33 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 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 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 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 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 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 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.

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.

This invention discloses a single-frequency pulsed laser with spectral linewidth self-compression based on pulse waveform pre-compensation. The laser comprises a pump source, a pump coupling device, an active fiber, and an output collimator forming a fiber amplifier to amplify the power of a single-frequency pulsed laser output from a single-frequency pulsed seed source with pulse waveform editing capabilities. An isolator protects the single-frequency pulsed seed source with pulse waveform editing capabilities. The laser employs spectral linewidth self-compression based on pulse waveform pre-compensation to optimize the spectral characteristics of the pulsed laser and suppress linewidth broadening during amplification. This laser achieves high peak power and near-Fourier transform-limited linewidth single-frequency pulsed fiber laser output without adding additional laser devices. Furthermore, this technology allows for linewidth tuning through pulse waveform manipulation.

This invention discloses a method for measuring distance and velocity based on trapezoidal wave optical frequency-modulated continuous wave, including a target object, a lidar, and an analog-to-digital converter. The frequency value of the beat signal at the rising edge is denoted as f1, the frequency value at the falling edge as f2, and the frequency value of the beat signal in the invariant region as fd. The beat signal is sampled by a data acquisition card, yielding two main frequency values: f+ and f-, where f+ is the highest peak frequency and f- is the second highest peak frequency, i.e., f+ > f-. This method improves the range and velocity measurement limits without changing the hardware, without sacrificing horizontal resolution or frame rate. Furthermore, the sum of the highest Doppler frequency and the distance frequency that can be sampled is no longer limited by the Nyquist frequency, but can instead reach the sampling frequency of the analog-to-digital converter. The two trapezoidal waves used in this method are equivalent, and the waveforms are easy to implement.

The application discloses a high-peak-power all-fiber femtosecond laser system based on GMN spectrum shaping technology, and belongs to the field of laser technology and nonlinear optics. The system comprises an all-fiber broadband GMN seed source, an all-fiber gain narrowing spectrum shaping system based on a nonlinear amplification ring mirror, a high-power fiber laser amplifier and a pulse compressor. The system comprises the following optical devices: a pump source, a wavelength division multiplexer, a gain fiber, a 2*2 fiber coupler, a beam combiner, a filter, a pump stripper and a grating pair compressor. The high-peak-power all-fiber femtosecond laser system based on GMN spectrum shaping technology can further amplify the broadband light source generated by the GMN technology, and introduces the spectrum shaping gain narrowing technology, so that the output energy and peak power of the laser system are improved while ensuring the output of the ultra-short pulse width femtosecond laser, and the application prospect of the gain management nonlinear amplification technology is widened.

A laser beam combining system, method and laser beam combining device, the system comprising a first optical path and a second optical path; the first optical path comprising a first wavelength selection element, a first frequency doubling element and a polarizer arranged in sequence along a first direction; the first direction being the initial transmission direction of a first laser beam emitted by a first laser; the second optical path comprising a second frequency doubling element, a second wavelength selection element and a third polarization adjustment element; the second frequency doubling element and the second wavelength selection element arranged in sequence along a second direction; the second wavelength selection element and the third polarization adjustment element arranged in sequence along a third direction; the specific angle being the angle at which the second frequency light coincides with the first frequency light after being reflected twice by the second wavelength selection element and the first wavelength selection element; the second direction being the initial transmission direction of the first laser beam emitted by the first laser; the third direction being the direction in which the second frequency light is reflected by the second wavelength selection element. The system enables high peak power output of two laser beams in time overlap.

The invention discloses a control method for generating pulse laser and a pulse laser. The control method comprises the following steps: continuously pumping a gain medium; in the inversion population accumulation process in the gain medium, the linear loss modulator is controlled to work in a first state, the loss of the resonant cavity is reduced to a first loss level through the first state, the pulse laser is driven by the first loss level to enter and undergo a relaxation oscillation process, and the inversion population is stabilized to a steady-state value; the steady-state value corresponds to a laser threshold value under the first loss level; and after the reversal particle number reaches a steady-state value, the linear loss modulator is controlled to be switched to a second state, the loss of the resonant cavity is reduced to a second loss level by the second state, and the resonant cavity is driven to emit pulse laser by the second loss level. According to the invention, relaxation oscillation is introduced into a laser generation process through active guidance of the linear loss modulator, and time domain noise is suppressed, so that a pulse with high peak power and high energy stability is formed.

