47 results about "Laser pulse width" patented technology

The invention discloses a laser-induced sound cross-medium communication method based on passive relay PWM modulation, and relates to the technical field of cross-medium communication. The method comprises the following steps: adjusting the laser pulse width of to-be-sent information, and carrying out PWM modulation to obtain a PWM sequence; inputting the modulation sequence into a laser driving control module, and driving a laser to emit a laser pulse signal with specific pulse width change; laser energy is focused on the surface of a passive relay material, and when laser pulses with different pulse widths act on the material, different numbers of sound signals can be excited and generated; a receiving end captures sound signals propagating across media through a hydrophone, and demodulates the sound signals according to a mapping relation between pulse width and the number of the sound signals; and finally, original information is restored, so that cross-medium communication from air to water is completed. According to the invention, PWM modulation is combined with a passive relay material, and the system has the remarkable advantages of no need of underwater power supply, simple structure, high reliability and the like.

The invention belongs to the technical field of photoelectricity, and relates to a detector moving laser irradiation damage assessment method and system. The evaluation method comprises the following steps: determining mobile laser parameters and detector structure material attribute parameters; constructing a detector solid heat transfer transient model; setting physical field boundary conditions of the solid heat transfer transient model and performing grid division; setting solver parameters, specifically, inputting the moving laser pulse width and the moving laser frequency into a pre-trained linear neural network model, and calculating by applying an expression of the model to obtain the solver parameters; and based on the solver parameters, solving the solid heat transfer transient model in the solver, judging the thermal damage condition of the detector by calling domain ordinary differential and differential algebraic equation modules, and if it is determined that the detector is damaged, calculating the damage area and volume of the detector to obtain the spatial distribution condition of the damage area of the detector.

The invention provides a laser pulse width broadening device and a laser system. The laser pulse width broadening device comprises a first lens array, a plurality of optical fibers with different lengths, a second lens array and a focusing lens, the plurality of optical fibers with different lengths have the same incident plane and emergent plane; the first lens array divides the laser beam; the segmented laser beams are respectively transmitted in a plurality of optical fibers with different lengths, and the plurality of optical fibers with different lengths respectively emit a plurality of light beams with different delays based on the optical path difference of the plurality of optical fibers with different lengths; the second lens array collimates a plurality of light beams with different delays; and a plurality of light beams with different delays pass through the focusing lens and then are superposed to obtain uniformly distributed light beams with target sizes. The lens array can be used for segmenting light beams and coupling the light beams into optical fibers to improve the utilization rate of the light beams. The pulse width is broadened by using the optical path difference of the optical fibers with different lengths; the micro-lens array is used for collimating the light beams, the focusing lens is used for overlapping the light spots, small light spots are formed, and follow-up shaping and light beam coupling are facilitated.

The invention discloses an ultrafast laser welding method for a ceramic reinforced aluminum matrix composite, and aims to solve the problems that an existing ceramic reinforced aluminum matrix composite connecting method is low in strength, and high-precision welding and micro-area welding are difficult to realize. The ultrafast laser welding method comprises the steps that firstly, the to-be-connected surface of a to-be-welded part of the ceramic reinforced aluminum matrix composite is ground and polished; secondly, the composite materials to be welded are assembled in a butt joint mode; and thirdly, ultrafast laser is used for aligning a welding seam of the to-be-welded accessory, the laser pulse width is controlled to be 20 fs to 10 ps, the laser power is 1 W to 100 W, the welding speed is 0.01 mm / s to 3 mm / s, the defocusing amount is-150 microns to 0 microns, and ultrafast laser welding is conducted by controlling the path and the pass. According to the ultrafast laser welding method, the aluminum matrix and the reinforced phase can be well inhibited from reacting to generate a brittle compound, a welding seam with high density is obtained, the joint strength is remarkably improved, and therefore welding with the precision of micron order and below and micro-area welding are achieved.

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.

The utility model discloses a femtosecond laser pulse width real -time monitoring device relates to optical instrument technical field, including main base plate, integral optical support module, integral optical support module is equipped with a plurality of, a plurality of integral optical support module is used for installing different optical elements, and optical elements include beam splitter, reflector, delay line and nonlinear crystal, and integral optical support module is vertically installed on main base plate through fixed peg, support stable clamping plate is formed with two clamping plates and is closed, and the round hole for clamping fixed peg is formed on support stable clamping plate, and both ends of support stable clamping plate are equipped with fixed hole, and the axial direction of fixed hole is perpendicular with the board face direction of support stable clamping plate, is used for further fixed integral optical support module group after clamping on main base plate. The utility model forms the door type frame structure through support stable clamping plate and makes a whole with a plurality of module, and the slight displacement and the shaking of each module top are restrained.

