56 results about "High peak" patented technology

The invention relates to the technical field of laser, and provides a laser system with a controllable pulse state and a control method thereof. The control method of the laser system with the controllable pulse state comprises the steps that under the conditions that the cavity length of an FP cavity is in an initial fit state and the air pressure in the FP cavity is standard air pressure, a pump light source is controlled to adjust the pump power according to a first set; in response to the fact that the target pulse interval is smaller than the initial pulse interval, the pump light source is controlled to keep the target power unchanged, the air pressure of the FP cavity is adjusted to be within the preset range, and the cavity length of the FP cavity is adjusted through a second set; determining a target cavity length; controlling the laser to be output in a first pulse state; and controlling the laser to output in a second pulse state. According to the control method, the controllably generated abnormal wave form with the high peak power is introduced according to the preset frame structure to serve as a physical layer disturbance or random segment, and the reliability and safety of system signal transmission are improved under the condition that data segment transmission is not affected.

A handheld drone denial device, characterized in that the device comprises a laser emission unit comprising a high peak power pulsed laser and an adjustable beam expander, a sighting unit comprising a range finder and a sighting scope, a control unit comprising a denial device start and laser emission unit trigger switch, a power supply and a housing, the configuration of the laser emission unit, sighting unit, control unit, power supply, the structure of the housing and the arrangement of the units including the power supply on the carrier satisfy that the device discovers, locks and measures the range of a drone target through the sighting unit, manually or automatically adjusts the output laser beam divergence angle of the beam expander according to the range measurement result, and then or simultaneously triggers the laser emission unit trigger switch to emit laser to the drone target, wherein the adjustment of the beam expander includes that the adjustment of the beam divergence angle from a range of 500 meters to a range of 100 meters is incremental adjustment, or the adjustment of the beam divergence angle from a range of 100 meters to a range of 500 meters is decremental adjustment.

The invention provides a method for processing a micropore by combining vortex beam shaping femtosecond laser with nanosecond laser, which comprises the following steps of: firstly, taking charge of melting and sublimation of a material by utilizing the high-power characteristic of the nanosecond laser, and then taking charge of finish machining of the hole wall of the processed micropore by utilizing the characteristics of small heat affected zone and high peak energy of the femtosecond laser. Therefore, the problems that the heat affected zone of the hole wall of the micropore machined by nanosecond laser is large, and the machining quality of the hole wall is poor due to material melting and recasting are solved. Therefore, the advantages of high efficiency of nanosecond laser micropore processing, small thermal damage area of femtosecond laser material processing and high micropore pattern quality of the processed micropore are combined, coarse and fine synchronous processing is finally realized, and the processing quality of the micropore wall is improved.

The application provides a composite pulse laser, comprising: a full reflection mirror, a laser module, a Q switch, an output coupling mirror, a pump driving source, a Q switch driving source, and a main controller; the full reflection mirror, the Q switch, the laser module, and the output coupling mirror are arranged horizontally in sequence to ensure optical coaxiality and form a laser resonant cavity; the pump driving source is connected with the laser module and is used for controlling the pumping time of the pump source in the laser module; the Q switch driving source is connected with the Q switch and is used for controlling the opening time of the Q switch; the main controller is connected with the pump driving source and the Q switch driving source respectively and is used for controlling the relative delay time of the pump driving source and the Q switch driving source. The application solves the defect that the common Q-switched laser in the prior art is difficult to realize single light emission with high peak power and high average power, and realizes quasi-continuous composite pulse laser with high peak power and high average power.

