109 results about "Pulse beam" patented technology

The invention discloses a time domain azimuth wide bunching imaging method based on sub-pulse diversity, and the method comprises the steps: constructing a multi-frequency sub-pulse wide bunching signal model, enabling different sub-pulse beams of a radar to point to different imaging regions, and obtaining a total echo signal received by the radar; according to the characteristics of a radar system, the pulse repetition frequency and synthetic aperture time of the radar are designed; and based on the pulse repetition frequency and synthetic aperture time of the radar, performing wide-range bunching imaging processing on the total echo signal received by the radar to obtain a complete image with large azimuth imaging breadth. According to the invention, the single pulse of the radar is divided into a plurality of sub-pulses, and the different sub-pulses point to different azimuth positions, so that the radar has the azimuth wide bunching capability; the application of a sub-pulse diversity technology in an imaging system is effectively realized, and the problems of high operation complexity and distance resolution loss of a scene edge part of a method for applying a frequency scanning radar to an azimuth array are solved.

The invention discloses an electron beam bunch superposition method and device, and the beam bunch energy of the head part and the tail part of an electron beam bunch is different by adopting a beam energy absorption effect. And then a plurality of alpha magnets are utilized, so that the movement path of the high-energy beam bunches at the head of the beam bunch string is long, the movement path of the low-energy beam bunches at the tail of the beam bunch string is short, and longitudinal superposition and compression of the beam bunch string are achieved. And the alpha magnet can simultaneously realize an achromatic function, so that the transmission envelope after the beam bunch is compressed and superposed is not greatly increased. And the obtained shorter pulse beam can be used for scientific research application such as nuclear data measurement.

The invention provides a multi-focus pulse light beam parallel processing method and system based on space beam splitting, and relates to the technical field of semiconductor material laser processing, and the method comprises the steps that a laser generator emits pulse laser to a SiC crystal ingot; the light path adjusting unit performs beam splitting and modulation on the pulse laser to obtain multiple beams of sub-pulse laser; the spatial light modulator performs spherical aberration compensation on the multiple beams of sub-pulse laser, performs phase modulation on the sub-pulse laser by adopting a hologram method to generate various target light fields, and modulates the target light fields in real time by switching holograms to obtain multi-focus pulse laser; the laser processing head unit is used for focusing multi-focus pulse laser in the SiC crystal ingot to set the depth; and the motion base station controls the SiC crystal ingot and the multi-focus pulse laser to perform relative motion and adjusts the relative position between the SiC crystal ingot and the laser processing head unit, scanning processing of the SiC crystal ingot is completed on a preset depth and a preset advancing route, and finally a processed wafer is obtained.

The invention provides a spectral response difference-based etching paste material quality detection method and system. The method comprises the following steps of: decomposing and identifying an internal density abrupt change boundary position of a material through multiband spectral chromatography; applying a light beam with a specific frequency to a sudden change boundary to perform resonance excitation to reconstruct stress field distribution, determining a stress concentration point, performing reverse optical tracking to form a defect path, and establishing a self-organizing optical monitoring grid; performing density self-adaptive adjustment on the grids, and forming a graded spectrum fingerprint database through differential spectrum excitation to generate a material state boundary recognition standard; phase change critical point detection is carried out based on an identification standard, and a pulse light beam is applied to excite surface deformation to construct a multi-point linkage defect blocking network; and performing defect analysis on the network to form an interconnected optical energy field, monitoring the energy field to determine an abnormal position, and performing phase comparison marking through a phase difference spectrum group to complete quality detection of the etching paste material, so that accurate identification and intelligent quality classification of internal defects of the material are realized.

The invention provides a radiation inspection system which comprises a plurality of scanning devices, the plurality of scanning devices are arranged around an inspection channel so as to scan an inspected object in the inspection channel from different angles, each scanning device comprises a radiation source, a flywheel and a back scattering detector, and the radiation source, the flywheel and the back scattering detector are matched with each other so as to scan the inspected object in the inspection channel. Flying spot back scattering scanning is carried out on the detected object, the ray sources of the scanning devices carry out pulse beam output according to the preset beam output frequencies of the scanning devices, and the beam output time of the ray sources of the scanning devices is staggered, so that the ray sources of the scanning devices do not output beams at the same time. Therefore, a plurality of scanning devices can conveniently carry out flying spot back scattering scanning on the detected object at different times.