The invention discloses a low-repetition-frequency laser pointing stability improving device and method, and belongs to the field of lasers. According to the invention, the seed laser pulse of the MHz magnitude is used as the reference light to adjust the directivity of the light path, and compared with the main laser repetition frequency of the Hz magnitude, the sampling frequency of the subsequent directivity adjustment is greatly improved, so that the laser auto-collimation precision is improved. The use of the first shutter, the second shutter and the third shutter ensures the safety of the first detector and the second detector in the transmission process of the main laser when the energy difference between the main laser and the reference light is 9 orders of magnitude. The first detector images the first grating of the compressor to ensure that the positions of laser entering the compressor are the same, so that the consistency of laser pulse width and directivity can be ensured to a great extent, the second detector images the acting target to ensure that the acting positions are the same, and the stability of a subsequent radiation source is ensured. The laser directivity correction method is applied to laser directivity correction of hundred TW-level and PW-level lasers.

The application discloses a self-correlation instrument based on gallium oxide two-photon absorption ultraviolet femtosecond laser pulse width measurement, and belongs to the technical field of photoelectric regulation and control. The self-correlation instrument comprises a laser generating device, an optical delay system and a self-correlation signal acquisition device. The laser generating device is used for generating a first light beam and a second light beam. The optical delay system is connected with the laser generating device and is used for changing the time when the first light beam and the second light beam reach a sample to be measured. The self-correlation signal acquisition device is used for receiving two-photon photoelectric conversion signal change data caused by the sample to be measured being irradiated by the first light beam and the second light beam in sequence, and obtaining a self-correlation signal based on the two-photon photoelectric conversion signal change data. The application makes full use of the ultraviolet wave band absorption characteristics of gallium oxide to prepare an ultraviolet detector, and uses the self-correlation method to measure the photoelectric conversion signal generated by two-photon absorption of the gallium oxide ultraviolet detector to measure the pulse width of the 350-450 nm near-ultraviolet wave band femtosecond laser.

This invention relates to the field of laser ultrasonic nondestructive testing technology, specifically a method for optimizing laser source parameters during laser-induced ultrasound based on FEA (Feature-Enhanced Amplification). The invention obtains the geometric dimensions and material parameters of the insulator under test, constructs a geometric model, adds solid heat transfer and mechanical fields, and establishes a finite element model through thermal expansion coupling. Multiple laser pulse width and laser spot radius values ​​are determined and combined to obtain multiple parameter schemes. Each parameter scheme is applied to the finite element model as the time and spatial distribution parameters of the laser heat source, and transient calculations are performed. Displacement time-domain data of monitoring points are extracted and subjected to Fast Fourier Transform (FFT) to obtain frequency-domain data. The ultrasonic signal characteristics of each parameter scheme are compared and analyzed, and the parameter combination that meets the testing requirements is selected as the optimization result. This invention significantly reduces parameter optimization costs and improves testing efficiency through simulation-guided experiments.

The present invention belongs to the technical field of the interaction between laser and matter, and relates to a simulation method and system for the temperature field and stress field of a material irradiated by short-pulse laser. The simulation method includes: determining simulation parameters, including short-pulse laser irradiation parameters and material property parameters; constructing a thermo-mechanical coupling transient model of the material, and determining the boundary conditions of the heat transfer physical field and the solid mechanics physical field of the model; performing grid division on the thermo-mechanical coupling transient model, and configuring solver parameters; specifically: inputting the short-pulse laser pulse width and the short-pulse laser frequency into a pre-trained linear neural network model, and calculating to obtain the solver parameters; applying the solver to solve the thermo-mechanical coupling transient model to obtain the temperature field and stress field distribution of the material at different irradiation times. The simulation method of the present invention can comprehensively and accurately capture the complex transient physical process of the material under the action of short-pulse laser.

