366 results about "Nanosecond pulse" patented technology

The invention discloses a photoacoustic spectrum-confocal Raman spectrum multi-view-field high-dimensional imaging method and a photoacoustic spectrum-confocal Raman spectrum multi-view-field high-dimensional imaging device. Nanosecond pulse laser with adjustable wavelength is generated through a continuous spectrum nanosecond pulser and a narrow-band spectrum tuning module and cooperates with a microscopic detection module, a depth imaging module, a galvanometer system and an electric displacement table to obtain spatial three-dimensional data, a photoacoustic spectrum and a Raman spectrum under multiple view fields; shallow photoacoustic spectrum-Raman spectrum tomography and deep three-dimensional photoacoustic imaging are realized; correcting a photoacoustic spectrum quantitative error by using a spectrum decoupling algorithm, and fusing the multi-view-field data to generate multi-view-field high-dimensional photoacoustic spectrum-Raman spectrum data; high-dimensional data features are extracted based on a 3D convolution instance segmentation network, and quantitative analysis and spatial distribution visualization of blood oxygen, inflammatory factors and the like are achieved. According to the method, the limitation that substances are difficult to analyze in photoacoustic imaging is overcome, the contradiction between the imaging resolution and the penetration depth is solved, and an accurate analysis means is provided for diagnosis of diseases such as knee osteoarthritis and sepsis.

The invention discloses a 2 [mu] m nanosecond pulse fiber laser and a time domain waveform adjustment method thereof. The laser comprises a seed source module and an amplification module connected with the seed source module. The seed source module comprises a first high-reflectivity fiber bragg grating, an acoustic optical modulator, a first beam combiner, a first thulium-doped fiber, a 2 * 2 coupler and a second high-reflectivity fiber bragg grating which are connected in sequence, as well as a driving source connected with the acoustic optical modulator and a first pumping source connected with the first beam combiner; the amplification module comprises an online isolator, a second beam combiner, a second thulium-doped optical fiber and an output jumper which are connected in sequence, and a second pumping source connected with the second beam combiner; the rising edge time and the starting time of the acousto-optic modulator are subjected to parameter setting through a human-computer interface of the driving source; the wavelengths of lasers output by the first pumping source and the second pumping source are both 793 nanometers. According to the invention, the multi-peak phenomenon of the Q-switched pulse laser of the 2um waveband can be conveniently and effectively eliminated, the performance of the laser is improved, and the application requirements of low cost and mass production are met.

The invention discloses a pulse discharge eddy current cavitation generator which comprises an eddy current container, and the eddy current container is provided with a liquid inlet pipe allowing liquid to be guided in tangentially. An inlet of the liquid outlet pipe is communicated with the center of the vortex container, and the liquid outlet pipe is provided with an inner diameter decreasing section, a throat part and an inner diameter increasing section which are sequentially arranged from bottom to top; the flow guide part is arranged in the center of the vortex container and is positioned on the lower side of the liquid outlet pipe; from bottom to top, the outer diameter of the flow guide piece is gradually reduced; the flow guide part and the liquid outlet pipe are coaxially arranged; a first electrode is arranged in the liquid outlet pipe, and a second electrode opposite to the first electrode is arranged in the flow guide part; the liquid outlet pipe is provided with an electrode holder for fixing the first electrode; and the liquid outlet pipe body is provided with a liquid outlet. The vortex hydrodynamic cavitation generator and the nanosecond pulse device are combined in the same device, so that the energy consumption of the device is reduced, the discharge efficiency and the organic matter degradation efficiency are improved, and the space is saved.

Disclosed is a detection device for laser spot welding micro-weld spot quality based on laser ultrasound, comprising: a nanosecond pulsed laser configured to emit a laser; a half-wave plate configured to generate a phase difference of the laser; a scanning galvanometer configured to focus the laser as a point source and excite an ultrasonic wave on a surface of a sample; a multi-axis displacement platform configured to place and / or move the sample; a laser Doppler vibrometer configured to emit a probe light; an image sensor configured to acquire image data of the sample in a plurality of attitudes; an optical filter configured to receive the probe light to adjust an intensity of the probe light; and a processor configured to be in communication connection with the image sensor, the optical filter, the nanosecond pulsed laser, the scanning galvanometer, the multi-axis displacement platform, and the laser Doppler vibrometer.

