization. And the resonator optimizes the frequency domain characteristics through nonlinear broadening, phase synchronization and mode purification. The SA adjusts a mode locking threshold value in real time through dynamic bias voltage, the pulse energy stability is ensured, dispersion management of the resonator balances the SPM and group velocity dispersion, spectrum splitting is avoided, and the dissipative soliton form is maintained. Besides, due to heterogeneous integration of the InP-based SA and the SiN-based resonator, wafer bonding of the InP-based SA and the SiN-based resonator is realized, high-efficiency energy transfer is realized through the low-loss conical waveguide, a high-performance frequency comb with a wide spectrum and a narrow pulse width is output, and the high-performance frequency comb can be widely applied to the fields of ultrafast optics, coherent light communication and precision spectroscopy.

The invention discloses a wavelength-adjustable high-power picosecond all-solid-state laser. The microchip seed source adopts a passive Q-switching principle, can directly generate laser with the pulse width as narrow as 300ps, is high in seed laser efficiency, good in beam quality and large in energy, can synchronously output TTL (transistor-transistor logic) level, and is used for controlling the pulse duration and delay of a 808nm QCW pumping source; the optical isolator protects the front-stage microchip solid laser from being damaged by returned light of the rear-stage amplifier; the single-rod two-way end pump amplifier amplifies laser pulse energy output by the microchip solid laser; the light beam shaper comprises a Galileo laser beam shrinking system and a soft edge diaphragm and is used for shaping light beams; the single-rod one-way end pump amplifier amplifies the pulse energy of the preceding-stage laser; and the frequency multiplier performs frequency conversion on the output laser, and outputs wavelength-adjustable picosecond laser with millifocus magnitude, high power and high beam quality.

The invention discloses a single crystal turbine blade crystal orientation defect detection system based on adaptive optics, particularly relates to the field of nondestructive testing, and is used for solving the problem that thermal damage and signal consistency are difficult to consider in acoustic imaging of complex structural parts. Through partition energy threshold setting, dynamic pulse planning, photoacoustic processing and unified coordinate cross-subarea data synthesis, local thermal damage caused by excessive concentration of energy is effectively avoided in the material detection process, and the requirement for collecting high-bandwidth signals can be met in a large range. The signal-to-noise ratio and the detection efficiency are improved by regulating and controlling pulse energy and a scanning path, the amplitude comparability and the image coherence among regions are ensured through signal normalization correction and subregion image set splicing, high-resolution and comprehensive-coverage acoustic mapping is output, the crystal orientation defects of the single crystal turbine blade are positioned and evaluated, the detection precision is improved, the measurement period is shortened, and the method is suitable for large-scale popularization and application. And the method has an applicable value for aero-engine parts requiring rapid and high-precision nondestructive detection.

The invention relates to a semiconductor wafer generation method, which comprises the following steps of: firstly, setting laser scanning times, and then respectively setting a scanning path and a dot spacing of each laser scanning; determining a laser scanning speed and a laser pulse repetition frequency based on a calculation rule preset for each laser scanning, and determining a corresponding modified point diameter, laser pulse energy and an offset distance of a laser focus relative to a preset stripping surface; the pulse laser is focused on a preset stripping surface in the crystal ingot or below the preset stripping surface, and n times of laser scanning are carried out, so that modified points and cracks are sequentially formed on the preset stripping surface; and stripping the crystal ingot along the preset stripping surface to obtain a wafer and a residual crystal ingot. The method not only can eliminate burrs at the edge of the wafer, but also can further reduce the material loss of laser stripping, and has the advantages of simple process conditions, good modified layer morphology, low wafer stripping difficulty and suitability for large-scale industrial application.

The invention relates to the technical field of solar heat utilization, and discloses an electric energy conversion and power regulation and control method based on a solar heat exchange coupling system, which comprises the following steps: calculating the phase change latent heat release rate and pressure and temperature sensitivity of a working medium in real time through a nonlinear prediction model, and establishing a compensation factor to dynamically correct the fusion weight of temperature and pressure signals; the shape memory alloy runner is driven to adjust the branch angle in a self-adaptive mode within the range of 45-75 degrees; constructing an energy potential matching matrix of the temperature gradient of the heat storage module and the output voltage of the power generation system, and combining a pulse type energy release strategy to maintain power stability; and controlling adjacent flow channel branches to generate a phase difference based on pressure fluctuation spectrum characteristics to realize fluctuation offset. According to the method, through closed-loop control of thermodynamic parameter compensation and flow channel dynamic adjustment and space-time collaborative optimization of energy potential matching and pulse release, continuous and stable power generation under the intermittent irradiation condition is achieved, the overall energy efficiency of the system is improved, and operation is more stable.

