29 results about "Nanosecond" patented technology

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

This invention discloses a deep-ultraviolet nanosecond-gated Raman and LIBS detection system and method for suspended soil particulate matter nutrients, belonging to the field of optical and smart agriculture sensor technology. The system includes: a laser ejection sampling unit for in-situ soil ablation to generate aerosols; an optical tweezers unit for capturing and suspending individual soil particles; a deep-ultraviolet laser excitation unit for emitting nanosecond dual-pulse lasers to excite the same particle to generate Raman and LIBS signals; a spatial heterodyne spectral interferometry imaging unit for slitless, high-throughput coaxial signal collection and the formation of interference fringes; and a timing control unit for time-division multiplexing detection of Raman and LIBS signals through nanosecond gating. This invention eliminates matrix effects and achieves highly sensitive in-situ, non-destructive, and synergistic detection of atomic and molecular information in single soil particles. Furthermore, Raman and LIBS are used to distinguish the organic content and total composition of nitrogen, phosphorus, and potassium, enabling precise quantification of soil nutrients.

A laser-plasma synergistic surface treatment method for CFRP / titanium alloy heterojunctions belongs to the field of heteromaterial bonding technology. First, nanosecond pulsed lasers are used to etch the surfaces of CFRP and titanium alloy to be bonded, constructing a micro-nano composite structure. Then, atmospheric pressure cold plasma is used to activate the etched surfaces, grafting polar functional groups. Finally, the two are bonded and cured using an adhesive. This invention achieves a dual enhancement effect of "mechanical interlocking" and "chemical bonding" by organically combining "laser etching to construct micro-nano physical structures" and "plasma activation to introduce chemical functional groups," significantly improving the interfacial bonding strength of CFRP / titanium alloy heterojunctions. Compared with single treatment methods, this invention can increase the joint shear strength by more than 38%, and the failure mode changes from interfacial failure to cohesive failure. It has advantages such as environmentally friendly process, good controllability, and significant effects, and has broad application prospects in aerospace, high-end equipment manufacturing, and other fields.

The application discloses a kind of ferrite gyromagnetic nonlinear loss transient response theoretical model and parameter simulation method under vertical pumping configuration, belong to microwave technical field, including the following steps: obtaining ferrite material parameters and target excitation microwave signal parameters, signal parameter at least includes microwave signal frequency, pulse width tau;Pulse width dependent function for representing consistent precession magnetic moment and the coupling strength of non-consistent precession magnetic moment (spin wave) is constructed.In view of this, the application first establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau) in the theoretical framework of vertical pumping configuration, establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau).The model can accurately describe the nonlinear effect of ferrite under nanosecond transient pulse excitation, and the dynamic law of the excitation condition and the change of pulse width.For the design of ferrite limiter device facing high-power microwave electromagnetic environment, important theory and design basis are provided.

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.

TITLE: Device and method for very precise pointing of a decoy source. Device for very precise pointing of a decoy source comprising one or more galaxies of geolocation satellites regularly emitting, for each satellite, a wave train, three GNSS antennas arranged more than one meter apart, said antennas forming a planar triangle, the three heights of said triangle each having a length greater than one meter, said three antennas being positioned on the aircraft in such a way that they receive the signals emitted by the geolocation satellites, a means of comparing, for each selected satellite and at each instant, the time difference values ​​allowing to determine, if these time difference values ​​are respectively substantially equal to a predetermined value, greater than a few tens of nanoseconds,and in this case to determine that the signals sent by this satellite are not spoofed, and that otherwise the signals sent by this satellite are spoofed, a calculation method allowing precise targeting of the spoofing satellite, in the case where the method has determined that the selected satellite is spoofed, by constructing a trihedron with the antennas as its base and a point as its vertex indicating the direction of the spoofing satellite. Figure for the abbreviation: Figure 1,