The invention belongs to the technical field of 3D printing, and particularly relates to a continuous pulse mixed type patterning laser powder bed light path system and method.Laser powder is preheated to be close to a melting point but not molten through set continuous-period light emitting, the preheated laser powder is completely molten through pulse-period light emitting, and in other words, the continuous pulse mixed type patterning laser powder bed light path system and method are obtained; continuous light is only used for preheating powder for a short time, so that the powder is close to a melting point but not molten; then peak energy is rapidly provided through microsecond pulsed light, powder melting is completed instantly, in this way, the effective heating time is shortened, the heat radiation range of heating is controlled, the heating time of a system is far shorter than the heating time of traditional continuous light, melting and solidification are completed when heat is not diffused out of a preset pattern in time, and the production efficiency is greatly improved. Therefore, the fusion area is limited within the pattern range, the subsequent part forming precision is improved, and laser loss caused by too high peak power due to short time is reduced through pulse light emitting and continuous light emitting.

This invention discloses an all-weather reconnaissance and alarm device, comprising a laser illumination component, an ICCD / ICMOS gating component, and an integrated processor. The laser illumination component uses high peak power pulsed laser light for illumination assistance, enhancing target brightness. The ICCD / ICMOS gating component is used to achieve high-gain photoelectric conversion of weak optical signals. Specifically, the ICCD / ICMOS gating component eliminates or reduces the influence of sunlight through "ultrafast adaptive imaging + light decay," enabling the component to operate in the linear region with the optimal signal-to-noise ratio for the target. Simultaneously, the ICCD / ICMOS gating component integrates a high-speed CCD / CMOS image sensor. Without changing the delay time, a higher image intensifier repetition frequency results in a smaller increase in delay time. Through ultra-high-speed image acquisition, it fully utilizes the energy of each laser pulse, enabling imaging of targets at different distances and high-speed moving targets. The integrated processing component focuses on controlling the ultrafast adaptive adjustment duration, the interval between auxiliary illumination and gating opening, and high-precision gain control.

The application relates to a kind of plasma diagnostic method and device based on femtosecond laser filament probe, belong to laser plasma diagnostic technical field, method utilizes the high peak power characteristics of femtosecond laser to form the femtosecond filament probe with only hundred microns in diameter and only several millimeters in length, and the internal substance of plasma can be excited again.Spectra signals when using and not using femtosecond filament probe are collected respectively, and the element information at the position of femtosecond filament probe at this moment is obtained by differentiating the spectrum.By scanning the relative position of femtosecond filament probe and plasma, the material content information at different spatial positions in plasma can be obtained, and by changing the delay time when femtosecond laser pulse and plasma are generated, the material distribution information in plasma at different time can be obtained, and the four-dimensional distribution information of the material in plasma can be obtained by coincidence of the spectrum under different positions and different delay times.

The present application relates to a kind of PWM driving method for realizing LED output high peak power, selects adaptive LED device, definite its rated current I0, rated voltage U0 And maximum tolerance junction temperature, definite light peak power P demand;Build PWM driving device, cooperate with the conduction and cut-off of PWM pulse signal, so that LED device only in the high level stage of PWM pulse conduction, conduction time τ It is 0.1 μs~50 μs, in low level stage cut-off, no current passes through;The frequency of control PWM pulse, according to the demand of actual application scene, fine-tune PWM pulse conduction time τ And peak current I, I is actually adjusted voltage peak value, can further improve the peak power of output light, and make LED device maintain the parameter stable work.The present application realizes super high peak power output, guarantees LED safe and stable work, high flexibility, strong adaptability, simple structure, easy to realize.

The utility model relates to the technical field of optical fiber laser, concretely is a kind of main amplifier and high peak value double-pulse optical fiber laser, the main amplifier includes water-cooling mounting plate and the first active optical fiber, active pumping signal combiner, space isolator, beam expander lens group, reflector group, power meter that are sequentially arranged in the water-cooling mounting plate, there is quartz end cap on the output optical fiber of the active pumping signal combiner, long barrel diaphragm is provided between the reflector group, the main amplifier is located on the reflection output light path of reflector group still be provided with window piece.The utility model is through pumping signal combiner, active optical fiber, cladding light stripping area, quartz end cap height integration, greatly reduce nonlinear effect, space isolator, beam expander lens group are separated simultaneously greatly enhanced the use flexibility, and internal device can be replaced, and the scope of application is wide.