The invention relates to the technical field of laser control, and discloses a 920nm femtosecond pulse fiber laser system based on a neodymium-doped fiber. The system comprises a seed laser source system, a pre-chirp system, an amplification system and a compression system, the output end of the seed laser source system is connected with the input end of the pre-chirp system, the output end of the pre-chirp system is connected with the input end of the amplification system, and the output end of the amplification system is connected with the input end of the compression system. Through a pre-chirp management method, the seed pulse can simultaneously realize the improvement of the pulse energy and the violent broadening of the spectrum in the amplification process. And a wider spectrum can obtain a narrower pulse width after being subjected to time domain compression. The narrower the width of the pulse means that the energy is more concentrated, so that the peak power of the laser pulse output after compression is higher, and the problem that narrow pulse width and high energy output cannot be simultaneously realized in the 920nm wave band in the existing fiber laser technology is solved.

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 laser doping method and application, and belongs to the technical field of new energy batteries. The laser doping method comprises the following steps that S1, a printing procedure is conducted, specifically, slurry containing doping elements is printed on the front face and / or the back face of a semiconductor substrate and dried, a printing area comprises an area A and an area B from inside to outside, and a doping area is covered with the area A; s2, a laser doping process: carrying out laser doping on the area A of the printing area; the power of the laser is P1, and the frequency of the laser is f1; s3, a laser removal process: carrying out laser removal on a region B containing the printing region, wherein the power of the laser is P2, and the frequency of the laser is f2; wherein the monopulse energy E2 is smaller than E1 (E = P / f); and S4, a cleaning process. The laser doping method is applied to preparation of solar cells. According to the method, the time consumption and the use amount of chemical reagents used in the cleaning procedure can be reduced, the production cost is reduced, and the technical problem of environmental pollution is solved.

Systems and methods for detecting multiple events during nuclear imaging scans, and for reconstructing images based on the detected events, are disclosed. In some embodiments, an image scanning system scans a subject, and generates a signal characterizing a detection event. The system generates sampled data based on sampling the at least one signal. Further, the system applies a trained machine learning process to the sampled data. Based on the application of the trained machine learning process, the system generates pulse data characterizing a plurality of decoupled pulses. For example, the pulse data may characterize pulse energy values of each of the decoupled pulses, and corresponding times for each of the pulses. Further, the method includes transmitting the pulse data to generate time-coincident pairs for image reconstruction.

The invention provides an optical system for generating higher harmonics and a method for improving the efficiency of the higher harmonics. The system comprises a femtosecond laser light source, a pulse width compression module and a higher harmonic generation module. The femtosecond laser light source outputs femtosecond laser, the pulse width compression module compresses the pulse width of the femtosecond laser, the pulse width of the femtosecond laser in multi-period magnitude is compressed at least in the period magnitude, the atomic monatomic effect is enhanced, and the higher harmonic generation efficiency is improved. The higher harmonic generation module comprises a vacuum chamber and a first optical fiber structure in the vacuum chamber, and first gas is introduced into optical fibers. The femtosecond laser after pulse width compression is coupled into the first optical fiber structure and interacts with the first gas, and high-efficiency higher harmonics are output. By optimizing the structure of the first optical fiber and related parameters of the first gas, the generation efficiency of higher harmonics can be improved. Moreover, the higher harmonic efficiency is improved, so that the requirement on femtosecond laser pulse energy can be reduced, and the selection range of the output wavelength, the pulse width and the repetition frequency of the femtosecond laser light source is widened.

The invention discloses an ultrafast electron diffraction system based on 300kV direct current acceleration and radio frequency compression and a diffraction imaging method, and solves the problems that the time resolution of the current keV ultrafast electron diffraction system is insufficient due to the space charge effect, and the time-varying electric field generated by a radio frequency compression cavity is used for carrying out time compression on the beam bunch length of an electronic pulse; and the electronic pulse energy is low. According to the invention, femtosecond laser is split, one beam of light generates an ultrafast electronic pulse by using an ultrafast electron generation module based on 300kV direct current acceleration, the energy of the ultrafast electronic pulse is relatively high, and then the pulse width of the ultrafast electronic pulse is compressed by using a radio frequency compression module; the pulse broadening caused by the space charge effect of the ultrafast electronic pulse is effectively inhibited, the time resolution below hundred femtoseconds can be realized, meanwhile, the charge quantity of a single beam of ultrafast electronic pulse reaches 16fC (105e-), and the method can be used for ultrafast kinetic research of irreversible materials.