The invention relates to the technical field of material strengthening treatment, in particular to a gear surface laser strengthening method, a gear and a laser strengthening device. The method comprises the following steps that an obtained gear to be strengthened is divided into a plurality of areas to be strengthened, and the areas at least comprise a first area to be strengthened with the deformation smaller than a preset threshold value and a second area to be strengthened with the deformation larger than the preset threshold value during laser shock strengthening under the same condition; the divided first to-be-strengthened area and the divided second to-be-strengthened area are subjected to laser shock strengthening separately according to a preset first parameter set and a preset second parameter set; wherein the preset parameters of the first parameter group and the second parameter group comprise laser energy, laser pulse width and laser spot parameters, and each parameter value of the first parameter group is correspondingly greater than each parameter value of the second parameter group; the gear surface is subjected to laser strengthening through the gear surface laser strengthening method, and uniformity regulation and control of gear surface residual stress can be achieved to a certain extent.

The invention discloses a method for ultrafast laser welding of a ceramic reinforced aluminum-based composite material in a vacuum environment, and aims to solve the problems that high-precision welding and micro-area welding are difficult to realize by a traditional connection method of the existing ceramic reinforced aluminum-based composite material, the strength of a joint is limited by an ultrafast laser welding method, the thickness of a weldable workpiece is limited and the like. The ultrafast laser welding method in the vacuum environment comprises the steps that firstly, a to-be-connected face is ground and polished; secondly, the to-be-welded parts are assembled in a butt joint mode and placed in a vacuum cabin; 3, vacuumizing the vacuum chamber; and fourthly, ultrafast laser is aligned with the weld joint, the laser pulse width is controlled to be 200 fs to 10 ps, the laser power is 10 W to 120 W, the welding speed is 0.03 mm / s to 5 mm / s, and ultrafast laser welding is conducted. The obtained connector is almost free of welding deformation, the bending strength reaches 80% of that of base metal, high-precision welding and micro-area welding are achieved, meanwhile, the welding penetration depth can be effectively increased through the vacuum environment, and the thickness size range of weldable workpieces is enlarged.

The invention relates to a double-pulse modulation long-distance distributed optical fiber temperature sensing system which comprises a laser, laser output by the laser is transmitted to a grating and a first-stage laser modulator through a beam splitter, laser output by the first-stage laser modulator is transmitted to one port of a circulator through a first laser amplifier, and laser output by the second-stage laser modulator is transmitted to the other port of the circulator through a second laser amplifier. A lower port of the circulator is connected with the sensing optical fiber, a second lower port of the circulator is connected with the input end of the second laser amplifier, the grating and the output end of the second laser amplifier are connected with the signal processing module, and a second-level laser modulator is further arranged between the first-level laser modulator and the first laser amplifier. The laser pulse width output by the first-stage laser modulator is larger than that output by the second-stage laser modulator, and the first-stage laser modulator has laser intensity gain of at least one decibel. The dipulse modulation long-distance distributed optical fiber temperature sensing system provided by the invention has a relatively long detection distance under the condition that the resolution ratio is not reduced.

The present invention belongs to the field of optoelectronic technology and relates to a method and system for evaluating the damage of a detector caused by moving laser irradiation. The evaluation method includes: determining the parameters of the moving laser and the parameters of the detector's structural material properties; constructing a transient solid heat transfer model of the detector; setting the physical field boundary conditions of the transient solid heat transfer model and performing mesh division; setting the solver parameters, specifically: inputting the moving laser pulse width and the moving laser frequency into a pre-trained linear neural network model and using the expression of the model to calculate the solver parameters; based on the solver parameters, solving the transient solid heat transfer model in the solver, and determining the thermal damage condition of the detector by calling the domain ordinary differential and differential algebraic equation module. If it is determined that the detector has been damaged, calculate the damage area and volume of the detector to obtain the spatial distribution of the damaged area of the detector.

The invention provides a laser control system and a laser control method. The laser control system comprises a laser output device, a temperature sensor and a controller, and the output end of the laser output device is configured to be implanted into a target intervertebral disc; the temperature sensor is configured to be integrated at the output end of the laser output device and used for acquiring the real-time temperature in the target intervertebral disc; the controller is used for determining at least one of laser output parameters of the next laser pulse on the basis of the real-time temperature and / or the real-time temperature rise rate until it is determined that the actual total heat of the laser output device reaches the target total heat; the laser output parameters comprise laser pulse width, laser pulse frequency, peak power and average power. A closed-loop feedback system is established, and the difference between the actual total heat and the target total heat can be calculated according to the real-time temperature and the real-time heating rate, so that the parameters of the next laser pulse combination are dynamically adjusted, and the target repairing effect is accurately achieved.

