64 results about "Pulse energy" patented technology

In certain embodiments, an ophthalmic laser surgical system for treating a target tissue in an eye includes a target detection system and a laser device. The target tissue has an optical breakdown threshold. The target detection system directs detection beams along a detection beam path towards the target tissue in a vitreous of the eye, and determines a location of the target tissue within the vitreous. The laser device includes a femtosecond laser that generates subthreshold laser pulses that have a pulse energy below the optical breakdown threshold of the tissue. The laser device directs a laser beam comprising the subthreshold laser pulses along a laser beam path towards the target tissue.

The application provides a kind of preparation method of femtosecond laser-induced graphene microtaper based on pre-structure assistance, forms ablation pit pre-structure on the surface of polyimide by front femtosecond pulse, and the energy deposition of subsequent pulse is enhanced by using the multiple reflection and light trapping effect of the pre-structure, so as to realize the growth of graphene microtaper induced by heat-chemical-force coupling through the structure formation path of "ablation pit pre-structure-local light trapping-energy accumulation-microtaper growth". Therefore, the application utilizes the light trapping effect and local energy enhancement effect of ablation pit pre-structure to improve the energy deposition efficiency of subsequent laser pulse in local area, thereby facilitating the continuous carbonization reconstruction of material and the formation of three-dimensional microtaper.

This invention provides a method for eliminating bonding interface defects, a module for eliminating bonding interface defects, a semiconductor device processing apparatus, and a computer-readable storage medium. The method for eliminating bonding interface defects includes the following steps: locating at least one bubble defect on the bonding interface of a grain-wafer bond; and applying a pulsed high-energy beam from the grain side of the bonding interface to the at least one bubble defect to form at least one venting micro-via penetrating the corresponding grain above the bubble defect, wherein the peak power of the pulsed high-energy beam is not less than 10 kW, and its single-pulse energy is not greater than 1 mJ.

This invention discloses a high-repetition-rate interpolation amplification system, relating to the field of high-power laser technology. It employs a three-stage architecture of time-domain separation, parallel amplification, and polarization beam combining. The core idea is to distribute the thermal load and suppress the accumulation of nonlinear effects by interleaving pulses in the time domain, and then synergistically improve the overall performance of the system through incoherent polarization beam combining. Compared with traditional coherent combining schemes, this invention completely eliminates the dependence on precise phase control, extremely high synchronization accuracy, and strict waveform matching, thus providing a highly promising technical path for synchronously achieving high repetition rate, high single-pulse energy, and high average power laser output.

A multiple-pulses-in-air (MPiA) laser scanning system configured for measuring the time-of-flight of laser pulses, wherein the computing unit is configured for triggering the transmitter to transmit the send pulses with a varying pulse frequency, wherein the transmitter is configured to have a dead mode, wherein in the dead mode an increase in pulse frequency is effected, wherein in the course of increasing the pulse frequency, a reduction in pulse energy per individual send pulse of the send pulses is provided such that the pulse energy of the resulting return pulses is reduced such that it is below a detection threshold, and a measurement mode, wherein in the measurement mode a reduction in pulse frequency compared to the dead mode is effected.

This invention belongs to the field of laser processing, specifically relating to a method for preparing concentric ring micropores using a femtosecond Bessel beam for polymer thin films. The method includes: guiding a Bessel beam, consisting of a central core and multiple concentric rings surrounding it, onto the surface of a polymer thin film deposited on a transparent substrate; adjusting the single-pulse energy to selectively activate the central core of the Bessel beam, or a combination including the central core and one or more peripheral concentric rings, such that the energy density of the activated region exceeds the ablation threshold of the polymer thin film, thereby forming a micropore in the polymer thin film under the action of a single pulse; wherein the pore size of the micropore is determined by the activated central core or the combination thereof, and the micropore is a low aspect ratio hole with a depth substantially equal to the thickness of the polymer thin film, without damaging the transparent substrate. By controlling the activation of the concentric rings of the Bessel beam, the pore size and shape characteristics can be regulated.