The invention provides a laser wind finding radar device and an adjusting method. The laser wind finding radar device can adaptively adjust emitted laser pulse energy according to the carrier-to-noise ratio of an echo signal to complete wind speed measurement. On one hand, under the condition of weak back scattering echo signals caused by thin aerosol signals in good weather or severe attenuation of laser pulse energy along with distance propagation caused by sharp increase of atmospheric extinction coefficient in severe weather, the emitted laser pulse energy can be adaptively improved, and the detection capability of the laser wind finding radar is improved; on the other hand, the energy of emitted laser pulses can be properly reduced under the high-quality working condition, the detection capacity of the radar is guaranteed, meanwhile, the assembly loss is reduced, the service life of the radar is prolonged, the overall power consumption is reduced, and the good self-adaptive adjustment capacity is achieved.

This patent application describes arrangements for the energy control of rapidly recurring pulses. The core concept involves the use of a main oscillator emitting a beam with wavelength λ1 and an associated modulation arrangement, an auxiliary oscillator emitting a beam with a different wavelength λ2 and an associated modulation arrangement, and an optical arrangement for coaxial superposition of the beams from the main oscillator and the auxiliary oscillator. Furthermore, an amplifier is used whose amplification medium amplifies both the beam from the main oscillator with wavelength λ1 and the beam from the auxiliary oscillator with wavelength λ2. The amplifier increases the power and pulse energy of the superimposed beam.Furthermore, a spectral filter is used to separate the amplified beam of the main oscillator with wavelength λ1 and the amplified beam of the auxiliary oscillator with wavelength λ2. The spectral filter can be formed, for example, by suitable coatings or consist of a birefringent spectral filter. Thus, the amplified beam is split into two partial beams of different wavelengths.

A data generation method performs subtractive manufacturing by irradiating object with pulse energy beam and measures shape after; calculates information related to light penetration depth into object based on shape information before subtractive manufacturing and measured result of shape after subtractive manufacturing; calculates for each irradiation target position based on information related to an inclination at each irradiation target position of object that is irradiated with pulse energy beam with respect to an irradiation direction of the pulse energy beam and the information related to light penetration depth, a unit processing amount of object in a case where object is irradiated with pulse energy beam a unit number of times; and calculates, based on a target processing amount for each irradiation target position and the unit processing amount for each irradiation target position, a target number of times which each irradiation target position is irradiated with the pulse energy beam.

A method for generating ultrawideband pulsed microwave signals from optical field ionization of a gas with an ultrashort laser pulse, where the amplitude and frequency of the signals can be controlled via the characteristics of the laser pulse and / or the gas. The center frequency of the spectrum of the microwave signal can be controlled by changing the laser pulse energy. The amplitude of the microwave signal can be controlled by changing the wavelength of the laser pulses. The amplitude and frequency of the microwave signal can be tuned by controlling the pressure of the gas medium. The location at which the microwave signal is generated can be controlled by controlling the location at which the laser pulse creates a plasma. Interference among microwave signals resulting from multiple laser-produced plasmas can be used to construct an ultrawideband microwave signal having a predetermined amplitude and frequency.

The invention relates to the technical field of micro-electro-mechanical system sensors, in particular to an MEMS pressure sensor which comprises a shell, an induction diaphragm and an ASIC signal processing unit, an induction mounting cavity and a signal processing cavity are formed in the shell, an air inlet is formed in the lower end face of the shell, a detection channel and a buffer cavity are formed in the shell, and the detection channel is communicated with the signal processing cavity. The buffer cavity is designed to be gradually expanded from bottom to top; pulse airflow firstly enters the detection channel through the air inlet, and direct disordered impact of the airflow is avoided; then the airflow enters the buffer cavity, the airflow speed and the pressure peak value are gradually reduced and the pulse energy is dispersed by utilizing the characteristic that the cross sectional area of the cavity is gradually increased, and the originally concentrated strong impact force is converted into gentle pressure transmission, so that the abrasion and damage risks caused by the fact that the sensing diaphragm frequently bears the violent pressure are reduced; the structure stability and the sensing sensitivity of the sensing diaphragm can be maintained, and the accuracy of pressure detection and the reliability of long-term work of the MEMS pressure sensor can be guaranteed.