The present invention relates to a pulsed beam control system for treating degenerative brain diseases and, to a technique for precisely controlling irradiation intensity, pulse width, period, irradiation angle and the like of radiation in order to provide patient-customized radiation therapy. More specifically, the present invention includes the system which concentrates radiation at a lesion site and which can minimize radiation exposure to adjacent normal tissue through real-time dose monitoring and distance measurement.

This application provides an inertial measurement method and system based on atomic interferometry. The method includes: controlling a first atomic beam and a second atomic beam to exit into an interference region, and sequentially interacting with three pulse beams in the interference region to detect the corresponding momentum transfer probability signals. The exit directions of the first and second atomic beams intersect and are symmetrical about the quantization axis. The effective pulse vector directions of the three pulse beams are adjusted so that the adjusted effective pulse vector directions are opposite to those of the original three pulse beams. The first and second atomic beams are then controlled to exit into the interference region, and sequentially interact with the adjusted three pulse beams in the interference region to detect the corresponding momentum transfer probability signals. Based on the four momentum transfer probability signals, the inertial measurement result is determined. Thus, by reversing the effective pulse vector direction, the interference area is reversed, effectively suppressing noise and drift terms unrelated to the effective pulse vector direction.

In order to provide a gas cluster ion beam apparatus capable of performing unprecedented high-precision trimming processing by generating a high-speed and high-precision pulse beam and adjusting the pulse width, pulse period, and the like thereof, a switching circuit including a switching device 32 is provided. The switching device 32 is arranged in a power line that supplies a voltage from an ionization power supply 30 for accelerating ionized hot electrons of the ionizer 5 to the ionizer 5 and an anode bar 17 having an equal potential to the ionizer 5. A gas cluster ion beam can be intermittently irradiated onto a substrate (15) to be irradiated, wherein a switching circuit (SWC) controls the on and off of a switching device (32).

The aerosol generating product comprises a shell, the heating body, a fluid aerosol generating substrate and a pulse bundle guide piece, the pulse bundle guide piece comprises a main body part, a hollow cavity is formed in the main body part, the heating body is arranged in the hollow cavity, and the fluid aerosol generating substrate is arranged in the hollow cavity. The axis of the heating body is consistent with the axial direction of the hollow cavity, and the heating body is perpendicular to the bottom of the shell. A liquid path channel is formed between the fluid aerosol generating substrate and the pulse bundle guide piece; the pulse bundle guide piece comprises plant veins, and the pulse bundle guide piece takes air as a medium or is in direct contact with the heating body for heat exchange to generate aerosol; the invention further discloses an aerosol generating device comprising the heating body. According to the aerosol generating product containing the heating body, the vein bundle guide piece is made from veins of plants to conduct the fluid aerosol generating matrix, the aerosol generating product is healthy, baking fragrance can be provided when the vein bundle guide piece is heated, and the user experience feeling is close to that of cigarettes.

A laser processing apparatus provides a laser unit, a vibration mirror module, a focusing module, and a processing platform. The laser unit emits a laser pulse beam. The vibration mirror module, positioned on the path of the laser pulse beam, reflects the laser pulse beam and has a first mode and a second mode configured to reflect the laser pulse beam into a first beam while the module is in the first mode or alternatively, into a second beam while the module is in the second mode. The first beam and the second beam travel in different directions. The focusing module receives the second beam reflected by the vibration mirror module in the second mode and focuses the second beam onto a focus. The processing platform is positioned at the focus to bear a to-be-processed device, upon which the second beam is cast.