This invention discloses a time-division multiplexing system for power generation and controllable space electromagnetic pulse radiation based on a conductive tether, belonging to the field of aerospace electric tether technology. The invention uses a single retractable conductive tether as the core carrier and adopts a time-division multiplexing topology. A fully integrated radiation-resistant solid-state switch array within the cabin achieves physical-level electrical isolation and nanosecond-level disconnect-before-make switching between power generation and pulse radiation modes. The controllable space electromagnetic pulse radiation is actively excited high-energy pulse radiation, with high-energy nanosecond-level electromagnetic pulses actively injected through a pulse emission module, significantly increasing radiation power and possessing practical value for electromagnetic passivation of space debris. In power generation mode, the tether and space plasma form a closed loop to cut the geomagnetic field and generate electricity. In pulse radiation mode, the tether acts as an end-fed directional long-line antenna radiating electromagnetic pulses. Active sheath control stabilizes the sheath potential and suppresses losses. Radio frequency isolation achieves electrical decoupling between the cabin section and the radiation section, and the mode switching timing does not depend on the plasma's millisecond-level relaxation response, avoiding the risks of mutual exclusion and self-interference. This invention resolves the fundamental conflict between single-strand conductive tether power generation and pulsed radiation. It exhibits strong dynamic stability and meets electromagnetic compatibility standards. The core components are based on on-orbit verification technologies such as TSS-1R, PMG, and T-Rex, making it highly feasible for engineering applications. It can be applied to aerospace scenarios such as satellite on-orbit operation and maintenance and space debris management.

The application provides an organic-inorganic hybrid lead-based halide perovskite material and a preparation method and application thereof. The organic-inorganic hybrid lead-based halide perovskite material has a one-dimensional face-sharing perovskite structure or a quasi-one-dimensional face-sharing perovskite structure, and a chemical general formula of the organic-inorganic hybrid lead-based halide perovskite material is APbX3, A includes an alkyl-substituted triphenylphosphine cation, and X is at least one of halogen elements. The organic-inorganic hybrid lead-based halide perovskite material provided by the application has a one-dimensional or quasi-one-dimensional face-sharing perovskite structure under a specific component composition, can simultaneously realize material properties of no self-absorption and nanosecond-level ultrafast self-trapped exciton emission, has a large Stokes shift, breaks through the traditional STE ''slow decay'' fixed limit, has a high X-ray absorption capacity, has low detection limit and high spatial resolution, and is suitable for low-dose and high-resolution imaging.

The present application relates to a kind of hexagonal boron nitride atomic level manufacturing method and device based on controllable micro-explosion, belong to two-dimensional material and atomic level precision manufacturing technical field.The present application uses boron-nitrogen energetic compound as boron-nitrogen-energy integration precursor, under the restraint of array type nanometer limited microcavity, by nanosecond pulse quasi-molecular laser synchronous triggering controllable micro-explosion, combined with boron nitride metasomasis growth template and directional uniform electric field, realize nanosecond boron-nitrogen atom directional self-assembly, prepare high-quality single-layer / few-layer hexagonal boron nitride;And by millisecond laser annealing and high-purity nitrogen gas passivation repair lattice defect.The present application compresses the preparation cycle of single-chip 8 inch wafer hexagonal boron nitride to 10 minutes, and the comprehensive energy consumption is only 1% below traditional CVD process, can accurately control layer number and defect density, 100% compatible with existing semiconductor production line, suitable for the large-scale manufacturing of third-generation semiconductor devices, radio frequency devices, flexible electronics and other fields.

This invention discloses a 1030 nm soliton-type pulsed F-P cavity femtosecond fiber oscillator, comprising: a mode-locked oscillator cavity, a pump source, a moving mechanism, and a seed source control module; the mode-locked oscillator cavity includes a chirped fiber Bragg grating, a ytterbium-doped fiber, a wavelength division multiplexing (WDM) synthesizer, a beam splitter, and a semiconductor saturable absorber (SESAM); the pump source is connected to the pump port of the WDM synthesizer, the signal port of the WDM synthesizer is connected to the ytterbium-doped fiber and the first end of the beam splitter respectively, and the ytterbium-doped fiber is connected to the chirped fiber Bragg grating; the second end of the beam splitter is connected to the semiconductor saturable absorber (SESAM); by changing the optical path layout of each device in the oscillator, the pump light coupling direction is reversed to avoid interference of the pump light to the SESAM; the mode-locked feedback signal is analyzed in real time by an FPGA, and the pump current adjustment and SESAM switching action are dynamically coordinated to ensure the power stability of the pump source and the synergistic optimization of the SESAM operating point, so that the seed source is in the optimal mode-locked state during long-term operation.

The present disclosure relates to a light source system suitable for use in a time of flight camera. The light source system includes a light source, such as a laser, and a driver arranged to supply a drive current to the light source to turn the light source on to emit light. The driver includes two transistors coupled to the light source in series, such that when both transistors are turned on, a drive circuit is completed, current flows and the light source turns on. A very short pulse of light emission may be achieved efficiently by switching one of the transistors to the on-state to complete the drive circuit and a short time later turning off the other transistor in order to break the drive circuit. In this way, a pulse of light in the order of less than 1 nanosecond or less than 500 picoseconds may be achieved.