According to the method and system for modifying the two-dimensional material through the laser and the two-dimensional material, the two-dimensional material to be machined is fixed to the electrode and leveled, the accuracy and stability of the relative position between the area to be modified and the laser focus in the subsequent laser machining process are guaranteed, and a solid foundation is laid for high-precision modification. Ultrafast laser parameters of an ultrafast laser are set, the requirement that the pulse width is larger than 1 ps is determined, and the unique cold machining mechanism of interaction of ultrafast laser and substances is fundamentally utilized; when ultrafast laser with the pulse width larger than 1ps acts on the two-dimensional material, laser energy is absorbed within the time scale far faster than material lattice thermal diffusion due to the extremely high peak power and the extremely short acting time of the ultrafast laser, the nonlinear absorption process is mainly triggered, and therefore accurate removal or modification of the material can be achieved with extremely small thermal influence, and the material can be effectively removed or modified. And melting, splashing and thermal damage caused by traditional long-pulse laser processing are avoided.

The invention discloses a large-energy inner cavity stimulated Raman laser based on a batten structure, and belongs to the technical field of lasers. The laser comprises a pumping source, a pumping shaping system, a mixed resonant cavity, a conventional laser medium with a lath structure, a polarization control element, an electro-optic Q-switching element, a stimulated Raman back cavity mirror and a stimulated Raman medium with a lath structure. The laser crystal and the Raman crystal both adopt lath structures, and are welded to the high-heat-dissipation-rate heat sink through gold plating on the upper and lower large surfaces, so that efficient heat dissipation and one-dimensional temperature field distribution are realized, and thermally induced birefringence and depolarization loss are effectively eliminated. The mixing cavity structure is a thermal stable cavity in the thickness direction and an unstable cavity in the width direction, high-efficiency stimulated Raman conversion is achieved by combining the high peak power characteristic in the cavity, the repetition frequency, the light beam quality, the output power and the single pulse energy are remarkably improved, and the laser is suitable for various Raman laser configurations.

The invention relates to a narrow pulse laser driving system, which relates to the technical field of laser driving, and comprises a main control circuit module, a signal generation and pulse shaping circuit module and a driving circuit module, wherein the main control circuit module obtains a control instruction and then sends the control instruction to the signal generation and pulse shaping circuit module; the signal generation and pulse shaping circuit module responds to the control instruction, generates a trigger signal and sends the trigger signal to the driving circuit module; the driving circuit module drives the laser diode to work according to the trigger signal; and in the driving circuit module, a shaping buffer circuit shapes and buffers the trigger signal to obtain a driving signal, and the wide bandgap semiconductor power switch tube switches the on-off state of the wide bandgap semiconductor power switch tube according to the on-off of the driving signal so as to control the on-off of the working current flowing through the laser diode. According to the invention, ultra-narrow laser pulses with high peak power and high repetition frequency can be stably generated, and low heat consumption can be realized.

The application belongs to the technical field of laser drilling, and provides a 5G ceramic medium filter femtosecond laser drilling device and method, which comprises a femtosecond laser, and a pulse energy adjusting and controlling system, a laser pulse shaping system and a laser rotary drilling system arranged on the light beam path of the femtosecond laser. The femtosecond laser is used as a drilling light beam, has the advantages of high peak power, short action time, low material processing threshold and micron-level focused light spot, etc., can avoid the melting of the 5G ceramic medium filter material, instantaneously change the material on the 5G ceramic medium filter into plasma and emit it away, realize drilling in a very short time when heat has no time to transfer between electrons and lattices in the 5G ceramic medium filter material, and avoid the generation of thermal effects.

The application discloses a kind of based on ambient air's multi-cavity nonlinear laser compression system and its debugging method, with solid as nonlinear medium, the technical problems of MPC high peak incident power limit and the overall equipment structure complexity of MPC inert gas as nonlinear medium are solved, wherein based on ambient air's multi-cavity nonlinear laser compression system includes front end seed source, half-wave plate, polarizing beam splitter, mode matching lens group, multi-cavity, collimating lens group and GTI mirror group;Mode matching lens group is Galileo telescope system, so that the laser spot size imported into multi-cavity is adapted with the spot size corresponding to the intrinsic mode of multi-cavity;Multi-cavity is based on ambient air as nonlinear medium, it includes first concave mirror, second concave mirror, first mirror and second mirror;Collimating lens group includes second convex lens and third convex lens, and the laser emitted by third convex lens enters GTI mirror group for dispersion compensation to the laser emitted by collimating lens group.