The invention discloses a quantum secure direct communication method and system based on a passive decoy state, an information receiver uses two coherent pulses with random phases, and the two coherent pulses are interfered and attenuated through a beam splitter to generate weak coherent pulse beams with random intensity. And the information receiver randomly encodes the weak coherent pulse and sends the weak coherent pulse to the information sender. And the information sender carries out information coding and then sends the photon pulse to the information receiver. And the information receiver decodes according to the pulse information initially sent by the information receiver and restores the information sent by the information sender. The method does not need to actively modulate the intensity of the light source, can realize a passive decoy state, can be realized by using a linear optical device, simplifies the experiment operation, resists the side channel attack of a third-party eavesdropper to the light source modulator, and can enhance the security of quantum secure direct communication.

The subject matter of this specification can be implemented in, among other things, a system that includes a first light source to produce a pulsed beam and a second light source to produce a continuous beam, a modulator to impart a modulation to the second beam, and an optical interface subsystem to transmit the pulsed beam and the continuous beam to an outside environment and to detect a plurality of signals reflected from the outside environment. The system further includes one or more circuits configured to identify associations of various reflected pulsed signals, used to detect distance to various objects in the environment, with correct reflected continuous signals, used to detect velocities of the objects. The one or more circuits identify the associations based on the modulation of the detected continuous signals.

An atmospheric aerosol detection laser radar for dual-channel data acquisition is characterized by comprising an optical system and a photoelectric detection system, wherein the optical system emits laser pulse beams to the atmosphere and receives backward echoes generated by atmospheric aerosol to the emitted laser pulse beams, and the photoelectric detection system processes the backward scattering echoes received by the optical system. The two signal acquisition channels are controlled by the time controller to adopt different acquisition starting moments, so that higher vertical resolution detection capability for the atmospheric aerosol is realized, and support is provided for high-spatial resolution vertical profile detection of the atmospheric aerosol near the ground and near a cloud layer.

This invention belongs to the technical field of fluorescence lifetime measurement, and discloses a fluorescence lifetime measurement method and system based on time-gated fluorescence imaging. The method includes: acquiring multiple frames of fluorescence images of a sample, wherein the frame rate is greater than the pulse frequency of the pulse beam, and the frame rate and pulse frequency are not integer multiples of each other; the phase difference between two fluorescence images is a delay difference between the sampling delay of the two fluorescence images and their respective reference times; the reference time of each fluorescence image is the on-time of the pulse beam corresponding to its acquisition; calculating the average gray level of the fluorescence images; arranging the average gray levels within multiple pulse beam periods according to the sampling delay to obtain a time-gated sequence of average gray level variation with sampling delay; and obtaining the fluorescence lifetime of the sample by data fitting based on the time-gated sequence. Based on this method, the complexity and cost of detection can be reduced, and the limitations on application scenarios can be lessened.

There is provided a positron source (10; 1000) for generating a positron beam (180), wherein the positron source (10; 1000) includes: a laser arrangement (50) configured to generate a pulsed beam (70) of photons; a target (30) configured to receive the beam (70) of photons, wherein the target (30) is arranged for the photons of the beam (70) to generate a photon plasma at a surface layer (40) of the target (30), wherein the surface layer (40) is configured to preferentially absorb electrons from the photon plasma to generate corresponding free positrons; and an electrode arrangement (160) comprising one or more electrodes (160A, 160B, 160C) that are configured to apply an electric field to the photon plasma to extract the free positrons therefrom and to guide the positrons to form the positron beam (180). At least the target (30) and the electrode arrangement (160) are included within a vacuum chamber (20) configured in use to provide a vacuum condition in which the target (30) and the electrode arrangement (160) are arranged to function. Optionally, the surface layer (40) is configured to include a doped semiconductor material for providing the surface layer (40). More optionally, the doped semiconductor includes at least one of: p-doped Silicon, p-doped Gallium Arsenide, p-doped Graphene, Graphene, p-doped Silicon Carbide.

Systems and methods for initializing an extreme ultraviolet (EUV) source are discussed. The EUV radiation source may include a droplet generator configured to generate a stream of droplets of a target material, a laser source communicatively coupled to a controller. The laser source is configured to generate a first pulsed beam of light, which upon interaction with a droplet, initiates a modification of a shape of the droplet, forming a modified droplet, and generate a second pulsed beam of light configured to substantially evaporate the modified droplet, thereby generating pulses of EUV light. The EUV radiation source comprises a first actuator communicatively coupled to the controller and configured to adjust a width of the second pulsed beam to minimize a variation of energy of the pulses of EUV light.