An anti-interference ultra-high time-resolution laser diagnostic method and device, belonging to the field of laser diagnostic technology, utilizes an ultra-high-speed wavelength modulation device with a GHz bandwidth to achieve GHz-level wavelength modulation of the laser output light, thereby improving the time resolution of laser diagnostics from the existing hundreds of kHz level to the GHz level, reaching the nanosecond level of detection. It can accurately capture the rapid evolution process of combustion and explosion flow fields at the nanosecond to microsecond scale, filling the technological gap in ultra-high-speed detection of nanosecond-level combustion and explosion flow fields. By mixing and filtering to extract multiple harmonic signals and performing ratio normalization processing on the harmonic signals, the influence of various interference factors such as light intensity fluctuations, radiation background, particle / droplet extinction, and signal scattering attenuation is fundamentally eliminated, obtaining a stable absorption characteristic signal independent of light intensity changes. This solves the problems of signal submersion and spectral distortion in traditional optical measurements in strongly disturbed combustion and explosion environments, and can work stably in extremely complex combustion and explosion flow fields.

The application provides a junction barrier wide energy detection range semiconductor electron detector and an imaging method, and belongs to the technical field of semiconductor detectors and electronic imaging. The device is a vertical stacked structure, and sequentially comprises, from bottom to top, a first electrode, a semiconductor substrate layer, a semiconductor epitaxial layer and a second electrode. The first electrode is used for forming electrical interconnection with an external circuit. The semiconductor substrate layer is arranged on the first electrode and is used as a support layer and a back contact layer of the device. The semiconductor epitaxial layer is grown on the semiconductor substrate layer, and the semiconductor epitaxial layer is composed of at least one layer of non-intentionally doped high-purity epitaxial layer. The second electrode is deposited on the surface of the semiconductor epitaxial layer and forms a Schottky contact. The semiconductor electron detector can realize ultra-low dark current at an extremely low working bias, nanosecond-level fast response, and can realize the separation imaging of SE and BSE signals flexibly by adjusting the bias.

This invention provides a laser-modified anti-corrosion method for the surface of a magnesium alloy phosphate film, comprising a nanosecond pulsed fiber laser, a pulsed laser beam, a magnesium alloy, a phosphate film, and a motion control platform. The method involves first preparing a manganese-based phosphate film on the magnesium alloy surface, then placing it on the motion control platform, and irradiating the phosphate film using a pulsed laser beam with specific parameters output from the nanosecond pulsed fiber laser. Finally, an epoxy primer is coated onto the modified surface. Under the ultrafast photothermal effect of the laser energy density, the loose hydrated phosphate undergoes in-situ dehydration and reconstructs into a dense anhydrous oxide layer, eliminating micropores and cracks. This invention significantly improves the hydrophilicity of the film surface, transforming the bonding mechanism between the film and the epoxy primer from a simple physical anchoring to a physicochemical synergistic bonding, greatly enhancing the geometric shielding effect and interface locking effect, achieving a substantial leap in the corrosion resistance of the magnesium alloy and the adhesion of the multilayer coating system.

A method for creating a visual iridescence effect on the surface of a part (1), in which a laser beam (7), with a pulse duration of less than one nanosecond, is directed onto said surface within the optical field of the focusing system (12) of a device comprising a laser source (6), a scanner (11) and said focusing system (12), so as to impart to said surface, over the width of said pulse, a structure in the form of wavelets having the same orientation, and a scan of said surface is performed by said scanner (11) with said laser radiation (7) along a series of successive lines (14, 15, 16), or a matrix of points, the width of each line (14, 15, 16) or the dimension of each point of each matrix being equal to the diameter of said pulse, by means of a relative displacement of said surface and the device emitting said laser beam, characterized in that between the completion of the scan along two lines (14, 15,16) consecutive or two adjacent points, the polarization of the laser beam (7) is modified to create wavelets of different orientations on two successive lines (14, 15, 16) or two adjacent points. Devices for implementing this process, and the part thus obtained.

