20 results about "Picosecond pulsed laser" patented technology

The invention discloses a full-automatic high-flux space-time resolution fluorescence spectrum imaging system and method, and relates to the field of fluorescence signal spectrum. Comprising a working table, a sample table, an objective lens, a mechanical arm sample injection module used for grabbing the sample table loaded with a sample in advance and placing the sample table on the working table, and a picosecond pulse laser output module used for outputting a laser beam to the objective lens, the fluorescence signal detection module and the control module are used for simultaneously collecting spectral data and dynamic data of a fluorescence signal generated after the sample is focused by the laser beam; the sample table and the objective lens are sequentially arranged on the workbench at intervals in the vertical direction from top to bottom; the mechanical arm sampling module, the picosecond pulse laser output module and the fluorescence signal detection module are respectively in communication connection with the control module. According to the invention, simultaneous acquisition of spectrum data and dynamic data of fluorescence signals can be fully automatically realized.

The invention discloses a perovskite thin film, a photoelectric device and a method for improving the surface quality of the perovskite thin film. The method for improving the surface quality of the perovskite thin film comprises the following steps: S1, preparing the perovskite thin film; s2, performing picosecond pulse laser surface polishing treatment; and S3, guanidine ion implantation and repair: applying a guanidine salt solution to the surface of the perovskite thin film, removing the redundant guanidine salt solution on the surface of the perovskite thin film after the guanidine ions are implanted into the surface of the perovskite thin film, and then carrying out annealing treatment. According to the method, the surface of the perovskite thin film is polished through the picosecond pulse laser, the roughness of the surface of the perovskite is effectively reduced, a surface layer rich in defects is removed, guanidine ions are selectively implanted again through a multi-A-site vacancy structure formed on the surface of the perovskite thin film subjected to laser polishing, multiple hydrogen bonds are formed through the guanidine ions and a perovskite framework, and the surface roughness of the perovskite thin film is effectively reduced. And deep and stable defect passivation and lattice strengthening are realized, and the high-quality perovskite thin film with smooth surface, low defect density and high stability is obtained.

The invention discloses a welding method for titanium alloy thick plates, and relates to the technical field of laser welding, and the method comprises the following steps: placing a plurality of titanium alloy thick plates to be welded on a workbench, carrying out backing welding on backing welding areas of the titanium alloy thick plates to be welded, and carrying out continuous laser processing through picosecond pulse laser, reciprocating motion is conducted in the molten pool and the forging area; after the backing welding process is finished, a first laser wire filling welding area and a second laser wire filling welding area between different titanium alloy thick plates to be welded are welded in a laser wire filling welding mode, in the welding process, picosecond pulse laser follows continuous laser machining, and the welding process is completed. And reciprocating motion is conducted in the molten pool and the forging area according to a preset motion trail, so that different titanium alloy thick plates to be welded are welded. The technical effect that uneven distribution of the structure performance of the welding joint is avoided is achieved.

The application discloses a kind of full-automatic high-throughput space-time resolution fluorescence spectrum imaging system and method, it is related to fluorescence signal spectrum field, including: workbench, sample stage, objective, for preloading sample stage with sample and placing it on workbench on mechanical arm sample inlet module, for laser beam to the output module of picosecond pulse laser of objective, for simultaneously collecting the spectral data and dynamic data of fluorescence signal generated after sample is focused by laser beam fluorescence signal detection module and control module;Sample stage and objective are sequentially spaced apart on workbench along the vertical direction from top to bottom;Mechanical arm sample inlet module, picosecond pulse laser output module and fluorescence signal detection module are respectively connected with control module communication.This application can realize the simultaneous acquisition of spectral data and dynamic data of fluorescence signal automatically.

The invention discloses an integrated multi-beam device and method for aircraft part laser preheating, polishing and strengthening, and the device comprises a computer control system, a laser preheating device, a picosecond pulse laser device, an ultra-strong pulse laser device and a workbench, wherein the computer control system is used for controlling the movement of the laser preheating device, the ultra-strong pulse laser device, the picosecond pulse device and the workbench; the laser preheating device is used for focusing large-light-spot continuous laser beams on the surface of the aircraft part loaded on the surface of the workbench, and preheating of the surface of the aircraft part is achieved. The picosecond pulse device is used for forming small light spots which are focused on the preheated surface of the aircraft part to polish the surface of the aircraft part; the ultra-strong pulse laser device is used for forming high-energy small light spots which are focused on the polished surface of the aircraft part, and laser shock peening of the surface of the aircraft part is achieved. The machining efficiency and precision of aircraft parts can be effectively improved, and the manufacturing cost is reduced.