The invention discloses a carving machining method and system based on vector pulse laser, and belongs to the technical field of laser carving, the carving machining method based on the vector pulse laser comprises the steps that linear polarization femtosecond pulse laser is split into femtosecond pre-pulse laser and picosecond main pulse laser; adjusting the pulse time delay between the femtosecond pre-pulse laser and the picosecond main pulse laser; combining the femtosecond pre-pulse laser and the picosecond main pulse laser after delay regulation and control; the femtosecond pre-pulse laser is converted into an angularly polarized femtosecond pre-pulse light beam, the picosecond main pulse laser is converted into a radially polarized picosecond main pulse light beam, and a double-pulse light beam combination of the angularly polarized femtosecond pre-pulse light beam and the radially polarized picosecond main pulse light beam is formed; and the to-be-machined workpiece is ablated and engraved through the double-pulse light beam combination. And by means of the synergistic effect of double pulses and precise time delay, the width and fusion damage of a heat affected zone are remarkably reduced, and high-precision and low-damage carving machining is achieved.

In a time region in which a beam array region passes through a mesh region of interest to be subjected to temperature calculation, the method for calculating the effective temperature of the mesh region of interest accumulates the amount of temperature increase supplied to the mesh region of interest by a plurality of unit heat source regions around the mesh region of interest, and calculates the effective temperature of the mesh region of interest. For each unit heat source region, a plurality of observation times, which are the irradiation end times of the tracking cycle in a time region in which the beam array region passes through the mesh region of interest, are observed. On the basis of the total irradiation time of the unit heat source region, the time from the start of irradiation to the unit heat source region to the observation time, and the distance from the unit heat source region to the mesh region of interest, the amount of temperature increase supplied to the mesh region of interest is obtained, the amount of temperature increase is accumulated, and the accumulated values corresponding to the plurality of observation times are averaged to obtain an average value. An effective temperature of the grid region of interest is calculated. Time integration of the temperature is performed using a time structure in which the irradiation of the multi-charged particle beam is a pulse-shaped beam irradiation having a tracking cycle as a period.

The invention discloses an ultrafast electronic pulse width measuring system and method based on time amplification fringe scanning. The problems that when the pulse width of an ultra-short electronic pulse is measured through an existing pulse width measurement technology, the measurement requirement for the length of an ultra-fast electronic pulse bunch with the electronic pulse width smaller than 100 femtoseconds is difficult to meet, the measurement precision is low, a measurement system is complex, and the cost is high are solved. According to the method, a time broadening effect is generated by utilizing a space charge effect and a vacuum dispersion effect of femtosecond-order ultrafast electronic pulse, the ultrafast electronic pulse is broadened to a picosecond order which can be detected by a traditional stripe scanning method, and the time broadening amount of the electronic pulse can be obtained by utilizing a space-time broadening theory; the pulse width of the broadened ultrafast electronic pulse is obtained through a stripe scanning deflection method, and the pulse width of the ultrafast electronic pulse can be obtained through inversion; the method provided by the invention can be used for accurately characterizing the femtosecond-order ultrafast electronic pulse ground pulse, and is high in time resolution, simple in system principle and easy to implement.

This invention discloses a device for real-time analysis of multidimensional information of spatiotemporally mode-locked pulses using an all-fiber structure, belonging to the field of ultrafast optics technology. It includes an all-fiber spatiotemporally mode-locked laser platform, a raw pulse beam profile measurement module, an optical circulator, a sub-pulse beam profile measurement module, and a dispersive Fourier transform and real-time spectral information detection module. Based on the generalized multimode nonlinear Schrödinger equation, this invention constructs a theoretical model of the spatiotemporally mode-locked laser, explores the multidimensional parameter coupling mechanism during spatiotemporal mode-locking, clarifies the mapping relationship between modes and frequencies, and provides a theoretical basis and method for high-precision mode differentiation and multidimensional real-time information extraction. This invention aims to rationally design the parameters of each fiber grating according to the spectral width and temporal interval of the spatiotemporally mode-locked pulse, reflecting more sub-pulses while ensuring that the pulse temporal domains do not overlap, achieving high-precision spatial mode resolution, and maximizing pulse broadening to obtain high-resolution real-time spectral information.