The invention belongs to the field of laser processing and numerical simulation, and particularly relates to a finite element modeling and analysis method for a nanosecond pulse laser target material. The method comprises the following steps: establishing and loading a laser heat source model; establishing a target material finite element model and carrying out grid division; establishing and solving a transient heat conduction equation; carrying out multi-cycle iterative solution and post-processing; and performing model verification and parameter analysis. According to the method, the laser heat source model is established, the adaptive grid encryption strategy for temperature gradient optimization is adopted, and the transient solution algorithm is combined, so that compared with a traditional simplified analysis model or general commercial software simulation, the prediction precision of the target material temperature field spatio-temporal evolution law under the nanosecond pulse laser effect is remarkably improved. The method can accurately predict the temperature distribution and evolution law of the target material under the action of laser, has the advantages of high modeling precision, good calculation efficiency, wide application range and the like, and is suitable for engineering applications such as laser processing and damage evaluation of optical materials and composite materials.

The invention discloses an image acquisition method and system for a dual-wavelength circular polarization camera, and the method comprises the steps: setting two independent nanosecond pulse laser sources, and respectively transmitting lasers with different wavelengths; respectively carrying out left-hand circular polarization and right-hand circular polarization treatment on the two lasers; integrating the two nanosecond pulse laser beams subjected to circular polarization treatment into one beam, wherein the two beams are completely overlapped and are coaxial; the integrated nanosecond pulse laser beams are irradiated to a target object, and reflected light is collected through a double-spectrum camera to form two images with different wavelengths; and distributing weights for the image according to the importance of the polarization information, and generating a comprehensive image by adopting an image fusion technology. According to the image acquisition method and system of the dual-wavelength circular polarization camera, two independent nanosecond pulse laser sources are arranged to emit short-wavelength laser and long-wavelength laser respectively, the two beams of laser are subjected to left-handed and right-handed circular polarization processing and then integrated into one beam, and efficient imaging in a complex environment is achieved.

The pre-pulse thulium laser lithotripsy system comprises an interaction unit, a control unit, a thulium-doped fiber laser, a thulium-doped fiber amplifier, a laser fiber coupler and a lithotripsy fiber, wherein the interaction unit forwards a user instruction to the control unit; the control unit controls the thulium-doped fiber laser and the thulium-doped fiber amplifier according to a user instruction; the thulium-doped fiber laser outputs laser pulses to the thulium-doped fiber amplifier according to the control instruction; the thulium-doped optical fiber amplifier sets a laser amplification factor according to the control instruction and amplifies the laser pulse; the optical fiber coupler is used for coupling the amplified laser pulse; and the lithotripsy optical fiber acts the coupled laser pulse on the calculus or sticky tissue of the calculus patient. Through the combination of the thulium-doped fiber laser with the MOPA structure and the thulium-doped fiber amplifier, high-peak power nanosecond pulse can be realized, micro-explosion bubbles are instantly generated, the energy loss before laser acts on stones is reduced, the unit energy lithotripsy efficiency is improved, and the lithotripsy effect is improved.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The invention provides a two-dimensional composite laser cleaning device, and relates to the technical field of laser cleaning, the two-dimensional composite laser cleaning device comprises a two-dimensional galvanometer scanning combination package, a pulse laser collimating lens, a light path collimating turn-back package, a continuous laser collimating lens, a plane field lens and a working platform, the pulse laser collimating lens and the continuous laser collimating lens are connected to the two ends of the light path collimation turn-back package respectively, a mechanical arm switching module is arranged on the light path collimation turn-back package, the pulse laser collimating lens is used for being connected with a nanosecond pulse laser, the continuous laser collimating lens is used for being connected with a continuous laser, and the mechanical arm switching module is used for being connected with the nanosecond pulse laser. And the light path collimation turn-back packaging is used for carrying out collimation and compression combination on the pulse laser and the continuous laser so as to output a parallel composite light beam. According to the invention, field curvature and distortion can be effectively suppressed, and the phenomenon of non-uniform energy of light beam scanning is improved.

A fractional handpiece and systems thereof for skin treatment include a passively Q-switched laser assembly operatively connected to a pump laser source to receive a pump laser beam having a first wavelength and a beam-splitting assembly operable to scan a solid beam emitted by the passively Q-switched laser assembly and form an array of micro-beams across a segment of skin. The passively Q-switched laser assembly generates a sub-nanosecond pulsed laser beam having a second wavelength. The fractional handpiece may also incorporate a wavelength switching assembly, enabling selective delivery of both the second and third wavelengths, while providing control over the energy output at each wavelength, all within a single handpiece. The passively Q-switched laser assembly has an unstable cavity operation.