This invention discloses a device and method for real-time thermal focal length measurement of a long-pulse LDA side-pump module. The device includes a detector source, a beam expander system, an LDA side-pump module, a knife edge, an energy meter, and a signal generator. The detector source serves as the detection light source for thermal focal length measurement; the beam expander system serves as a beam expander for the detector source size; the LDA side-pump module serves as a heat source generator to achieve high peak power pump injection under long-pulse pumping; the knife edge is placed on both sides of the beam waist position after the detector source passes through the LDA side-pump module to cut the transverse and longitudinal beams, achieving beam size characterization; the energy meter is placed in the rear region of the measurement device to acquire the energy measurement of the detector source; and the signal generator serves as a timing control part to achieve timing synchronization between the detector source and the LDA side-pump module. This invention uses timing synchronization combined with Gaussian beam transmission transformation to obtain the thermal focal length value of the long-pulse LDA side-pump, which has the advantages of simple structure, ease of operation, and high measurement accuracy.

The present application relates to a kind of RB-SiC surface femtosecond laser modification pretreatment method, by femtosecond laser to the preset Si powder on RB-SiC surface is modified and handled, to improve the polishing efficiency of RB-SiC surface.The present application can directly carry out surface modification to the cutting surface of RB-SiC, Si powder prepositioned on the surface of RB-SiC is rapidly oxidized under the action of the high peak power of femtosecond laser, and with the deepening of the depth of oxidation, so that the modified layer after oxidation forms bonding with RB-SiC matrix, obtains a modified coating with high adhesion strength, high quality.The method has the advantages of simple operation, low requirement to RB-SiC matrix and working environment, can be directly carried out in air, etc., can be applied to the surface modification of RB-SiC with complex surface shape, can significantly improve its polishing efficiency.

The application belongs to the field of Raman laser, and particularly relates to a red-green-blue three primary color large pulse energy Raman laser, which comprises a pumping laser, a plano-convex lens A, a Raman cell and a plano-convex lens B, the pumping laser is a Nd:YAG pulse solid laser, a mixed gas of D2 and inert gas in the Raman cell is pumped by a doubled 532nm pulse laser, three times of focusing are carried out in the Raman cell, and finally first order Stokes red laser, first order anti-Stokes blue Raman laser and green pumping laser are simultaneously output, the pulse energy reaches above 140mJ, 50mJ and 140mJ respectively, and the peak power reaches 10MW level. The application has the advantages of simple structure, fast debugging, low cost and high peak power of output laser, and provides a Raman laser for generating red-green-blue three primary color laser with high cost performance and large pulse energy.

The invention discloses a terahertz wave pulse emitter based on a ferromagnetic heterojunction. The terahertz wave pulse emitter mainly comprises a substrate, a reflecting layer, the ferromagnetic heterojunction, a spacing layer, microspheres, a conductive layer, a rear cover and an anti-reflection layer. In addition, the invention further provides a manufacturing method of the terahertz wave pulse transmitter based on the ferromagnetic heterojunction. By irradiating the terahertz wave pulse emitter based on the ferromagnetic heterojunction with femtosecond laser, terahertz pulses with high peak field intensity can be generated. The terahertz wave pulse emitter provided by the invention has the advantages of simple structure and large spectral bandwidth, and is suitable for the fields of terahertz wave imaging, security and protection and the like.

The application discloses a high-peak-power high-energy pulse laser generating device and method, and belongs to the technical field of pulse lasers.The device comprises a high-reflectivity fiber grating, a forward pumping combiner, a gain fiber, an energy transmission fiber, a backward pumping combiner, a pumping module, a pumping source driving power supply, a low-reflectivity fiber grating and a fiber output end.The device for generating pulse lasers has simple structure and strong power expansion performance, and can be used for laser processing and laser cleaning.

