73 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.

The invention discloses an ultra-wide-band tunable intermediate infrared laser device and a light beam pointing stabilizing method. The device comprises a fundamental frequency pumping source, an ultra-wide tuning annular resonant cavity, a nonlinear frequency conversion crystal, a laser wavelength tuning controller and a light beam pointing stabilizing controller. The fundamental frequency pumping source is used for providing pumping laser for high-peak power pulse emission, the ultra-wide tuning annular resonant cavity adopts a special special-shaped angle design, a high-refractive-index intrinsic substrate is used as an input and output coupling mirror, and the pumping laser enters the high-refractive-index intrinsic substrate at a Bronsted angle and enters the resonant cavity through coupling of the high-refractive-index intrinsic substrate; at least two cavity mirrors in the resonant cavity mirror are gold mirrors highly reflecting near-infrared and middle-infrared bands, the pump light passes through the nonlinear frequency conversion crystal and forms a closed-loop light path in the resonant cavity, efficient optical parametric oscillation is achieved, and middle-infrared laser with an extremely wide wavelength tuning range is generated. And the light beam pointing stabilization controller controls the resonant cavity mirror to compensate light beam pointing deviation, so that continuous wavelength tuning is realized, and the light beam pointing is kept unchanged.

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 invention relates to a low-repetition-frequency narrow-pulse-width pulse fiber laser beneficial for inhibiting ASE light, and the laser comprises a low-repetition-frequency narrow-pulse-width seed source which is used for providing a low-repetition-frequency narrow-pulse-width seed pulse with the repetition frequency of 1-500 KHz and the pulse width of 1-50 ns, and outputting the seed pulse to a wave combining module; the continuous injection source is used for providing continuous laser and outputting the continuous laser to the wave combining module; wherein the peak power of the seed pulse is at least 10 times of the peak power of the continuous laser, and the average power of the seed pulse is equal to-0.5 to 1.5 times of the average power of the continuous laser; the wave combining module is used for simultaneously transmitting the seed pulse and the continuous laser to the amplification module; the amplification module is used for amplifying the power of the seed pulse to form pulse laser with low repetition frequency, narrow pulse width and high peak value and transmitting the pulse laser to the filter; wherein in the seed pulse power amplification process, the continuous laser forms a gain suppression effect on the ASE light; the filter is used for filtering the continuous laser provided by the continuous injection source and outputting amplified pulse laser, the continuous injection source is utilized in the seed pulse amplification process, generation of ASE light is effectively restrained, the control difficulty of the system for the pumping source and the injection source is lowered, the signal-to-noise ratio of the system is further improved, and the service life of the system is prolonged. And powerful support is provided for application of the fiber laser in multiple fields.

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.

The invention belongs to the technical field of light beam synthesis, and particularly discloses a coherent synthesis light source regulation and control device and method for pulse output. Comprising a plurality of single-frequency lasers used for outputting single-frequency laser; the optical phase modulators are arranged in one-to-one correspondence with the single-frequency lasers and are used for performing phase adjustment on the single-frequency lasers; a plurality of polarizers which are arranged in one-to-one correspondence with the optical phase modulators and are used for carrying out polarization processing on the single-frequency laser after phase adjustment; the gathering device is used for carrying out focusing processing on the plurality of single-frequency lasers processed by the polaroid; the synthesis grating is used for coherently synthesizing the plurality of focused single-frequency lasers into a beam of pulse laser and outputting the pulse laser; the angles of the multiple single-frequency laser beams incident on the synthesis grating meet the grating diffraction synthesis relation. According to the invention, the diffractive optical element is adopted to coherently combine a plurality of continuously output single-frequency laser beams, so that high-average-power and high-peak pulse laser source output is realized, and the laser pulse width is adjustable.

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 invention relates to the technical field of super-continuum spectrum generation, and particularly provides a cross-octave super-continuum spectrum light source generation device and optical equipment, the cross-octave super-continuum spectrum light source generation device comprises a focusing lens and at least one group of solid structures, and ultrashort pulse fundamental frequency light enters the solid structures after being tightly focused; incident fundamental frequency light is firstly subjected to self-phase modulation in a first nonlinear action medium, a first super-continuum spectrum with a certain spectral width at the central wavelength of the fundamental frequency light is generated under the cross-phase modulation action, and except for the central wavelength, the first super-continuum spectrum is transmitted through a frequency doubling crystal; the spectrum at the central wavelength passes through a frequency doubling crystal to realize ultrashort pulse frequency doubling light, the frequency doubling light with high peak intensity generates a self-phase modulation effect in a second nonlinear action medium to generate a second super-continuum spectrum at the central wavelength of the frequency doubling light, and the two super-continuum spectrums form a cross-octave super-continuum spectrum light source; the super-continuum spectrum generation with high pulse energy is realized, the super-continuum spectrum generation range is further widened, and the multi-spectrum super-continuum spectrum generation is realized.