Described herein are treatment tip apparatuses (e.g., devices, systems, etc.) including one, or more preferably a plurality, of electrodes that are protected by an electrode partition, such as an electrode housing (which may be retractable) until pressed against the tissue for deployment of the electrodes and delivery of a therapeutic treatment. In particular, these apparatuses may include a plurality of treatment electrodes (e.g., needle electrodes) and be configured for the delivery of nanosecond pulsed electric fields.

The invention discloses a periodic forked near-transformation limit nanosecond pulse mode-locked fiber laser and a generation method. The laser is characterized in that a fiber ring cavity comprises a wavelength division multiplexer, an erbium-doped fiber, a first polarization controller, a polarization analyzer, a dispersion control unit, an output coupler, a fiber isolator and a second polarization controller which are sequentially connected in a closed loop mode. The method comprises the steps that pumping continuous light is coupled into the laser through the wavelength division multiplexer; pumping continuous light is absorbed by using an erbium-doped fiber and is stimulated to radiate a gain pulse with a long wave band, and the generated pulse oscillates in a fiber laser cavity; under the combined action of a first polarization controller, an analyzer and a second polarization controller, an equivalent saturated absorption effect is generated by utilizing nonlinear polarization rotation generated when gain pulses are propagated in an optical fiber, and pulse mode locking is realized; the optical fiber laser works in an abnormal dispersion region, so that generated pulses meet the soliton area theorem, and near-transformation limit pulses are generated. According to the invention, nanosecond pulse period bifurcation output of the short-cavity fiber laser can be realized.

A fractional handpiece and systems thereof for skin treatment include a passively Q-switched laser assembly operatively connected to a pump laser source to receive a pump laser beam having a first wavelength and a beam-splitting assembly operable to scan a solid beam emitted by the passively Q-switched laser assembly and form an array of micro-beams across a segment of skin. The passively Q-switched laser assembly generates a sub-nanosecond pulsed laser beam having a second wavelength. The fractional handpiece may also incorporate a wavelength switching assembly, enabling selective delivery of both the second and third wavelengths, while providing control over the energy output at each wavelength, all within a single handpiece. The passively Q-switched laser assembly has an unstable cavity operation.

A nanosecond pulser system is disclosed. In some embodiments, the nanosecond pulser system may include a nanosecond pulser having a nanosecond pulser input; a plurality of switches coupled with the nanosecond pulser input; one or more transformers coupled with the plurality of switches; and an output coupled with the one or more transformers and providing a high voltage waveform with a amplitude greater than 2 kV and a frequency greater than 1 kHz based on the nanosecond pulser input. The nanosecond pulser system may also include a control module coupled with the nanosecond pulser input; and an control system coupled with the nanosecond pulser at a point between the transformer and the output, the control system providing waveform data regarding an high voltage waveform produced at the point between the transformer and the output.

The invention provides a laser-induced plasma visualization experiment platform and a use method. The laser-induced plasma visualization experiment platform comprises a laser-induced breakdown module, an image acquisition module and a control module, the laser-induced breakdown module comprises a laser used for emitting pulse laser, an attenuator, a beam compressor and a beam splitter are sequentially arranged in the pulse laser propagation direction of the laser, and a reflector, an amplification objective lens and a cuvette are arranged in the propagation direction of a beam of pulse laser split by the beam splitter; the image acquisition module comprises a high-speed camera and an ICCD (Intensified Charge Coupled Device) camera, and a lens of the high-speed camera and a lens of the ICCD camera are both compared with the cuvette; the control module comprises a computer control submodule and a signal generator, the computer control submodule is in communication connection with the signal generator, the high-speed camera and the ICCD camera, and the signal generator is in communication connection with the laser, the high-speed camera and the ICCD camera. According to the platform, the whole dynamic process of induced breakdown of nanosecond pulse laser in liquid is visualized.