The invention provides a frog-shaped hollow-core anti-resonance optical fiber. The optical fiber comprises a cladding made of quartz glass, and frog-shaped air holes formed by periodically arranging a plurality of same concave structures are formed in the cladding. Each concave structure is formed by intersecting two concave semi-arc-shaped edges at one end point, and the adjacent concave structures are smoothly connected through a section of convex large semi-arc-shaped wall. A first anti-resonance layer and a second anti-resonance layer are formed on the inner wall of the frog-shaped air hole and used for limiting light waves in an air fiber core defined by the air hole structure for transmission through the anti-resonance reflection effect. Through the unique concave structure design, the invention aims to optimize the light wave limiting capability, so that the optical fiber realizes low-loss transmission at the infrared band of 1.5-2.0 microns, and is suitable for the transmission of high-peak power laser pulses.

The application relates to the field of laser technology and provides a laser system with controllable pulse states and a control method thereof. The control method of the laser system with controllable pulse states comprises the following steps: when the cavity length of an FP cavity is in an initial matching state and the air pressure in the FP cavity is a standard air pressure, a pump light source is controlled to adjust the pump power in a first set; in response to a target pulse interval being smaller than an initial pulse interval, the pump light source is controlled to keep the target power unchanged, the air pressure of the FP cavity is adjusted in a preset range, and the cavity length of the FP cavity is adjusted in a second set; a target cavity length is determined; the laser is controlled to output in a first pulse state; and the laser is controlled to output in a second pulse state. The control method introduces controllable abnormal wave forms with high peak power as physical layer disturbances or random sections according to a predetermined frame structure, improves the reliability and safety of system signal transmission without affecting data section transmission.

The application belongs to the field of femtosecond laser technology, and particularly relates to a few-cycle high-energy fiber chirped pulse amplification system and method. The system comprises a seed source module, a chirped pulse amplification module and a hybrid compression module. The seed source module adopts a nonlinear polarization rotation mode-locked resonator with an integrated tunable filter to generate linear chirped wide spectrum seed pulses with tunable central wavelength. The chirped pulse amplification module realizes energy amplification while effectively suppressing gain narrowing effect through a three-stage structure of pre-chirp management, pre-amplification and main amplification. The hybrid compression module adopts a cascaded scheme of a diffraction grating compressor and a fiber soliton self-compressor to finally compress the pulse width to two optical periods. The application solves the problem that high energy and few cycles are difficult to be considered in a C-band fiber amplification system, and can output high peak power pulses of hundreds of nanojoules and two optical periods.

The application belongs to the field of Raman laser, and particularly relates to a Herriot type multi-pass cell anti-Stokes Raman high peak power blue laser, which comprises a pumping laser, a plano-convex lens A, a Raman cell, a plano-convex lens B and a 45-degree angle dichroic mirror, the pumping laser is a Nd:YAG pulse solid laser, a 532nm pulse laser is used to pump a mixed gas of H2 and inert gas in the Raman cell, three times of focusing are carried out in the Raman cell, and finally a first order anti-Stokes Raman blue laser is output, the conversion efficiency of the first order anti-Stokes Raman blue laser can reach 10-15%, the pulse energy can be more than 50mJ, and the peak power reaches 10MW level. The application has the advantages of simple Raman laser structure, convenient and fast installation and adjustment, and provides a blue laser for generating high peak power blue laser with high cost performance, especially for the blue laser which is difficult to generate by a conventional method.

The invention relates to the technical field of photoelectric detection, in particular to a photoelectric detector and system based on ferroelectric perovskite non-degenerate two-photon absorption. The photoelectric detector comprises a substrate layer; the metal electrode layer is positioned on the substrate layer; the light absorption layer is located on the substrate layer and is composed of a ferroelectric perovskite thin film; the protective layer is formed by a boron nitride film; the metal electrode layers are located on the two sides of the light absorption layer. The photoelectric detector can perform photoelectric detection by using a ferroelectric perovskite non-degenerate two-photon absorption effect, a detection threshold value is reduced by one order of magnitude, and measurable light current can be generated for weak light without high-peak light power; a built-in electric field generated by spontaneous polarization of the ferroelectric perovskite can effectively separate electron-hole pairs, so that the signal-to-noise ratio and the response speed are greatly improved; and the structure is simple, the cost is low, and high-sensitivity and stable detection on weak light can be realized.