This application provides a method for synchronously measuring blade tip clearance and vibration using dual-modal pulse fusion, relating to the field of blade health detection technology. The method includes the following steps: applying a dual-modal electrical pulse signal to a single capacitor or eddy current sensor probe mounted on the casing, driving the probe to emit an electromagnetic field towards the rotating blade; receiving the echo electrical pulse signal output by the sensor probe; a first processing branch generating a digital edge signal representing the pulse arrival time; a second processing branch outputting an analog voltage signal representing the pulse energy; acquiring the digital edge signal and recording its timestamp relative to the system clock, while simultaneously acquiring the analog voltage signal to obtain a digital amplitude value; calculating the amplitude and frequency of blade vibration based on the timestamp sequence corresponding to multiple consecutive pulses output by the same sensor probe; and simultaneously calculating the current blade tip clearance value based on the digital amplitude value.

The application relates to the technical field of mode-locked fiber lasers, and particularly discloses a method for improving the output power of a mode-locked fiber laser oscillation stage, which constructs a resonant cavity containing at least two gain units, a mode-locked unit and the like; initial gain is established by injecting pump light into a first gain unit, and then light is injected into a second gain unit to realize mode locking and power improvement; and parameters are adjusted to maintain stable output. The first gain unit reduces the mode-locking threshold, and the second gain unit improves the pulse energy; the two units are functionally separated and cooperated in the same cavity, and the nonlinear effect in the cavity is relieved. The application does not need a cavity amplification structure, can synchronously complete mode locking establishment and power improvement in the oscillation stage, breaks through the power bottleneck, takes into account stability and reliability, has good expansibility, and is suitable for multiple power levels and application scenarios.

This application provides a method for synchronously measuring blade tip clearance and vibration using dual-modal pulse fusion, relating to the field of blade health detection technology. The method includes the following steps: applying a dual-modal electrical pulse signal to a single capacitor or eddy current sensor probe mounted on the casing, driving the probe to emit an electromagnetic field towards the rotating blade; receiving the echo electrical pulse signal output by the sensor probe; a first processing branch generating a digital edge signal representing the pulse arrival time; a second processing branch outputting an analog voltage signal representing the pulse energy; acquiring the digital edge signal and recording its timestamp relative to the system clock, while simultaneously acquiring the analog voltage signal to obtain a digital amplitude value; calculating the amplitude and frequency of blade vibration based on the timestamp sequence corresponding to multiple consecutive pulses output by the same sensor probe; and simultaneously calculating the current blade tip clearance value based on the digital amplitude value.

The application discloses a digital loudspeaker volume control method, device, equipment and medium, relates to the loudspeaker technical field, and is used for solving the problems of quality reduction and complex manufacturing process in the prior art. The method comprises the following steps: receiving a volume adjustment instruction; determining an electric energy signal loaded to a loudspeaker unit in each quantized audio digital stream based on the volume adjustment instruction; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal; adjusting sound pulse energy output by the loudspeaker unit based on the electric energy amplitude or the electric energy action time, and completing volume adjustment. The scheme realizes volume control of digital sound production based on the electric energy amplitude or the electric energy action time, does not need a digital-analog converter, and does not need multiple transducing element hardware supports. On the basis of not increasing the number of rows of transducing elements, the electric signal energy loaded to the loudspeaker unit is controlled, so that the sound pulse energy output is controlled, and digital volume adjustment is realized.

A method of altering a refractive property of a crosslinked acrylic polymer material by irradiating the material with a high energy pulsed laser beam to change its refractive index. The method is used to alter the refractive property, and hence the optical power, of an implantable intraocular lens after implantation in the patient's eye. In some examples, the wavelength of the laser beam is in the far red and near IR range and the light is absorbed by the crosslinked acrylic polymer via two-photon absorption at high laser pulse energy. The method also includes designing laser beam scan patterns that compensate for effects of multiphone absorption such as a shift in the depth of the laser pulse absorption location, and compensate for effects caused by high laser pulse energy such as thermal lensing. The method can be used to form a Fresnel lens in the optical zone.