The invention relates to an optical scanner for detecting objects in a monitoring area, comprising a two-dimensional scanner, a light transmitter for emitting a pulsed beam of light into the monitoring area, a detector for detecting light pulses reflected from an object in the monitoring area, and a continuously rotatable rotating mirror for pivoting the direction of transmission of the beam of light over a polar angle, a continuously rotatable rotor on which at least the light transmitter, the detector, and the rotating mirror are arranged for pivoting the direction of transmission of the beam of light over an azimuthal angle, a stator relative to which the rotor is rotatable about an axis of rotation, and a control and evaluation unit.The optical scanner is characterized by the fact that an optical separation device is arranged between the light transmitter and the detector to suppress optical crosstalk from the light transmitter to the detector, and by a device for contactless transmission of data and energy between the rotor and the stator.

The present invention discloses a method for obtaining the energy spectrum and angular distribution of a deuterium-tritium neutron source. The method adopts a D-T neutron radiation field measurement system based on a SiC detector, can simultaneously measure the companion particles of the two reactions, can distinguish them in the energy spectrum, and obtain the counting rates of alpha particles and protons; takes into account the influence of the D-D reaction caused by target deposition in the D-T reaction, obtains the energy spectrum and angular distribution of the D-T and D-D neutron sources, and effectively improves the accuracy of the energy spectrum and angular distribution; the method of the present invention has no requirements for target tube-related parameters such as a pipeline and a grating for the companion particles, is simple to operate, only needs to measure a set of data to obtain the energy spectrum distribution in the entire space, does not need to measure different angles one by one, and can measure all D-T neutron sources; and the method of the present invention can be applied to a DC beam or pulsed beam D-T accelerator neutron source with a reserved companion particle channel, especially when there is deuterium beam deposition on the target, and can more accurately obtain the energy spectrum and angular distribution of the D-T neutron source.

The invention discloses a beam transformer and an installation method thereof. The beam transformer comprises a first flange, a second flange, an annular magnetic core coil, a ceramic gap ring and a circumferential plate capacitor. A mounting groove is formed between the first flange and the second flange, and the annular magnetic core coil, the circumferential plate capacitor and the ceramic gap ring are arranged in the mounting groove; the circumferential plate capacitor is arranged between the annular magnetic core coil and the ceramic gap ring; wherein the circumferential plate capacitor is arranged on the outer circumference of the ceramic gap ring. By adopting the technical scheme, the interference of high-frequency interference signals on the measurement of the microampere-level weak-current strong pulse beam is eliminated by using the circumferential plate capacitor, the accuracy and the reliability of detecting the intensity of the particle beam are improved, and the measurement of the intensity of the microampere-level pulse beam in a strong electromagnetic interference environment is realized.

A circularly polarized light irradiator capable of high-speed and high-sensitivity circular dichroism measurement is provided, as well as an analytical apparatus and microscope using the circularly polarized light irradiator. The analytical apparatus and microscope using the circularly polarized light irradiator include: a light source (20) that emits pulsed light; a polarization separation unit that separates the pulsed light (L1) emitted from the light source (20) or linearly polarized light (L2) extracted from the pulsed light (L1) emitted from the light source (20) into an x-axis polarized light component (L2x) and a y-axis polarized light component (L2y); and a light delay unit (13) that delays the pulsed light of the separated x-axis polarized light component. The pulses (Px) and (Py) of the y-axis polarized light components are delayed relative to the other; the polarization light combining unit coaxially combines the X-polarized pulse beam (L2x) and the Y-polarized pulse beam (L2y) emitted from the light delay unit (13) to generate a linearly polarized beam (L3) with alternating repeating X-polarized light pulses (Px) and Y-polarized light pulses (Py); and the polarization light conversion unit converts the linearly polarized light emitted from the polarization light combining unit into circularly polarized light.