The invention discloses a nanosecond pulse hollow cathode electron beam current evaluation system, which aims at the problem of limited capacity of a current satellite communication channel, researches a nanosecond pulse high-current electron beam for driving a terahertz radiation source, and measures electron beam current and energy density distribution. The device is fixed on a four-axis motion platform through a Faraday cup with a slit hole, and the four-axis platform comprises an x axis, a y axis, a z axis and an R axis. Under the driving of the four-axis platform, the nanosecond time response Faraday cup can rotate around the z axis and sweep the section of the electron beam at a certain rotation angle in the direction perpendicular to the slit, and accordingly parallel projections of the electron beam at different angles are obtained. And current density distribution of a certain section of the electron beam is obtained through a filtering back projection algorithm program of the computer. On the basis, the three-dimensional density distribution of different energy electrons is obtained by changing the axial distance and the electron energy screening voltage, and then the time-space domain distribution of the electron beam energy density is obtained.

An inductive energy-storage forming line type nanosecond pulse generator having an output pulse regulation and control capability, the generator comprising a pulse forming main switch Mmain, a primary energy storage capacitor C, a transmission line Zstorage, a regulation and control switch Mcut, a modulation resistor Rcon, a load Rload and a voltage source Udc. The provided inductive energy-storage forming line type nanosecond pulse generator having an output pulse regulation and control capability regulates and controls, by means of two switches, an electromagnetic wave transmission process in a transmission line during pulse forming while having a high-gain nanosecond square-wave pulse output capability, thus realizing the output impedance matching modulation of a pulse source and having good practical value in biomedical applications.

The invention discloses a device and system for conducting electric field treatment on the digestive tract, the device for conducting electric field treatment on the digestive tract comprises a slender catheter, a supporting body located at the far end of the catheter, an electrode array film and a pulse generator, the electrode array film and the pulse generator are arranged on the supporting body, and the output end of the pulse generator is coupled with an electrode pair on the electrode array film. A sequence pulse wave output by the pulse generator comprises a plurality of groups of nanosecond pulse strings, and the time interval between the adjacent nanosecond pulse strings is 1us-10000 us; the nanosecond pulse string is composed of a plurality of nanosecond pulse pairs, and the time interval between every two adjacent nanosecond pulse pairs ranges from 50 ns to 10000 ns; the nanosecond pulse pair comprises positive pulses and negative pulses which appear alternately, the pulse width of the positive pulses and the pulse width of the negative pulses are 10-1000 ns, and the time interval is 10-1000 ns. The cell membrane permeability and the cell death efficiency can be remarkably improved, and the limitation of the traditional IRE technology is broken through.

The invention provides an optical neural network computing system and method based on time domain excitation characteristics, and the system comprises a pulse clock sequence module which is used for generating a reference time sequence; the multi-channel pulse laser array is used for generating semiconductor neuron laser pulses with subnanosecond pulse width based on a reference time sequence; the time domain and wavelength division multiplexing module is used for simultaneously performing time domain coding and wavelength division multiplexing on the laser pulse based on a reference time sequence to generate a first optical signal; the reconfigurable weight matrix module is used for performing all-optical linear matrix operation and weight mapping on the first optical signal to obtain a second optical signal; the neuron activation module is used for performing nonlinear activation processing on the second optical signal based on an LIF theory to obtain an activated optical signal; and the output module is used for carrying out decoding and photoelectric conversion on the activated optical signal to obtain a network reasoning result.

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 invention relates to the technical field of optical fiber lasers, and provides a middle-infrared band large-range accurate tunable optical fiber laser light source which adopts a large-range tunable 1 [mu] m laser pumping source to obtain ultra-wideband middle-infrared laser output larger than 1000 nm. Comprising a 1 [mu] m wave band tunable pulse seed source, an optical fiber amplifier module, an optical fiber end cap, an end cap coupling device, a hollow-core optical fiber and a small gas cavity, and the 1 [mu] m wave band tunable pulse seed source is a nanosecond pulse laser with the tuning range covering 1024-1080 nm. Based on the direct tuning of the pumping source of the 1 [mu] m wave band, the accurate tuning of the wavelength of the laser of 3 [mu] m-4 [mu] m is directly realized, the tuning is convenient, and a seed source does not need to be added. The pumping source at the 1 [mu] m waveband can obtain high-power laser output more easily, the damage threshold of the hollow-core optical fiber is high, and the mid-infrared output power can be effectively improved. The line width of the gas Raman laser is narrower, and the dispersion of the hollow-core optical fiber is small, so that the output mid-infrared laser has the characteristic of narrow line width.