The present invention relates to a broadband frequency doubling device with a special cutting angle and its application, and belongs to the field of laser and nonlinear optics. The special cutting angle is (113°, 25.9°) for YCOB crystals and (114.1°, 32°) for GdCOB crystals. When the center wavelength of the fundamental frequency light is within the range of 1550-1700nm, the YCOB and GdCOB crystals processed according to the above-mentioned cutting angle can achieve high-efficiency, wide-band frequency doubling output. The present invention has the advantages of low production cost, mature crystal growth process, high temperature stability, high anti-light damage threshold, high conversion efficiency, and large spectral bandwidth. Combined with erbium-doped solid-state laser technology, it can achieve high-efficiency, wide spectrum, narrow pulse width, and high peak power ultrafast pulse laser output with a wavelength of near 800nm.

The invention discloses a regenerative amplifier based on a slab medium and a double-end pumping configuration, and belongs to the technical field of laser technologies and photoelectric devices. The regenerative amplifier comprises a seed source, a modulator, an amplifier, an isolator, a polarization control element, an electro-optic Q-switched crystal, a slab laser crystal, a double-end pumping system and a resonant cavity structure. The amplifier adopts the lath gain medium, heat sinks are bonded on the upper surface and the lower surface to improve the heat dissipation efficiency, the pump light is uniformly distributed in the crystal in combination with a double-end symmetric pumping mode, and the energy utilization rate and the light beam quality are improved. Seed light reciprocates in the resonant cavity for multiple times, and after multi-pass amplification and energy accumulation, cavity emptying is achieved through electro-optical Q-switching control, and high-peak-power laser pulses are output. The problems that a traditional regenerative amplifier is serious in heat effect, uneven in gain, limited in output power and the like are effectively solved, and the regenerative amplifier is suitable for the high-energy laser application fields such as laser micromachining and ultrafast spectrums.

The invention discloses a time domain peak shifting amplification system and method, and belongs to the technical field of optical amplification. According to the system, firstly, an input single laser pulse sequence is decomposed into two sub-pulse sequences with preset time delay in a time domain through a time domain peak shifting module; then the sub-pulse sequences are sequentially amplified through the same gain region of the same common amplification module, so that the instantaneous power in the amplification process is reduced; and finally, performing delay compensation on the amplified sub-pulse sequences through a synchronous beam combining module, and combining the sub-pulse sequences into a single high-energy output pulse sequence. According to the technical scheme, through combination of time domain peak shifting and common amplification, the problem of optical damage caused by too high peak power in the amplification process of high-power ultrafast laser is solved, meanwhile, the output energy limit of a single amplification system is effectively improved, and the system structure is remarkably simplified.

The application discloses a kind of automatic frequency stabilization system and method of laser based on real-time automatic peak seeking technology, system includes the frequency automatic tuning module based on frequency-current-temperature model;Frequency reference automatic identification module based on adaptive threshold method;Frequency automatic closed-loop control module;Frequency lockout and stability periodic monitoring lock state monitoring and judging module.The application solves the problem of traditional frequency tuning method to oscilloscope and artificial dependence.Based on the peak seeking method of adaptive threshold, frequency reference identification positioning is realized without human intervention;Combined with the closed-loop control system of periodic checking lock frequency system stability, not only monitor laser lockout state, but also real-time monitor laser locking precision, and adjust laser closed-loop module according to monitoring state.The application has the advantages of high peak identification precision, strong noise immunity, high locking precision and good long-term stability.

The invention relates to the technical field of lasers, and discloses a pulse laser and a laser radar, which comprise a narrow linewidth light splitting seed source, a modulator, a power divider, a delay unit, a pre-amplification unit, a power amplification unit and a beam combining unit, in actual use, the continuous seed light generated by the narrow-linewidth light splitting seed source is modulated into a pulse light signal with a 10-nanosecond pulse width through the modulator, then the pulse light signal is shunted and amplified, and finally the pulse light signal with a 100-nanosecond pulse width is synthesized, so that the nonlinear effect and the pulse waveform distortion are reduced; and the output pulse optical signal has high peak power and high waveform fidelity at the same time.