The invention discloses a saturable absorber based on Bi2Te3 / Sb2Te3 and an all-solid-state passive Q-switched mode-locked pulse laser based on Bi2Te3 / Sb2Te3. The structure of the saturable absorber based on Bi2Te3 / Sb2Te3 comprises a substrate and a saturable absorption layer arranged on the surface of the substrate, wherein the saturable absorption layer comprises a polymer matrix and a Bi2Te3 / Sb2Te3 transverse heterojunction material. According to the invention, the thermal stability and the mechanical strength of Bi2Te3 / Sb2Te3 can be effectively improved. In an all-solid-state laser, a saturable absorber based on a Bi2Te3 / Sb2Te3 transverse heterojunction material is used as a Q-switched mode-locked starting element, stable passive Q-switched mode-locked laser operation with the wavelength of 1064 nm is achieved, and obtained pulse laser output has high peak power, narrow pulse width, excellent light beam quality and high stability.

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.

The invention discloses a weighted trapezoidal integral white light interference signal peak searching method, which comprises the following steps of: acquiring a group of three-dimensional light intensity data through a white light interference measuring instrument, determining a self-adaptive integral parameter according to the central wavelength and the spectral width of a light source, selecting an integral weighting function, creating an integral window, and then carrying out weighted trapezoidal integral to obtain a white light interference signal peak searching result. And calculating a zero optical path position of the position, traversing each pixel position one by one, and calculating positions of all interference peak values to realize surface topography reconstruction. According to the method, the interference signal peak searching problem in white light interference measurement is solved, and the provided method has high anti-noise capability, high peak searching accuracy and high calculation speed, can be applied to different white light interference measurement instruments, and is wide in application range.

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 invention relates to a plasma diagnosis method and device based on a femtosecond laser filamentation probe, and belongs to the technical field of laser plasma diagnosis, the femtosecond filamentation probe with the diameter of only hundreds of microns and the length of only several millimeters is formed by using the high peak power characteristic of femtosecond laser, and substances in plasma can be excited again. Spectral signals when the femtosecond filamentation probe is used and when the femtosecond filamentation probe is not used are collected respectively, and element information at the position of the femtosecond filamentation probe at the moment is obtained by differentiating spectrums. The relative position of the femtosecond filamentation probe and the plasma is scanned to obtain the substance content information at different spatial positions in the plasma, and the substance distribution information in the plasma at different moments can be obtained by changing the delay time of the femtosecond laser pulse and the plasma generation moment. And conforming the spectrums at different positions and at different delay times to obtain four-dimensional distribution information of the substances in the plasma.

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 invention discloses a broadband spectrum laser pulse energy amplification method, and belongs to the technical field of ultrafast laser, and the method comprises the steps: sequentially carrying out the spectrum broadening, difference frequency and pulse time domain broadening of a titanium sapphire kilohertz laser pulse, and carrying out the pre-compensation of high-order dispersion introduced in the subsequent pulse energy amplification process; a double-chirp optical parametric amplification technology is utilized, a first wave band in the obtained infrared seed laser pulse is amplified to a first set value, a second wave band is pre-amplified to a second set value, and the first wave band is smaller than the second wave band; the chirped pulse amplification technology is utilized, a third wave band in the infrared seed laser pulse is amplified to a third set value, and the third wave band covers the long wave band in the first wave band and the second wave band; and performing pulse time domain compression on the output infrared seed laser pulse to obtain an infrared seed laser pulse with a near Fourier transform limit pulse width. According to the method, the high-peak-power single-optical-period infrared laser pulse can be obtained.

The present invention relates to the field of radiotherapy laser control technology, and specifically to a Q-switched laser-based color spot beauty intelligent control method and system. The present invention first obtains the skin connected domain in each image block in the face image; further obtains the grayscale difference parameter, edge roughness parameter and grayscale change parameter of each skin connected domain; further screens the color spot area according to the grayscale difference parameter, edge roughness parameter and grayscale change parameter of each skin connected domain; finally, adjusts the high peak power of the Q-switched laser according to the area change rate of the color spot area. The present invention accurately identifies the color spot area from the grayscale difference angle and edge roughness angle of the color spot compared to normal skin, as well as the internal grayscale change difference angle of the color spot and acne, thereby adjusting the high peak power of the Q-switched laser according to the area change of the color spot area, thereby improving the color spot beauty effect and patient experience.

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.