21 results about "Laser pulse width" patented technology

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 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 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 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 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.

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.

This invention provides a method for die-cutting an electrode sheet. The method includes: setting laser die-cutting parameters based on the total thickness of the insulating layer, the laser die-cutting parameters including laser pulse width, laser power, laser frequency, and laser die-cutting speed; and controlling a laser beam to cut the insulating layer and at least a portion of the current collector coated with the insulating layer according to the set laser die-cutting parameters. Setting the laser die-cutting parameters includes: adjusting the laser power P and the total thickness T of the insulating layer to satisfy: P = P0 × (1 + k) n Where n is the number of thickness intervals, and n = (T - T0) / Δt; k is the laser power up-adjustment ratio of the nth interval, and 7% ≤ k ≤ 20%, Δt = 20 μm, where P0 is the laser power reference, and P0 = 180 kW; T0 is the thickness reference, and T0 = 20 μm. This invention provides a method for die-cutting an electrode, an electrode, and a cylindrical battery, to at least reduce or shorten the current collector burrs generated during electrode die-cutting.

The application provides an analysis method based on a pulse period number dominant laser wake field electron acceleration, comprising the following steps: fixing an initial laser normalized intensity, a laser pulse width and changing a laser wavelength, obtaining that different period number laser pulses excite electron density bubble structure in plasma and form a wake field capable of accelerating electrons; starting a laser wake field acceleration simulation, linearly polarized laser excites a bubble structure in plasma, multiple snapshots are taken for the evolution of the bubble structure, and bubble structure diagrams at different times are obtained; statistically analyzing the bubble structure diagrams at different times, obtaining the change of the bubble structure centroid transverse coordinate Δz c ; when the bubble centroid transverse coordinate change Δz c ≥0.01λ p0 , the laser carrier effect is dominant in the laser wake field acceleration process at this moment; otherwise, the mass dynamic effect is dominant. The method can provide analysis guidance for the wake field acceleration research driven by laser of different period numbers, has small calculation amount, is fast in calculation, and can provide a judgment result in real time.

The invention relates to a laser processing system and a laser processing method.The system comprises a processing platform, a laser emitting assembly, a light path adjusting assembly and a laser scanning assembly, the light path adjusting assembly is arranged between the processing platform and the laser emitting assembly, and the laser scanning assembly is arranged between the light path adjusting assembly and the processing platform; wherein the machining platform is used for bearing a to-be-machined workpiece and driving the to-be-machined workpiece to move; the laser emitting assembly is used for emitting first laser and second laser, and the laser pulse widths of the first laser and the second laser are different; the light path adjusting assembly is used for adjusting a light path of the first laser and / or the second laser, so that the first laser and the second laser generate spatial deviation at an incidence point on the laser scanning assembly; the laser scanning assembly is used for configuring the first laser and the second laser to execute the same scanning track on the workpiece to be machined. According to the technical scheme, the machining precision of the workpiece to be machined is improved while the machining efficiency is guaranteed.

The invention provides a laser ranging precision improving system and method based on an enhanced octane method. The laser ranging precision improving system based on the enhanced octane method comprises the steps that a timestamp is determined through a laser transmitter, an echo receiving array and a time-to-digital converter; the octuple subinterval positioning module uses an octuple subinterval positioning method to carry out rapid interval classification on timestamps and carry out iterative compression on a measurement range to generate subinterval boundary parameters; and the accumulation detection module performs histogram accumulation on the timestamps in the corresponding compressed time intervals according to the sub-interval boundary parameters, synchronizes photon counting accumulation at the sub-interval boundaries in combination with a boundary quantization sensing algorithm so as to eliminate classification errors, detects peak values and outputs flight time. And the laser pulse width is increased in the initial stage of the distance measurement stage through a PWM pulse width modulation module so as to improve the signal-to-noise ratio. Therefore, the measurement precision is improved while the system frame rate is ensured.

The invention relates to the technical field of laser ultrasonic nondestructive testing, in particular to an FEA-based laser light source parameter optimization method during laser excitation ultrasonic. The method comprises the following steps: acquiring geometric dimensions and material parameters of a post insulator to be detected, constructing a geometric model, adding a solid heat transfer physical field and a solid mechanical physical field, and establishing a finite element model through thermal expansion coupling; determining a plurality of laser pulse width values and laser spot radius values, combining the values to obtain a plurality of groups of parameter schemes, applying each parameter scheme as a time distribution parameter and a space distribution parameter of a laser heat source to the finite element model, and respectively performing transient calculation; extracting displacement time domain data of the monitoring points and performing fast Fourier transform to obtain frequency domain data; comparing and analyzing the ultrasonic signal characteristics of each group of parameter schemes, and selecting a parameter combination meeting the detection requirement as an optimization result. According to the method, through simulation guidance experiments, the parameter optimization cost is remarkably reduced, and the detection efficiency is improved.