The application relates to the field of femtosecond laser pulse compression technology and discloses a femtosecond laser pulse compression method and system, the method of which comprises generating a femtosecond laser pulse to be compressed; interacting the femtosecond laser pulse with plasma to make the femtosecond laser pulse generate linear negative frequency chirp while expanding the spectrum of the femtosecond laser pulse; and performing positive dispersion compensation on the linear negative frequency chirp, so as to obtain a compressed femtosecond laser pulse. The application can solve the problems existing in the prior art, such as the laser pulse energy being limited by the damage threshold, poor spatial uniformity of the compressed light beam, high cost of compression elements, difficulty in realizing nanosecond pulse width and the like.

The application discloses a kind of multi-level pore structure aerogel based on pulsed laser and preparation method and application, belong to solar energy conversion and utilization technical field.It is inorganic material containing silicon nano as freezing base element, biomass polymer is crosslinking agent, deionized water is solvent, three are uniformly mixed and stand to form hydrogel after solidification, then freeze to form ice crystal, then remove ice crystal to form micron-nanometer level porous aerogel using freeze drying technology;Finally, the micron-nanometer level aerogel obtained is customized punched using pulsed laser technology Millimeter hole, finally obtain millimeter-micron-nanometer multi-level pore aerogel.The application first uses the high single-pulse energy of laser, and the customization optimization regulation and control of millimeter level hole of aerogel is not limited by the size and shape of template, and only through simple programming can realize the diversified design of millimeter hole, which is simple, stable in process and good in reproducibility.

The application discloses a microsecond interval double-pulse shock wave treatment circuit, a treatment instrument and a control method, wherein the circuit comprises a charging circuit, an energy storage circuit, a discharging circuit and a control circuit connected in sequence, the energy storage circuit comprises a first energy storage unit and a second energy storage unit, and the first energy storage unit stores more electric energy than the second energy storage unit; the discharging circuit comprises a treatment coil; and the control circuit is used for controlling the discharging circuit to release the electric energy stored in the first energy storage unit and the second energy storage unit in a predetermined order, so as to generate double-pulse shock waves with a time interval of 100 us to 1000 us. The application can realize accurate control of the double-pulse energy difference and the microsecond discharge timing, thereby being capable of actively regulating the cavitation effect in the treatment process, and effectively improving the treatment efficiency while ensuring the treatment safety.

The application discloses a kind of all-optical fiber non-invasive ultrasonic liquid level measurement system, it includes fiber-optic photoacoustic transducer array to convert light pulse energy into ultrasonic wave, to non-invasive in the container wall of liquid bearing liquid excitation ultrasonic vibration;Fiber Bragg grating senses ultrasonic vibration and vibration information is modulated into continuous probe light, forms reflected light signal;Optical circulator is oriented transmission to photoelectric converter reflected light signal;Photoelectric converter is converted into electrical signal reflected light signal;Signal acquisition and processing unit carries out synchronous sampling and analog-digital conversion to electrical signal, obtains digital ultrasonic time domain signal;Liquid level inversion unit carries out frequency domain transformation to digital ultrasonic time domain signal, extracts energy attenuation characteristic parameter in preset characteristic frequency band from frequency domain signal, and the liquid level height in container is calculated by the liquid level and ultrasonic energy attenuation quantitative model established in advance.The application realizes non-invasive high-precision liquid level measurement without damaging container structure, and improves measurement stability.

This application discloses a femtosecond laser process optimization method, apparatus, equipment, storage medium, and product, relating to the technical field of photomask repair. The method includes: acquiring the processing window size information of the area to be repaired; inputting dynamically generated candidate laser pulse energies and candidate pulse impact counts along with the processing window size information into a pre-trained line edge roughness prediction model to obtain the predicted line edge roughness; within a preset safety process constraint range, using an optimization algorithm to globally optimize the line edge roughness prediction model, with minimizing the predicted line edge roughness as the optimization objective, calculating the optimal combination of laser pulse energy and optimal pulse impact count; and outputting the optimal combination of laser pulse energy and optimal pulse impact count as recommended process parameters for the area to be repaired. This application achieves adaptive output of process parameters with optimal repair edge quality while avoiding material damage.