The invention discloses a laser drilling device for transparent materials, which comprises a first pulse laser, a second pulse laser, a first converter, a second converter, a first collimating mirror, a second collimating mirror, a beam combiner and a focusing objective lens, the first pulse laser is used for emitting first pulse laser, the first pulse laser is microsecond pulse laser or millisecond pulse laser or nanosecond pulse laser, the second pulse laser is used for emitting second pulse laser, and the second pulse laser is picosecond pulse laser or femtosecond pulse laser; the first converter is used for converting incident first pulse laser into a first Bessel pulse light beam; the second converter is used for converting the incident second pulse laser into a second Bessel pulse light beam; the emission time point of the first pulse laser is first preset time earlier than the emission time point of the second pulse laser. Hole making can be completed through laser one-time machining, an etching procedure is not needed, and the hole making efficiency can be greatly improved.

The present application relates to a wide-spectrum continuous picosecond pulse laser source and a laser generation method, comprising a controller and a seed laser diode, a plurality of amplification stages and a photonic crystal fiber connected in sequence, the controller being connected with the seed laser diode and the plurality of amplification stages; wherein the controller stores a plurality of editable repetition frequency parameters of the seed laser diode, amplification parameters of the amplification stages corresponding to each repetition frequency, and a switching strategy of different repetition frequencies, for selecting the repetition frequency of the seed laser diode as needed and outputting a repeatable continuous spectrum. The present application can generate picosecond light pulses in an ultra-wide continuous spectrum range of 400 nm to 2100 nm, the output spectrum has the spatial characteristics and high brightness of laser, and at the same time provides the bandwidth characteristics of incandescent lamps or fluorescent lamps. Through the setting of the present application, a repeatable output spectrum can be generated at all repetition frequencies, there is zero loss in output power, and no light pulse is lost during output.

The application discloses a wide-band micro-region semiconductor photocurrent imaging system and method, and belongs to the technical field of semiconductor testing. The system comprises a temperature adjusting module, a picosecond pulse laser output module, an optical chopper, a microscopic imaging module, an electric piezoelectric displacement table and a lock-in amplifier. The temperature adjusting module is used for adjusting the temperature of a semiconductor device to be tested to 4K to 296K. The picosecond pulse laser output module is used for outputting a pulse laser beam in a wave band of 430nm to 2000nm. The optical chopper is used for modulating the laser beam into an optical pulse signal with a fixed modulation frequency. The lock-in amplifier is used for applying a bias voltage to the semiconductor device to be tested and collecting a photocurrent signal under the fixed modulation frequency. The electric piezoelectric displacement table is used for moving the semiconductor device to be tested point by point under a low-temperature environment. The microscopic imaging module is used for synchronously acquiring a surface topography image and constructing a photocurrent spatial distribution map. The application solves the technical problem that the current technology cannot simultaneously realize multi-wavelength excitation, weak signal extraction and micro-region spatial resolution imaging under an extremely low-temperature environment.

The invention discloses a picosecond optical fiber optical parametric oscillator based on acousto-optic wavelength tuning, which comprises an embedded integrated control platform, and the embedded integrated control platform controls a mode-locked laser seed source, a narrow-spectrum high-power tunable pumping source and an optical fiber optical parametric resonant cavity in a coordinated manner; the mode-locked laser seed source adopts a mode-locked laser oscillator as a seed source, a tunable spectrum filter and a laser amplifier are arranged behind the mode-locked laser seed source, and the tunable spectrum filter can also be arranged in a resonant cavity of the mode-locked laser oscillator. And a laser amplifier is arranged behind the mode-locked laser oscillator to obtain narrow-spectrum high-power tunable pulse laser. On the basis of the laser saturation gain amplification process of bi-pass filtering, narrow-spectrum, high-power and picosecond pulse laser output with the adjustable center wavelength of 1035-1065 nm is achieved, and on the basis of the optical fiber optical parametric oscillation process, high-power, narrow-spectrum and picosecond pulse laser output with the rapidly-adjusted center wavelength of 785-985 nm is achieved.