The laser cleaning method for the oxide on the surface of the semiconductor comprises the steps that the semiconductor is placed in a negative-pressure vacuum chamber, and the surface of the semiconductor is located at the focal plane position of a laser pulser; the laser pulse frequency of the laser pulser is controlled to be 1 Hz to 200 Hz, and the laser pulse width of the laser pulser is controlled to be 0.1 ns to 100 ns; the average laser power of the laser pulser is controlled to be 100-1000W, and the laser energy density is controlled to be 0.1 J / cm < 2 >-2J / cm < 2 >. Compared with a traditional cleaning method, the method has the advantages that the treatment process is faster, higher surface cleaning quality is obtained, surface oxides of semiconductors are effectively removed, and secondary pollution to the environment is reduced.

The present application relates to a method, apparatus, device, and medium for measuring the performance parameters of a single-photon detector, which relates to the field of single-photon detection technology. The method includes: calculating and determining the total photon event count value within a first time domain range, calculating and determining the post-pulse event count value within a second time domain range, determining the post-pulse probability of each statistical sub-interval in a statistical histogram based on the post-pulse event count value and the total photon event count value, and determining the post-pulse probability of the single-photon detector to be measured based on the post-pulse probability of each statistical sub-interval; calculating and determining the first difference between the second peak time and the first peak time to determine the dead time of the single-photon detector to be measured; and calculating and determining the time jitter of the single-photon detector to be measured based on the laser pulse width, the time jitter of the synchronization pulse, and the time jitter of the multi-event statistical histogram time-to-digital converter. The present application greatly shortens the measurement time of the performance parameters of a single-photon detector.

The invention belongs to the field of laser ranging, and particularly relates to a semiconductor laser drive circuit, which is characterized in that in order to adapt to different power supply input characteristics, an input power supply is output to a filter circuit after passing through a voltage stabilizing circuit, and a secondary power supply is output to other unit circuits for use after noise and ripples are filtered by the filter circuit; the booster circuit provides driving voltage required for driving the laser; the numerical control circuit adjusts the amplitude of the driving circuit; the fixed width circuit is used for generating a laser driving signal with stable width; the trigger circuit is used for driving the semiconductor laser to output laser pulses. Compared with the prior art, low-cost, low-power-consumption and modular design is carried out on the semiconductor laser driving circuit in the semiconductor laser range finder, and the functions of obtaining a fixed-width laser driving signal through single-chip microcomputer driving, wide power input range, adjustable transmitting power and stable laser pulse width are achieved.

The manufacturing method of a laser pulse width shortening film according to the present invention includes: a filling step in which a graphene oxide colloid is filled into a container having an open upper surface; a covering step in which a guide film having a predetermined outer pattern perforated therein covers an opening of the container; a bonding step in which the graphene oxide colloid is filled into the inside of the outer pattern by the capillary principle; an agglomeration step in which a solvent of the graphene oxide colloid evaporates in the inside of the outer pattern to form a graphene film by agglomerating graphene oxide molecules; and a separation step in which at least the graphene film is separated from the guide film.

Systems and methods for optimizing laser damage threshold and induced phase change range in a method of writing phase change structures in a hydrogel material with a femtosecond laser writing system focusing a laser beam into the hydrogel material. A laser pulse width and a laser effective NA are selected for a given focused laser average power range to increase the laser damage threshold relative to use of laser pulse widths shorter than the selected laser pulse width and / or use of laser effective NAs greater than the selected laser effective NA. In a particular embodiment, the focused laser average power is from 1 to 5000 mW, the selected laser pulse width is greater than about 165 fs, and the selected laser effective NA is less than 0.50. Applications of the techniques described include laser induced refractive index change (LIRIC) customization of contact lenses, intra-ocular lenses, and other ophthalmic materials.