To provide a semiconductor device manufacturing method that can reduce the degradation of semiconductor device quality. [Solution] The laser irradiation process includes a first irradiation step of forming a plurality of modified portions in a sapphire substrate along a first direction. The first irradiation step includes a first step of forming a plurality of first modified portions along a first direction, and a second step of forming a plurality of second modified portions along a first direction after the first step, at a position closer to the second surface of the sapphire substrate than the first modified portions, and at a position that overlaps the first modified portions in a plan view. The amount of aberration correction of the laser light in the first step is smaller than the amount of aberration correction of the laser light in the second step, and the pulse energy of the laser light in the first step is smaller than the pulse energy of the laser light in the second step.

The present application belongs to the technical field of digital signal processing, and specifically provides a nuclear pulse amplitude extraction method based on parameter identification and a nuclear pulse analysis system, to solve the problem of the decrease in the accuracy of the energy spectrum diagram caused by the baseline drift and pulse pile-up rejection of the nuclear pulse signal, so as to improve the energy resolution and count rate of the nuclear pulse energy spectrum diagram. The present application can realize accurate capture and processing of the nuclear pulse signal, first uses a filtering method to process the original sampling sequence signal, reduces the influence of the baseline drift, then uses a parameter identification model to identify parameters and extract amplitudes of the pile-up pulses processed by the joint filtering method, and generates a high-precision spectrum diagram, so as to improve the energy resolution and count rate of the system, and provide strong technical support for the fields of nuclear physics research, nuclear energy application, and nuclear radiation detection.

A mid-infrared laser generation system based on dispersion-managed soliton bunch pulses. The system can achieve high-power, high-efficiency and high-proportion mid-infrared laser output, and has the advantages of an all-fiber configuration, a compact structure and a high power proportion in a longer-wavelength region of a mid-infrared spectrum. A pulsed fiber laser device generates a nanosecond pulse laser in a 1.5-micron band. A fiber pulse stretcher is made of a single-mode silica fiber, splits nanosecond pulses into a plurality of ultrafast soliton pulses by means of a nonlinear effect, and performs spectral energy conversion from 1.5 microns to 2.4 microns. A fiber laser amplifier further increases the output power of a stretched pulse laser and extends a spectrum to a 2.7-micron band, and also increases pulse energy beyond a 2.3-micron band. A fiber mode field adapter efficiently couples into a nonlinear fiber pulses generated in the fiber laser amplifier. The nonlinear fiber extends a laser to a mid-infrared 3-5-micron band, thereby achieving high-power, high-efficiency and high-proportion mid-infrared laser output.

The application relates to the field of femtosecond laser pulse compression technology and discloses a femtosecond laser pulse compression method and system, the method of which comprises generating a femtosecond laser pulse to be compressed; interacting the femtosecond laser pulse with plasma to make the femtosecond laser pulse generate linear negative frequency chirp while expanding the spectrum of the femtosecond laser pulse; and performing positive dispersion compensation on the linear negative frequency chirp, thereby obtaining a compressed femtosecond laser pulse. The application can solve the problems existing in the prior art, such as the laser pulse energy being limited by the damage threshold, the poor spatial uniformity of the compressed light beam, the high cost of compression elements, and the difficulty in realizing nanosecond pulse width.

Example embodiments relate to light detection and ranging (lidar) devices or other apparatus that incorporate laser light emitters capable of increased pulse energies and decreased pulse durations. These laser light emitters include a gain medium having two portions to which a pump electrode and a switch electrode, respectively, are coupled. The pump electrode is configured to apply a current through the gain medium that provides energy for lasing and the switch electrode is configured to apply a current through the gain medium that controls a transparency of the second portion of the gain medium. Thus the switch electrode, which controls the timing of emitted light pulses, can be driven by a lower current and thus have shorter pulse widths, rise time, and / or fall times, thereby allowing for shorter, higher-energy laser pulses to be emitted.