The application relates to the technical field of particle acceleration, and particularly discloses a high-repetition nanosecond beam pulsing system and method, wherein the high-repetition nanosecond beam pulsing system comprises, in sequence along a beam transmission direction, a direct current ion source, a low-energy beam transmission section, a radio frequency quadrupole field accelerator, a high-energy beam transmission section and a target chamber, adopts a three-stage structure of 'front-end pulsing + middle-stage acceleration + rear-end purification', and is helpful to stably realize high-repetition, nanosecond narrow pulse width output; through pre-chopping and post-bunching, the pulse width is ensured, and invalid particles are reduced to enter a subsequent acceleration channel; the working frequency of the radio frequency chopper is half of the target pulse repetition frequency, the difficulty of synchronous control can be reduced, time sequence accuracy and phase synchronization can be ensured, beam loss and phase disorder can be avoided, pulse time sequence consistency can be ensured, and beam utilization rate can be improved; and the high-repetition nanosecond beam pulsing is stably ensured.

In some embodiments, an optical communication system may include a light source, a modulator, and an optical receiver. The light source may be configured to generate a beam comprising a series of light pulses. The optical receiver may have a detection window duration of 1 nanosecond or less. As the first pulse travels through a variable refractive medium, photons in the first pulse may be refracted, thus traveling along different ray paths to reach the optical receiver according to a time distribution curve. The full width at half maximum (FWHM) value of the time distribution curve may be greater than the coherence time value of the first pulse, and the detection window of the optical receiver may be greater than the FWHM value of the time distribution curve.

This invention relates to an atomic-level manufacturing method and apparatus for two-dimensional transition metal chalcogenides based on controllable micro-explosions, belonging to the field of two-dimensional semiconductor materials and atomic-level precision manufacturing technology. This invention uses energetic transition metal complexes and energetic chalcogenides as integrated metal-energy precursors. Under the constraint of an array-type nano-confined microcavity, controllable micro-explosions are synchronously triggered by nanosecond lasers. Combined with directional templates and a uniform electric field, nanosecond-level stoichiometric precision is achieved in the directional self-assembly of two-dimensional transition metal chalcogenides. This invention compresses the fabrication cycle of a single 8-inch wafer to less than 10 minutes, with overall energy consumption less than 1% of traditional CVD processes. It allows for precise control of the number of layers and crystal orientation, and the carrier mobility of the prepared material is 100% compatible with existing semiconductor production lines, making it suitable for large-scale manufacturing in fields such as advanced logic chips, photodetectors, and energy storage devices.

This invention relates to a method for residual stress reduction in high-frequency alternating current combined with nanosecond pulsed laser cleaning. The method includes the following steps: preparing a workpiece to be cleaned and connecting a high-frequency AC power supply to the workpiece; preheating the workpiece to 150-300°C based on the Joule heating and skin effect of the pulsed current; performing nanosecond laser scanning cleaning on the focal plane of the workpiece based on a predetermined scanning path; increasing the peak current density of the power supply to achieve dislocation slip and residual stress release based on the electroplastic effect, and reducing the surface temperature of the workpiece to below 200°C; and turning off the power supply and air-cooling the workpiece to room temperature. This invention not only effectively removes contaminants from metal surfaces and significantly inhibits secondary oxidation, but also precisely controls the thermal effects generated in the cleaning area. By effectively controlling the distribution of residual stress on the surface through high-frequency alternating current, it effectively improves the fatigue performance of metal materials after laser cleaning, thereby achieving a highly efficient and non-destructive laser cleaning technology.

This invention discloses a method for generating entanglement in a hybrid quantum system based on geometric phase. The method first constructs a hybrid quantum system containing superconducting transporter qubits, semiconductor spin qubits, and a surface acoustic wave resonator. Virtual phonons within the resonator serve as quantum transducers, and the system is placed in a dispersive region to achieve effective coupling between two qubits. Then, based on non-adiabatic geometric phase manipulation, a three-segment driving pulse sequence is designed to form an entanglement gate. Finally, the amplitude and phase of the driving field are controlled to accumulate the geometric phase and generate a high-fidelity entangled state. This invention achieves compact on-chip integration of the hybrid system, forming an entanglement gate with a fidelity ≥0.96 within 100 nanoseconds, achieving a quantum state transfer fidelity of over 0.966. It exhibits excellent robustness to parameter fluctuations and environmental dissipation. The scheme is easy to implement and scalable to similar hybrid quantum systems, providing technical support for scalable quantum information processing.