The invention belongs to the technical field of digital signal processing, and particularly provides a nuclear pulse amplitude extraction method based on parameter identification and a nuclear pulse analysis system, which are used for solving the problem that the precision of an energy spectrum diagram is reduced due to baseline drift of a nuclear pulse signal and pulse accumulation and discarding, so that the energy resolution and the counting rate of the nuclear pulse energy spectrum diagram are improved. According to the method, accurate capture and processing of nuclear pulse signals can be realized, an original sampling sequence signal is processed by using a filtering method, the influence of baseline drift is reduced, parameter identification and amplitude extraction are carried out on stacked pulses processed by a combined filtering method by using a parameter identification model, and a high-precision spectrogram is generated; therefore, the energy resolution and the counting rate of the system are improved, and powerful technical support is provided for the fields of nuclear physics research, nuclear energy application, nuclear radiation detection and the like.

A catheter system (100) for treating a treatment site (106) within or adjacent to a blood vessel (108) includes a power source (124), a light guide (122) and a plasma target (242). In various embodiments, the light guide (122) receives power from the power source (124). The light guide (122) has a distal tip (244), and the light guide (122) emits light energy (243) in a direction away from the distal tip (244). The plasma target (242) is spaced apart from the distal tip (244) of the light guide (122) by a target gap distance (245). The plasma target (242) is configured to receive light energy (243) from the light guide (122) so that a plasma bubble (234) is generated at the plasma target (242). The power source (124) can be a laser and the light guide (122) can be an optical fiber. The catheter system (100) can also an inflatable balloon (104) that encircles the distal tip (244) of the light guide (122). The plasma target (242) can be positioned within the inflatable balloon (104). The plasma target (242) can have a target face (1672) that receives the light energy (243) from the light guide (122). The plasma target (242) can be formed from one or more of tungsten, tantalum, platinum, molybdenum, niobium, iridium, magnesium oxide, beryllium oxide, tungsten carbide, titanium nitride, titanium carbonitride and titanium carbide.

The invention provides a laser therapeutic instrument and a control circuit and method thereof. The laser therapeutic instrument comprises a laser, a microcontroller in communication connection with the laser and an optical shutter motor used for driving an optical shutter of the laser to be opened and closed, the control circuit comprises an on-off module and a driving module, and the on-off module is controlled by a control signal to be turned on or turned off so as to output an on-off signal; the control signal is output by the microcontroller based on the number of preheating laser pulses, the opening time of the optical shutter and the state of the laser; the driving module is used for configuring the voltage of an optical shutter motor control signal according to the turn-on or turn-off of the on-off module, and the optical shutter motor control signal is used for turning on or turning off the optical shutter motor. The laser shutter can be opened after the laser is preheated, so that the laser pulse emitted into the dot matrix scanning handle is uniform and stable, and the consistency of laser pulse energy in the treatment process is ensured.

A method of laser bonding glass to metal foil includes contacting a first glass substrate with a first metal foil to create a first contact location; directing a laser beam on the first contact location to bond the first glass substrate to the first metal foil; contacting a second glass substrate with a second metal foil to create a second contact location; and directing the laser beam on the second contact location to bond the second glass substrate to the second metal foil, wherein the first metal foil and the second metal foil each have a thickness from 5 μm to 100 μm, and wherein the laser beam comprises a pulsed laser comprising: a pulse energy from 2.8 μJ to 1000 μJ; and a wavelength such that the first and second glass substrates are substantially transparent to the wavelength.

The invention discloses an electromagnetic pulse simulation method and device, electronic equipment and a storage medium, and relates to the technical field of electromagnetic pulse simulation. The pulse compression loop module is used for performing sharpening treatment to form a double-exponential waveform conforming to high-altitude electromagnetic pulse characteristics, and meanwhile, an upper polar plate and a lower polar plate of the transmission line structure module are used for converting pulse energy into a bounded wave radiation field so as to simulate the coupling effect of the high-altitude electromagnetic pulse on ground equipment; and finally, a PoE port effect experiment module is injected to evaluate the response characteristic, the damage mechanism and the system-level failure behavior, so that the problems of insufficient waveform reproduction precision, huge system size and difficulty in deployment caused by the adoption of a traditional Marx generator and a modular splicing structure in an existing high-altitude electromagnetic pulse simulation method can be solved; the technical effect of improving experiment repeatability and protection design accuracy is achieved.