This invention relates to the field of laser technology, specifically to a hybrid MOPA laser system with tapered gain fiber pre-amplification. The system, along its optical path, sequentially comprises: an all-fiber pulse seed source, a uniform gain fiber pre-amplification link, a tapered gain fiber pre-amplifier module, a free-space optical transmission processing module, and a solid-state main amplifier module. The tapered gain fiber pre-amplifier module includes a pump LD, a pump / signal combiner, and a tapered gain fiber. This invention utilizes a tapered gain fiber as the pre-amplification core, combining the high stability and high repetition rate capability of an all-fiber structure with the high nonlinear threshold and high power output capability resulting from mode field spreading. It overcomes the shortcomings of traditional solid-state regenerative pre-amplification, such as poor stability and low repetition rate, as well as the power limitations of traditional uniform fiber pre-amplification, providing a high-quality, high-power injection beam for the subsequent solid-state main amplifier, ultimately achieving high beam quality, high repetition rate, high average power, and high pulse energy laser output.

This invention discloses an ASIC chip with an energy response self-calibration module, comprising a multi-pixel channel array containing N independent pixel channels. Each pixel channel includes a charge-sensitive amplifier module, a shaping circuit, a pulse energy discrimination module, and a counting module. The pulse energy discrimination module has a built-in comparator. The chip also includes an energy response self-calibration module, comprising a test pulse generator, a reference voltage control submodule, and a calibration logic control submodule. By controlling the pulse height and the magnitude of the reference voltage Vref, the S-curves of each pixel channel corresponding to different test pulse heights are obtained. Based on a preset calibration algorithm, the polynomial coefficients of the reference voltage and the calibrated DAC value for each pixel channel are calculated and stored. This invention enables consistent energy response across all pixel channels of the ASIC, and allows the calibration coefficients to be read after self-calibration to determine the differences between the ASIC channels.

An ophthalmic surgical laser system includes: a laser that produces a pulsed laser beam having a pulse energy and pulse repetition rate; a high frequency fast scanner; an XY-scan device; a Z-scan device; and a controller. The controller controls the high frequency scanner to produce a scan line having a scan width; controls the XY-scan device and the Z-scan device to carry out of first sweep of the scan line in a first sweep direction and to carry out a second sweep of the scan line in a second sweep direction that is not parallel to the first sweep direction thereby defining an overlap region. At least one of the pulse energy, repetition rate, XY-scan speed, and the scan width is varied so as to accelerate the cutting speed and reduce the exposure of ophthalmic tissue in the overlap region to multiple exposures of laser pulses configured to modify ophthalmic tissue.

This invention relates to the field of laser technology, and particularly to a Raman laser that outputs 9.2μm far-infrared laser light. It includes a laser pump beam splitting module, a first-order Raman laser generation module, a difference-frequency seed light preparation module, a laser beam combining and tuning module, a second-order Raman amplification module, and a laser collimation and separation module arranged sequentially along the optical path. The laser pump beam splitting module is used to achieve beam splitting and control of the 1064nm laser; the first-order Raman laser generation module is used to generate a 1.9μm first-order Raman laser from hydrogen; the difference-frequency seed light preparation module is used for difference-frequency preparation of the 9.2μm Raman seed light; the laser beam combining and tuning module is used for spatiotemporal overlap and beam combining of the pump light and the seed light; the second-order Raman amplification module is used for Raman amplification of the 9.2μm laser; and the laser collimation and separation module is used for collimation and separation of the target laser output. This invention utilizes a difference-frequency method to generate wavelength-matched far-infrared Raman seed light, and performs Raman amplification to ultimately obtain a 9.2μm far-infrared Raman laser with high pulse energy and high peak power.