This invention belongs to the field of laser processing technology and discloses a control method based on the co-frequency coupling enhancement of electric pulses and nanosecond lasers, including: S1. setting the process parameters of the electric pulse device to 1 / f The current density is J S1. The electrical pulse device is activated and applied to the target workpiece; S2. The electrical pulse device continues to operate. t 1+ n / f Then, the nanosecond laser equipment is activated, and the target workpiece is simultaneously subjected to individual laser shock treatment; S3. Wait t 2+ n / f Then shut down the electrical pulse device; S4. Use the workpiece robot to move the workpiece along the predetermined circular path. r S5. Waiting n / f After the specified time, restart the electrical pulse device and repeat steps S1-S5; S6. Complete all pulse laser counts. m This completes all processing. The present invention achieves uniform strengthening of the material by driving the emission of a nanosecond pulsed laser during the application of a pulsed current, allowing both the electrical pulse and the laser to act simultaneously on the material.

Improved resolution of a time-varying optical image is provided with a wide field optical intensity modulator having a bandwidth greater than that of the detector array(s). The modulator configuration can have high photon collection efficiency, e.g. by using polarization modulation to split the incident light into several timegated channels.

The application provides a nanosecond micro-impulse generation method for chip electrostatic tolerance, relates to the technical field of detection systems, and establishes a low-energy linear channel model and a segmented nonlinear channel model of a triggered electrostatic protection clamp for a target test port of a measured chip, discretely decomposes a pre-distortion excitation instruction into a charge packet sequence containing a charge amount parameter, an energy parameter and a release time parameter, injects and forms a nanosecond micro-impulse waveform according to the release time, performs wideband sampling on port voltage and current, obtains an actual port waveform based on double-model inversion compensation, calculates an error, and updates the charge packet sequence in a closed loop until convergence output is obtained, meanwhile, port impedance and leakage response criterion extraction are realized through a pre-processing section, a main impulse section and a latch detection section, which are used for distinguishing soft breakdown and hard breakdown and generating a multi-port sensitivity distribution, and the method has the characteristics of controllable, reproducible and traceable waveform.

This invention belongs to the field of photoacoustic transduction technology, specifically relating to a transceiver integrated fiber optic photoacoustic transducer and fiber optic hydrophone device. The device includes a fiber optic photoacoustic transducer and a fiber optic hydrophone. The fiber optic photoacoustic transducer comprises a nanosecond pulsed laser, a lens, a fan-in / fan-out module, and a dual-core optical fiber. A trapezoidal slot is formed on one side of the dual-core optical fiber, and an absorption layer is uniformly filled within the slot. Each core of the dual-core optical fiber is an independent single-mode fiber, and one of the single-mode fibers is connected to the nanosecond pulsed laser via the fan-in / fan-out module. The nanosecond pulsed laser has a wavelength of 532 nm, a pulse width of 10-200 ns, a repetition frequency of 1-100 kHz, and a power of 400-800 mW. This invention integrates the transmission and reception of ultrasonic signals onto a single optical fiber, achieving integrated transmission and reception simultaneously. In the optical path, the acoustic signal generated by the transducer does not affect the hydrophone.

The application discloses a nanosecond pulse laser driving control device and method, relates to the technical field of nanosecond pulse lasers, and comprises a main control module connected with a digital-analog conversion module, a direct digital synthesizer module, a reference operation and current monitoring module, a signal output selection module and a signal coupling and current monitoring module respectively; the reference operation and current monitoring module is connected with the digital-analog conversion module; a pulse signal generation and conditioning module is connected with the direct digital synthesizer module and the signal output selection module respectively; the signal coupling and current monitoring module is connected with the signal output selection module; the reference operation and current monitoring module and the signal coupling and current monitoring module are connected with a target nanosecond pulse laser, and the application can improve the stability and reliability in the driving control process of the target nanosecond pulse laser.

The method for synchronously measuring the thickness and velocity field of a water droplet under plasma excitation provided by this invention belongs to the technical field of synchronous measurement of water droplet thickness and velocity. It employs a synchronous measurement system consisting of a signal generator, a high-speed camera, a nanosecond flash lamp, and a projection optical path. The signal generator controls the high-speed camera to acquire a first image illuminated by the nanosecond flash lamp and containing tracer particles at time t1. At time t1+Δt, the high-speed camera acquires a second image projected by the projection optical path. This process is repeated alternately, recording the images on odd-numbered and even-numbered image sequences of the high-speed camera. Cross-correlation analysis and projection analysis are performed on these sequences, and the results are coupled with the continuity equation to achieve spatiotemporal synchronous measurement of the thickness and velocity fields within the same water droplet.