The invention provides a medical laser pulse width error measurement system which comprises a laser control and drive module, a laser, a PD detector and a pulse width error detection module. The pulse width error detection module comprises a first pulse width conversion circuit, a second pulse width conversion circuit, a modulation circuit and an operational amplifier circuit module, the laser control and driving module is electrically connected with the laser, and the PD detector is connected with the laser. A signal modulation circuit of the pulse width error detection module is electrically connected between the PD detector and the first pulse width conversion circuit, the first pulse width conversion circuit and the second pulse width conversion circuit are both electrically connected with the operational amplifier circuit module, and the laser control and drive module is electrically connected with the second pulse width conversion circuit. The deviation of the original pulse signal is finely adjusted according to the comparison result, so that the laser pulse error is controlled within the set 10%.

The invention relates to an underwater bubble super-infiltration metal base material and a nanosecond laser preparation method thereof, and the method comprises the steps: providing a metal base material, and cleaning the metal base material to obtain the cleaned metal base material; under a first preset laser parameter, utilizing nanosecond laser to carry out direct writing etching on the surface of the cleaned metal base material, processing a micro-nano composite structure, and obtaining the metal base material with the composite structure; the first preset laser parameters comprise the laser scanning speed, the laser scanning interval, the laser average power, the laser pulse frequency, the laser pulse width, the laser pulse wavelength and the machining mode; cleaning and drying the metal base material with the composite structure to obtain a dried metal base material; and the dried metal base material is immersed in a fluorosilane solution, drying is conducted after immersion is completed, and the underwater super-aerophilic metal base material is obtained. According to the preparation method, a stable self-supporting surface structure is achieved for gas-liquid separation, the preparation process is simple, the preparation efficiency is high, and the cost is low.

The invention discloses a terahertz optical fiber dispersion compensation device and method based on an optical switch, and belongs to the technical field of terahertz time-domain spectroscopy. The device comprises a femtosecond laser, a dispersion compensation optical fiber, a beam splitter, two paths of optical delay units, at least one optical switch, a plurality of groups of internal optical fiber jumpers with different lengths and an external optical fiber interface. The method is characterized by comprising the following steps of: presetting the maximum total length of a single-path optical fiber of a system, and determining a section of dispersion compensation optical fiber with fixed length according to the maximum total length; dividing the length of the external optical fiber into a plurality of gears, and configuring a corresponding length of the internal optical fiber patch cord for each gear, so that the sum of the two lengths is constantly equal to the maximum total length; the corresponding internal optical fiber patch cords are switched and gated through the optical switches, so that the total optical fiber length of the system is ensured to be constant when the length of the external optical fiber is changed, and the dispersion compensation optical fiber with the fixed length always realizes complete compensation. According to the invention, the automatic adaptation to the length change of the external optical fiber is realized, the femtosecond laser pulse width is effectively maintained, and the adaptability, the time domain resolution and the signal-to-noise ratio of the terahertz system are improved.

The application provides a self-correlation instrument optical system and a laser pulse width measuring device. The self-correlation instrument optical system comprises an optical path difference generating module, a self-correlation signal generating module and a self-correlation signal receiving module. The optical path difference generating module comprises an optical path adjusting sheet and a Fresnel double prism, which are used for dividing the laser to be measured into two beams of pulse laser with different delays and intersecting at a non-collinear included angle. The self-correlation signal generating module comprises a frequency doubling crystal and a filter sheet, which are used for frequency doubling conversion of the pulse laser, generation of a self-correlation signal and filtering. The self-correlation signal receiving module comprises a CCD module, which is used for receiving an intensity signal of the self-correlation signal and converting the intensity signal into a self-correlation function image for output. The self-correlation function image is used for calculating the pulse width of the laser to be measured through image analysis. The problems that the existing technology is difficult to build and the size of the non-collinear included angle is not easy to adjust due to the use of multiple mirrors are solved.

The invention relates to the technical field of microelectronic manufacturing, in particular to a Mini LED chip repairing device for display application, which comprises the steps of confirming a chip repairing device, performing an ablation test on a pre-constructed reference chip module based on the chip repairing device to obtain an ablation resistance index, a temperature diffusion coefficient and a temperature diffusion range, performing defect detection on the fixed display module by using an optical detection mechanism in the target repairing device to obtain a real defect coordinate set, and calculating target laser power according to a preset target ablation area, target laser pulse width and an ablation resistance index; and carrying out local ablation on the fixed display module based on the target repairing device, the to-be-repaired defect coordinate, the target laser pulse width and the target laser power to obtain a local ablated module, carrying out surface mounting repairing on the ablated display module to obtain a repaired display module, and completing repairing of the Mini LED chip. According to the invention, the automation degree and reliability of defect repair of the Mini LED backlight module can be improved, and the product yield is improved.