This invention relates to the field of laser detection and navigation positioning technology, and discloses a real-time noise reduction and in-situ calibration system and method for laser ranging sensors. The system includes an acquisition module, an extraction unit, a mapping unit, a control unit, and a compensation unit. The system extracts the zero-position calibration pulse generated by reflection within the optical window, calculates the waveform asymmetry parameter to construct a timing compensation operator for the receiving link, and the control unit adjusts the measurement echo detection threshold according to the pulse energy distribution parameter. The compensation unit uses the operator to correct the target echo phase centroid and uses the real-time phase center of the pulse as the timing start anchor point. This invention converts the ranging reference from static setting to dynamic physical reconstruction, and synchronously eliminates clock temperature drift and circuit delay deviation caused by ambient temperature rise during the ranging cycle, thereby eliminating the cumulative error caused by spatiotemporal reference drift in long-distance navigation.

A wafer manufacturing method includes a separation layer forming step of forming a separation layer including a plurality of modified regions within a workpiece by moving the workpiece and a condensing point of a pulsed laser beam having a wavelength transmittable through the workpiece relative to each other at a predetermined speed along a processing feed direction in a state in which the workpiece is irradiated with the laser beam, and the condensing point of the laser beam is located at a predetermined depth position of the workpiece, and a separating step of separating a wafer from the workpiece with the separation layer as a starting point, in the separation layer forming step, a repetition frequency of the laser beam is set according to pulse energy and the relative predetermined speed between the workpiece and the condensing point such that the separation layer can be formed.

This invention discloses an acousto-optic Q-switching method for carbon dioxide lasers, specifically relating to the field of acousto-optic Q-switching of lasers. It addresses the problem that existing Q-switching control methods rely on fixed delays or single feedback, making it difficult to adapt to changes in discharge state, resulting in large pulse energy fluctuations and poor stability. By acquiring and segmenting the voltage and current waveforms within each discharge cycle, multi-dimensional features of the pre-ionization, main discharge, and relaxation stages are extracted to construct a full-cycle state vector. Based on this state vector, a timing prediction network is used to output the Q-switching turn-on delay and acousto-optic diffraction efficiency setpoints for the next cycle, achieving dynamic prediction and adaptive adjustment of Q-switching parameters. This improves the stability and consistency of laser pulse output, enhances peak power control accuracy and adaptability under different operating conditions, while reducing the reliance on manual experience for parameter tuning and improving the long-term reliability and robustness of the system.

This invention relates to the field of vertical high-gradient magnetic separation, specifically to a pulsed adaptive vertical high-gradient magnetic separator. The separator includes an extension tube disposed on the inner wall of the tailings hopper and communicating with the pulsed mechanism. The end of the extension tube away from the pulsed mechanism has a vertical structure, the upper end of which is the end of the extension tube away from the pulsed structure. The tailings hopper is filled with water, partially submerging the magnetic yoke located on the inner ring side of the vertical ring. The vertical projection of the vertical structure is located at the center of the vertical projection of the tailings hopper, and the upper end of the vertical structure extends to below the magnetic yoke located on the lower side of the vertical ring. This invention solves the problem in existing vertical ring high-gradient magnetic separators where the low frequency of water flow disturbance in the pulsed mechanism, attenuation of pulsed energy, and unidirectional disturbance direction lead to the ineffective separation of magnetic particles carrying non-magnetic particles.

The utility model discloses a coherent laser radar system based on quantum erasure, including laser emission module, five beam splitters, frequency shift module, optical amplifier module, circulator CIR, telescope, two -way balanced detector, first collimator, second collimator, reflector, polarization maintaining beam splitter, pump light source, two -way PPLN, filter, first single photon detector, second single photon detector and time correlation single photon counting module. Compared with prior art, the utility model introduces third frequency and realizes photon "disguise", and completes frequency conversion through periodic polarization lithium niobate waveguide, and only needs 14% pulse energy of conventional system to reach 16km wind speed detection, and energy efficiency improves 10 times. Realize the continuous detection of high -speed moving target. The system utilizes the frequency up conversion of the up conversion periodic polarization lithium niobate waveguide to realize the frequency up conversion, thereby realizing the indistinguishability of photon at the detector end.