The invention relates to the field of ultrafast laser, and discloses a nonlinear femtosecond pulse energy self-stabilizing device. Comprising a nonlinear self-phase modulation module, a reflector, a grating, a lens and a filter which are arranged in sequence, and the nonlinear self-phase modulation module, the reflector, the grating, the lens and the filter form a light beam transmission path; the nonlinear self-phase modulation module comprises a conical lens, a low-dispersion lens and a nonlinear medium; the reflecting mirrors are reflecting mirrors with consistent reflection spectrums; the grating is used for expanding a spectrum carrying energy fluctuation information in a spatial domain to form frequency domain spatial distribution related to energy; the lens is used for focusing or collimating the light beam expanded by the grating; the filter is a liquid crystal filter and is used for dynamically setting a filtering range; abnormal disturbance in the light path is identified by using the generative adversarial network, and a compensation strategy is generated; the abnormal disturbance comprises sudden mechanical vibration and nonlinear coefficient mutation at the initial stage of medium damage.

A mid-infrared laser generating system based on dispersion regulation and control soliton group pulses can obtain high-power, high-efficiency and high-proportion mid-infrared laser output, and has the advantages of being all-fiber, compact in structure and high in mid-infrared rear spectrum power proportion. The pulse fiber laser generates nanosecond pulse laser in a 1.5-micron wave band; the optical fiber pulse stretcher is a single-mode quartz optical fiber, the nanosecond pulse is split into a plurality of ultrafast soliton pulses through a nonlinear effect, and spectral energy conversion from 1.5 microns to 2.4 microns is carried out; the fiber laser amplifier further improves the output power of the broadened pulse laser, expands the spectrum to a 2.7-micron wave band, and improves the pulse energy after the 2.3-micron wave band; the optical fiber mode field adapter efficiently couples the pulse generated in the optical fiber laser amplifier into the nonlinear optical fiber; the nonlinear optical fiber expands the laser to a mid-infrared 3-5 micron wave band, and mid-infrared laser output with high power, high efficiency and high proportion is obtained.

The present invention relates to a method for generating a semiconductor wafer, comprising the following steps: first, setting a number of times to perform laser scanning, then setting a scanning path and a point spacing for each instance of laser scanning; based on a preset calculation rule for each instance of laser scanning, determining a laser scanning speed and a laser pulse repetition frequency, and determining a corresponding modified spot diameter, a laser pulse energy and an offset distance of the laser focal point relative to a preset stripping surface; focusing a pulse laser on the preset stripping surface or below the preset stripping surface in a crystal ingot, and performing a number n of instances of laser scanning, so as to sequentially form a modified spot and a crack on the preset stripping surface; and stripping the crystal ingot along the preset stripping surface, to obtain a wafer and a remaining crystal ingot. The present invention can not only eliminate burrs on the edge of a wafer, but can also reduce material loss during laser stripping. The method has the advantages of simple process requirements, good modification layer morphology and low wafer stripping difficulty, and is suitable for large-scale industrial application.

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.

A catheter system (100) for treating a treatment site (106) within or adjacent to a blood vessel (108) includes a power source (124), a light guide (122) and a plasma target (242). In various embodiments, the light guide (122) receives power from the power source (124). The light guide (122) has a distal tip (244), and the light guide (122) emits light energy (243) in a direction away from the distal tip (244). The plasma target (242) is spaced apart from the distal tip (244) of the light guide (122) by a target gap distance (245). The plasma target (242) is configured to receive light energy (243) from the light guide (122) so that a plasma bubble (234) is generated at the plasma target (242). The power source (124) can be a laser and the light guide (122) can be an optical fiber. The catheter system (100) can also an inflatable balloon (104) that encircles the distal tip (244) of the light guide (122). The plasma target (242) can be positioned within the inflatable balloon (104). The plasma target (242) can have a target face (1672) that receives the light energy (243) from the light guide (122). The plasma target (242) can be formed from one or more of tungsten, tantalum, platinum, molybdenum, niobium, iridium, magnesium oxide, beryllium oxide, tungsten carbide, titanium nitride, titanium carbonitride and titanium carbide.