An illumination source includes a droplet generator, a laser, a detector, and a controller. The droplet generator produces a stream of droplets of target material directed to an interaction region. The laser irradiates the droplets at the interaction region using a beam of pulses. The irradiated droplets generate output illumination of the illumination source. The detector measures an aspect of an interaction between a pulse from the beam and a droplet from the stream. Controller includes circuitry and determines a pulse timing adjustment that is nonlinearly dependent on the measured aspect. The controller also controls a subsequent laser pulse of the beam based on the pulse timing adjustment.

The invention discloses a high-current pulse ion beam extraction device for an ECR ion source, and the device comprises an ion source magnet which is used for providing a magnetic field, and the middle part of the ion source magnet is provided with a through hole in the axial direction; the plasma arc cavity is inserted into the through hole of the ion source magnet, and the injection end of the plasma arc cavity is provided with a gas inlet and a microwave feed inlet; the plasma electrode is arranged at the leading-out end of the plasma arc cavity, the plasma electrode inwards extends into the plasma arc cavity to form a section of cylindrical structure, and a beam leading-out hole is formed in an inner cavity of the cylindrical structure; and the pulse coil is wound outside the cylindrical structure of the plasma electrode, and the pulse coil is configured to form a magnetic field with the direction opposite to that of an extraction magnetic field of the ion source magnet so as to weaken the peak intensity of the extraction magnetic field. According to the invention, the intensity of the pulse beam led out by the ECR ion source can be obviously improved, so that the performance of the heavy ion accelerator is further improved, and powerful support is provided for the development of the heavy ion accelerator.

The present invention relates to wafer inspection. The present invention discloses a system configured to inspect a wafer, the system comprising an illumination subsystem configured to direct a first of a plurality of pulsed light beams by the illumination subsystem to an area on the wafer earlier in time than directing a second of the plurality of pulsed light beams to the area; a scanning subsystem configured to scan the plurality of pulsed light beams across the wafer; a light collection subsystem configured to image light scattered from the area on the wafer to one or more sensors; and a computer subsystem configured to use the output of the one or more sensors to detect defects on the wafer. The system of the present invention can optimize inspection speed and / or sensitivity.

The invention discloses a quantum secure direct communication method based on a symmetric all-passive light source, and the method comprises the steps: an information receiver uses four coherent pulses with random phases, generates weak coherent pulse beams with random intensity and random quantum states through the interference, beam combination and attenuation of a beam splitter and a polarization beam splitter, and transmits the weak coherent pulse beams to an information transmitter; and the information sender sends the photon pulse to the information receiver after coding. And the information receiver decodes according to the pulse information initially sent by the information receiver and restores the information sent by the information sender. According to the method, the intensity of the light source and the quantum state do not need to be actively modulated, the passive decoy state and the passive coding can be realized at the same time, the experimental operation can be simplified, the side channel attack of a third-party eavesdropper on the light source modulator can be resisted, and the security of quantum secure direct communication is enhanced.

A system for and method of controlling the characteristics a pulsed beam of EUV radiation, for example by controlling one or both of the spatial extent of a plasma generated at the primary focus of the collector optics to produce the EUV radiation or the size and / or shape of an aperture at the intermediate focus of the collector optics.

The application relates to a GIS component detection method and system based on laser ultrasound, and belongs to the technical field of nondestructive testing. The method comprises the following steps: emitting a pulsed laser beam to a GIS component to be detected, obtaining an ultrasonic echo signal generated by the GIS component to be detected based on the pulsed laser beam; extracting sum-frequency double power spectrum and difference-frequency double power spectrum in the ultrasonic echo signal by using a frequency spectrum screening method; obtaining the nonlinearity of the GIS component to be detected based on the ratio of the sum-frequency double power spectrum and the difference-frequency double power spectrum; if the nonlinearity of the GIS component to be detected is greater than a preset threshold, it is determined that the GIS component to be detected has defects; and if the nonlinearity of the GIS component to be detected is less than or equal to the preset threshold, it is determined that the GIS component to be detected has no defects. The application can judge whether the GIS component has defects by analyzing sum-frequency components and difference-frequency components in the ultrasonic echo signal generated by the GIS component under the excitation of a laser pulsed beam, and has high sensitivity and resolution.