The invention discloses a laser pulse width and integral window weak coupling flight time measurement system and method, and belongs to the technical field of single photon detection and integrated circuits. The method comprises the following steps: receiving single photon trigger event signals from SPAD pixels in a measurement interval, discretizing and counting the single photon trigger event signals to obtain global histogram data of the whole measurement interval, determining peak position information based on the global histogram data, determining histogram data of effective sub-intervals based on the peak position information, and calculating the single photon trigger event signals according to the histogram data of the effective sub-intervals. And carrying out differentiation recombination and linear combination operation on the histogram data to obtain an echo rising edge time index, generating complete flight time based on the initial index of the effective subinterval, the echo rising edge time index and an indirect flight time calculation formula, and converting the complete flight time into the target depth. According to the invention, the strong coupling limitation that the laser pulse width and the integral window need to be strictly matched in the traditional indirect time-of-flight technology is broken through, and high-precision distance measurement can be realized under the conditions of strong background light and wide dynamic range.

The present application relates to the technical field of microelectronic manufacturing, and a Mini LED chip repair device for display application, comprising: confirming the chip repair device, performing ablation test on a pre-constructed reference chip module based on the chip repair device to obtain an ablation resistance index, a temperature diffusion coefficient and a temperature diffusion range, performing defect detection on a fixed display module by using an optical detection mechanism in the target repair device to obtain a real defect coordinate set, calculating a target laser power according to a preset target ablation area, a target laser pulse width and the ablation resistance index, performing local ablation on the fixed display module based on the target repair device, the defect coordinates to be repaired, the target laser pulse width and the target laser power to obtain a local ablation module, performing mounting repair on the ablation display module to obtain a repaired display module, and completing the repair of the Mini LED chip. The present application can improve the automation degree and reliability of defect repair of the Mini LED backlight module and improve the product yield.

The invention relates to the technical field of skin laser treatment auxiliary robot systems based on artificial intelligence computer vision, and particularly discloses a skin laser treatment auxiliary robot system based on artificial intelligence computer vision. The system comprises a hyperspectral vision acquisition device, a skin biochemical characteristic analysis unit, a physical information neural network prediction engine, a laser parameter optimization controller and a laser execution mechanism, skin multilayer biochemical-optical characteristics are obtained through hyperspectral imaging, three-dimensional thermal field distribution is predicted in real time in combination with a generative artificial intelligence model embedded in physical prior, the laser pulse width, the spot diameter and the energy density are dynamically optimized, and cooperative control of focus precise treatment and epidermis safety protection is achieved. According to the technical scheme, the subcutaneous thermal injury process can be visually predicted, and the accuracy, safety and clinical adaptability of laser treatment are improved.

The application discloses a kind of laser pulse width broadening device and system, its device includes pulse broadening structure, main control circuit structure and pulse polarization conversion structure, pulse broadening structure is used to be connected with seed oscillator, receives the laser pulse output by seed oscillator, and laser pulse is transmitted multiple annular, to make laser pulse broadening;Main control circuit is used for monitoring the transmission time of laser pulse in annular pulse broadening structure, when monitoring the transmission time of laser pulse reaches preset transmission time, polarization control instruction is sent;Pulse polarization conversion structure is connected with annular pulse broadening structure and main control circuit structure, for receiving polarization control instruction and laser pulse, the polarization state of laser pulse after broadening is adjusted, and from the port not connected with pulse broadening structure is output.The application can reuse the broadening characteristics of CFBG in annular structure pulse broadening structure, and laser pulse can be transmitted multiple annular, to make laser pulse broadening.

The utility model discloses a femtosecond laser pulse width control device, comprising a light source module comprising a light source, a stretcher, an amplifier and a beam expanding collimation assembly which are successively arranged along a light path; the compression module is used for adjusting the pulse width and comprises a first reflecting mirror, a compressor and a second reflecting mirror, the compressor is used for compressing the pulse into a transformation limit pulse and comprises a first grating, a second grating, a climbing mirror and an adjusting mechanism, the first grating is located between the first reflecting mirror and the second reflecting mirror, and the second grating is located between the first reflecting mirror and the second reflecting mirror; the adjusting mechanism is used for adjusting the distance between the first grating and the second grating; the detection module comprises a polarization beam splitter, a frequency doubling crystal, a dichroic mirror and a power meter, and the power meter is used for detecting the power of the frequency doubling light; and the feedback control module is used for feeding back the power of the frequency doubling light and controlling the compression module. According to the utility model, the detection structure can be simplified, the equipment cost is reduced, and packaging in a standard industrial laser is easy to realize.