The invention relates to a method for electrically activating oocytes based on nanosecond pulses. Single oocytes are sequentially and uniformly arranged between two parallel electrodes of an electrode dish, the electrode dish is characterized in that the distance between the electrodes is 1 mm, the electrodes are placed in a culture dish, and the two ends of the two electrodes are sealed; a culture solution is firstly put between the electrodes which are arranged in parallel, mineral oil is covered to prevent the culture solution from being evaporated, after preheating treatment, oocytes are sequentially and uniformly put between the two electrodes which are arranged in parallel one by one, and then nanosecond pulse electric activation treatment is applied. The electrodes which are arranged in parallel are adopted, the oocytes are sequentially and uniformly placed between the electrodes in a single mode, the situation that the electric pulse effect is reduced due to adhesion and stacking of all the cells is avoided, the oocytes receive uniform and equivalent electric pulse sequences, the action effect and stability of electric pulses on the cells are obviously improved, and the operation efficiency of the oocytes is improved. And the reliability and reproducibility of a test conclusion are improved.

The invention relates to a high-peak power nanosecond pulse fiber laser and a use method, and belongs to the technical field of fiber lasers. The nanosecond pulse optical fiber laser sequentially comprises a nanosecond pulse seed, a seed isolation filter arranged at the output end of the nanosecond seed, a first-stage amplification structure, a second-stage amplification structure arranged behind the first-stage amplification structure, a passive homogenization optical fiber, a third-stage amplification structure and an anti-resonance hollow-core optical fiber. And before entering the three-stage amplification, a passive homogenizing optical fiber is adopted to degrade the beam quality of the signal light, a high-order mode is further excited, energy distribution is homogenized, the highest energy density borne by the end face of the optical fiber is reduced, various nonlinear effects are further inhibited, and nanosecond pulse laser output with higher peak power is realized.

The invention relates to a nanosecond fiber laser and method for high-order chaotic pulses. A fiber ring cavity of the laser comprises a wavelength division multiplexer, an erbium-doped fiber, a first polarization controller, an analyzer, a second polarization controller, an output coupler, a dispersion control unit, a fiber isolator and a band-pass filter which are connected in sequence. The method comprises the steps that pumping continuous light is coupled into the laser through the wavelength division multiplexer; pumping continuous light is absorbed by using an erbium-doped optical fiber and is stimulated to radiate a long-wave-band gain pulse; under the combined action of the first polarization controller, the polarization analyzer and the second polarization controller, an equivalent saturable absorption effect is generated by utilizing nonlinear polarization rotation generated when gain pulses are propagated in an optical fiber, and large anomalous dispersion is introduced to realize generation of nanosecond pulses; through the band-pass filter, nanosecond pulses are allowed to be generated, and meanwhile, the nonlinear increasing speed of propagation and accumulation of the nanosecond pulses in the cavity is controlled, so that order-by-order generation of high-order chaotic pulses is realized. According to the invention, reliable output of high-order chaotic pulses can be realized.

The invention relates to a single-objective isotropic three-dimensional super-resolution imaging method, which comprises the following steps of: outputting a linear polarization excitation light beam through a picosecond pulse laser, and outputting a linear polarization loss light beam through a nanosecond pulse laser, adjusting the polarization direction and power of the excitation light beam and the loss light beam by using a half-wave plate and a polarization beam splitter, enabling the loss light beam to enter a spatial light modulator, modulating a light field by loading a preset phase diagram, generating three focuses with different topological charges, axial positions and energy distribution, and outputting the three focuses. The high-order vortex phase retarder is used for carrying out polarization state modulation on the focus and separating loss light beams with different polarization components, the imaging resolution ratio smaller than 100 nm in the transverse direction and the axial direction is achieved, the transverse resolution ratio is similar to the axial resolution ratio, the three-dimensional real structure of an object can be accurately reflected when three-dimensional super-resolution imaging is carried out, and the imaging precision is improved. The imaging resolution is in direct proportion to the loss light intensity, and the higher the loss light intensity is, the higher the three-dimensional imaging resolution is.