The application discloses a kind of ultra-wide waveband tunable mid-infrared laser device and light beam pointing stability method, the device includes fundamental frequency pump source, ultra-wide tuning ring resonator, nonlinear frequency conversion crystal, laser wavelength tuning controller, light beam pointing stability controller;Fundamental frequency pump source is used to provide the pump laser of high peak power pulse emission, ultra-wide tuning ring resonator adopts special hetero angle design, with high refractive index intrinsic substrate as input and output coupling mirror, pump laser is incident with Bragg angle high refractive index intrinsic substrate and is coupled into resonator by it, at least two cavity mirrors in resonator mirror are gold mirror, which is high reflection for near-infrared and mid-infrared band, pump light is coupled into resonator by nonlinear frequency conversion crystal and forms closed loop optical path in resonator, realizes high-efficiency optical parametric oscillation and generates mid-infrared laser with extremely wide wavelength tuning range, light beam pointing stability controller controls resonator mirror to compensate light beam pointing deviation, realizes wavelength continuous tuning and light beam pointing keeps unchanged.

The application discloses a 193nm wavelength vacuum ultraviolet all-solid-state pulse laser and belongs to the technical field of lasers. A 355nm laser pulse is obtained by tripling a 1064nm fundamental frequency pulse laser, the 355nm laser pulse is used as pumping light of an optical parametric oscillator, 472nm signal laser output is obtained, and 236nm deep ultraviolet laser pulses are obtained by frequency doubling. The 236nm deep ultraviolet pulses are combined with the 1064nm fundamental frequency laser pulses after time delay to generate frequency sum, and finally, 193nm vacuum ultraviolet laser pulse output is obtained. The application has the characteristics of compact structure, high peak power and scalable repetition frequency, and the obtained 193nm vacuum ultraviolet laser can be used as an important tool in the research fields of precision laser processing, fiber grating preparation, semiconductor integrated circuit manufacturing and the like.

A method for weather modification and precipitation enhancement can include emitting a pulsed laser beam to promote in-cloud interactions by generating shock and acoustic waves in the cloud. The repetition rate of the pulsed laser can be between about 1 kHz and about 200 kHz, which can be arbitrarily modulated. These interactions can induce convection and turbulence within the cloud, improving the collision-coalescence process and facilitating efficient precipitation in the cloud. Furthermore, the method involves arbitrary modulation of the pulsed laser repetition rate, which can generate acoustic waves of a wide range of frequencies. This capability can initiate acoustic wave agglomeration, in turn enhancing the collision-coalescence process for precipitation. The method can also include steering the beam in a helical or spiral path to increase the scale of the rainfall enhancement. The method, which does not use chemicals, can provide an environmentally friendly alternative to traditional cloud seeding methods for rainfall induction.

The invention discloses a peak regulation demand typical scene generation method and device for high-proportion new energy power system planning, and a medium, and belongs to the technical field of power system planning and operation, and the method comprises the steps: collecting time sequence data of a new energy power system, and carrying out the preprocessing; constructing an extreme value sequence to obtain a relative peak-valley difference matrix; clustering by taking the relative peak-valley difference matrix as a characteristic index to obtain a clustering result; extracting a new energy power system time sequence data curve of the representative day according to a clustering result; and combining the time sequence data curves of the new energy power system to obtain a net load representative day scene of the high peak regulation demand of the target year. The method has the beneficial effects that the definition of the relative peak-valley difference matrix is provided, the relative peak-valley difference matrix is used as a characteristic index of a clustering algorithm, wind / light / load historical sample data is grouped, and daily power curves with similar peak value and valley value appearing time periods and similar intra-day maximum peak-valley difference can be more effectively clustered into one class.