The invention provides a laser time-space characteristic detection system and method based on a scanning galvanometer, and the system can represent the time-domain characteristic and spatial distribution characteristic of incident laser at the same time at a time, especially key parameters such as spatial light intensity distribution and laser pulse width of the laser. Meanwhile, the light intensity of the laser passing through the electric small hole is measured in a point-by-point scanning mode, so that an imaging camera with a large target surface is not needed, the corresponding cost is greatly reduced, the time domain and space distribution characteristics of the laser can be accurately represented through the provided measurement method and the provided fitting model, and the measurement accuracy is improved. And the time-domain characteristics of pulse laser and continuous laser with the pulse width at different time scales can be represented.

The application belongs to the technical field of laser warning devices, and particularly relates to a multi-parameter binocular laser warning device for measuring the distance of an incoming laser target, wherein a light shield is arranged on a receiving window, a measuring laser wavelength and direction module, a measuring laser pulse width module and a measuring laser distance module are respectively arranged on the light path direction of the receiving window, and the measuring laser wavelength and direction module, the measuring laser pulse width module and the measuring laser distance module are electrically connected to a control and data processing module. The 0th and 1st light spots formed by grating diffraction are used for wavelength and angle measurement, the time interval of a laser pulse signal is measured to realize the pulse width measurement of the incoming laser, and the two 0th light spots imaged by two detectors are used for laser distance measurement and calculation, so as to realize the measurement of the wavelength, direction, pulse width and distance parameters of the incoming laser.

The embodiment of the invention belongs to the technical field of laser control of artificial intelligence, and relates to a laser control method, device and equipment for treating a lesion blood vessel and a medium, and the method comprises the steps: receiving to-be-processed blood vessel imaging data sent by a scanning terminal in real time; according to the to-be-processed blood vessel imaging data, obtaining the distribution characteristics and the blood vessel diameter of the target lesion blood vessel; performing data adjustment on the laser according to the blood vessel diameter of the target lesion blood vessel to obtain an adjusted focusing spot size, laser energy and laser pulse width; determining the moving direction and the moving position of the laser according to the distribution characteristics; and performing solidification treatment on the target lesion blood vessel by using the laser with the adjusted focusing spot size, laser energy and laser pulse width according to the moving direction and moving position of the laser through a laser galvanometer scanning technology. The laser penetrating power can be accurately controlled, the treatment accuracy of diseased tissues is improved, and the situation that normal tissues are mistakenly treated is avoided.

This utility model relates to the field of laser technology, specifically providing a laser pulse width calibration device. It includes a calibration circuit board, a seed laser, a photoelectric sensor, and a processor. The output terminal of the calibration circuit board is electrically connected to the input terminal of the seed laser, used to transmit an electrical trigger signal corresponding to the pulse width to the seed laser. The output terminal of the seed laser is connected to the input terminal of the photoelectric sensor, used to output an optical pulse signal corresponding to the pulse width. In the photoelectric sensor, a photoelectric converter converts the optical pulse signal output by the seed laser into a voltage signal. The input terminal of a multi-stage amplifier circuit is electrically connected to the output terminal of the photoelectric converter, used to amplify the voltage signal output by the photoelectric converter. The first input terminal of the processor is electrically connected to the output terminal of the photoelectric sensor, and the processor is used to check whether the bandwidth of the optical pulse signal meets the standard. This achieves automatic pulse width calibration, effectively improving calibration efficiency and stability.

This invention provides a high-precision ultraviolet laser control system and method based on pulse width modulation, belonging to the field of laser control technology. It includes an ultraviolet laser generation module, a pulse width modulation module, a laser driving module, and a system control and monitoring module. The ultraviolet laser generation module generates ultraviolet laser light. The pulse width modulation module receives an external trigger signal and generates an electrical pulse signal based on a preset target pulse width value. The laser driving module converts the electrical pulse signal into a driving current to drive the ultraviolet laser generation module. The system control and monitoring module sets the target pulse width and target energy values, monitors the output characteristics of the ultraviolet laser in real time, and adjusts the peak value of the electrical pulse signal or driving current based on the output characteristics of the ultraviolet laser. This invention achieves high-precision and high-stability control of the ultraviolet laser pulse width and energy by combining electrical pulse width modulation with closed-loop feedback.