The mid-infrared optical parametric oscillator pumped by the dual-wavelength nanosecond pulse solid laser can simultaneously output 1.9 micron laser and 2.1 micron laser, realizes broad spectrum / multi-wavelength output of the mid-infrared optical parametric oscillator, and can ensure that mid-infrared laser has excellent beam quality and relatively high output power. The output power of the 1.9 [mu] m optical fiber laser pumping source is hectowatt magnitude, and the 1.9 [mu] m optical fiber laser pumping source serves as a pumping source of a Ho crystal in the solid laser oscillator. In a Tm solid laser oscillator and a Ho solid laser oscillator, a resonant cavity comprises two plano-concave sub-cavities, the two plano-concave sub-cavities are a Tm crystal oscillation cavity and a Ho crystal oscillation cavity respectively, the two plano-concave sub-cavities share one output mirror, the Tm crystal oscillation cavity adopts a 793 nm semiconductor laser for pumping, and the Ho crystal oscillation cavity adopts a 1.9 [mu] m optical fiber laser pumping source I for pumping; in the phosphorus-germanium-zinc optical parametric oscillator, a planar four-mirror annular cavity is used as a single-resonance optical parametric oscillation cavity.

The invention discloses a direct-current bus multiplication nanosecond pulse power supply and a control method. The direct-current bus multiplication nanosecond pulse power supply comprises an adjustable double-isolation output direct-current power supply, a pulse generating circuit, a pulse boosting transformer integrated with magnetic core reset, a pulse rising edge control circuit integrated with magnetic core reset and a pulse width and falling edge control circuit integrated with magnetic core reset. The adjustable double-isolation output direct-current power supply is used for improving the pulse voltage direct-current voltage so as to be matched with the semiconductor power mode voltage grade. The pulse generation circuit adopts a direct current bus cascade multiplication scheme, realizes direct current voltage multiplication of pulse voltage, breaks through the limitation of the voltage class of a semiconductor power module, improves the output voltage of a nanosecond pulse high-voltage power supply, reduces the number of turns of coils of a pulse transformer and a magnetic switch, improves the working interval of a B-H curve of a magnetic core, and improves the output voltage of the nanosecond pulse high-voltage power supply. Accurate control over the pulse voltage and the direct current voltage is achieved, the cost of equipment is reduced, and the reliability and the application value of the equipment are improved.

The invention discloses a multi-objective optimization design method for a high-voltage nanosecond pulse adder, and aims to solve the problem that the prior art depends on experience trial and error and is difficult to consider multiple objectives such as fast leading edge, high efficiency, portability and reliability. The method comprises the following steps: firstly, building a simulation and experiment platform, and acquiring output waveform data for changing topological parameters; constructing a physical model of the influence rule of the parasitic parameters on the pulse rising edge time and the voltage gain, and establishing a power supply efficiency prediction model based on a deep neural network; taking the minimization of the pulse rising edge time and the maximization of the voltage gain and the energy efficiency as targets, constructing a particle swarm optimization multi-target optimization model in combination with the model, and obtaining a Pareto optimal solution set under the constraints of portability and parasitic parameters; and finally, carrying out experimental verification iteration to obtain an optimal scheme. According to the invention, the design period is obviously shortened, the multi-target conflict is effectively balanced, the rising edge time is shortened, the energy efficiency is improved, the voltage gain is improved, the portability is enhanced through the modular design, and the wearable application is compatible.

The invention relates to the technical field of slice lasers, in particular to a Yb-based high-power pulse slice laser with an adjustable pulse width. Comprising a pumping source, a multi-pass pumping module and a resonant cavity which are sequentially arranged along a light path, and the resonant cavity is composed of a first end mirror, a thin-sheet crystal, a thin-film polaroid, a quarter-wave plate, an electro-optical switch and a second end mirror according to the light path sequence. The slice crystal serves as a gain medium and is used for pumping pump light and generating a laser beam; the thin film polarizer highly transmits horizontal polarized light and highly reflects vertical polarized light and is used for outputting laser in the cavity, the quarter-wave plate and the electro-optical switch are used for controlling loss in the cavity so as to output nanosecond pulses, and the plane mirror is used as a resonant cavity end mirror. The pulse width output by the slice laser can be effectively regulated and controlled, the regulation range reaches ten to hundreds of nanoseconds, and the power output by the laser does not change along with the change of the pulse width.

The application relates to a wideband high-power microwave protection module design method based on field line coupling, and belongs to the technical field of circuit simulation. The method comprises the following four steps: testing the response of a protection device under a nanosecond pulse; constructing an equivalent circuit model of a pulse source and the protection device; designing a protection module and simulating the characteristics of the protection module through a field line coupling method; and optimizing the protection module. The application has the following advantages: the field line coupling characteristics are considered, a protection module protection performance verification model is constructed, a cable coupling interference waveform is used to verify the protection performance of the protection module, and the accuracy of the protection performance simulation of the protection module is improved.