This invention relates to an isotropic three-dimensional super-resolution imaging method using a single objective lens, comprising the following steps: outputting a linearly polarized excitation beam through a picosecond pulsed laser and an outputting a linearly polarized loss beam through a nanosecond pulsed laser; adjusting the polarization direction and power of the excitation and loss beams using a half-wave plate and a polarizing beam splitter; incident the loss beam onto a spatial light modulator; modulating the light field by loading a preset phase diagram to generate three focal points with different topological charges, axial positions, and energy distributions; and modulating the polarization state of the focal points using a high-order vortex phase delay plate to separate the loss beams with different polarization components. This invention achieves an imaging resolution of less than 100 nm in both the lateral and axial directions, with similar lateral and axial resolution performance. In three-dimensional super-resolution imaging, it can accurately reflect the true three-dimensional structure of an object. The imaging resolution is directly proportional to the intensity of the loss beam; the stronger the loss beam intensity, the higher the three-dimensional imaging resolution.

Disclosed is a facility (6) for stripping a moving metal product (3), comprising: - a stripping assembly (8) having at least one picosecond pulse laser device (10), each configured to emit picosecond laser pulses onto the surface of the moving metal product (3) in order to strip it, - a control unit (12) suitable for acquiring information relating to the moving metal product (3) and configured to: - determine operating parameters to be applied to the stripping assembly (8) in order to achieve stripping of the oxide layer on the surface of the metal product (3) by emission, by each laser device (10), of picosecond laser pulses onto the metal product (3) surface, - apply these operating parameters to the stripping assembly (8) in order to strip the surface of the metal product (3).

The application relates to the technical field of nanomaterial preparation, in particular to a method for preparing Cu@Ag particles by laser, which comprises the following steps: S1, preparing a solution: dissolving a copper precursor in a solvent to obtain a copper precursor solution, and dissolving a silver precursor in a solvent to obtain a silver precursor solution; S2, irradiating the copper precursor solution by using a femtosecond pulse laser to generate nano-copper particle cores through reduction; S3, adding the silver precursor solution into the liquid phase environment containing the nano-copper particle cores, adjusting the wavelength parameter of the picosecond pulse laser to the surface of the nano-copper particle cores to realize laser energy focusing, irradiating the solution by using the picosecond pulse laser, allowing silver ions to be reduced and deposited on the surface of the nano-copper particle cores to form a silver shell, and thus obtaining Cu@Ag particles, so that the problems that the existing chemical reduction method is not environmentally friendly and it is difficult to accurately control the generation sequence of the core and the shell are solved.

The application provides a high-speed picosecond pulse laser driver circuit based on a radio frequency triode, which comprises a signal generator, a high-speed level converter, a radio frequency triode Q2 and a DFB laser, the signal generator generates a narrow pulse signal for driving the laser, the narrow pulse signal is converted into an ECL level by the high-speed level converter, the radio frequency triode Q2 is driven to drive the DFB laser to emit light.The application has the advantages that: compared with a high-speed current source driving chip, the high-speed level converter is more universal, so it has more cost advantages; in addition, the high-speed current source driving chip needs a DAC to additionally provide an output adjusting driving current, and the high-speed level converter does not need it, so it has more cost advantages.

The utility model discloses a picosecond optical fiber optical parametric oscillator based on acousto-optic wavelength tuning, which comprises an embedded integrated control platform, and the embedded integrated control platform controls a mode-locked laser seed source, a narrow-spectrum high-power tunable pumping source and an optical fiber optical parametric resonant cavity in a coordinated manner. The mode-locked laser seed source adopts a mode-locked laser oscillator as a seed source, a tunable spectrum filter and a laser amplifier are arranged behind the mode-locked laser seed source, and the tunable spectrum filter can also be arranged in a resonant cavity of the mode-locked laser oscillator. And a laser amplifier is arranged behind the mode-locked laser oscillator to obtain narrow-spectrum high-power tunable pulse laser. According to the utility model, based on a laser saturation gain amplification process of bi-pass filtering, narrow-spectrum, high-power and picosecond pulse laser output with an adjustable central wavelength of 1035-1065 nm is realized, and based on an optical fiber optical parametric oscillation process, high-power, narrow-spectrum and picosecond pulse laser output with a rapidly adjustable central wavelength of 785-985 nm is realized.

The invention belongs to the technical field of laser, and particularly discloses a picosecond pulse wavelength tunable near-infrared narrow linewidth laser, which is used for providing picosecond pulse laser. The frequency doubling module is used for converting the picosecond pulse laser into pump light through the nonlinear effect of a frequency doubling crystal; the parametric oscillator is used for matching the phase period of the PPLN crystal through temperature control to output signal light, and the length of the resonant cavity is adjusted by combining piezoelectric ceramics, so that the output wavelength range of the signal light is adjusted; and the adjustable optical filter is used for receiving the signal light, and outputting the narrow-spectrum laser corresponding to the signal light by controlling the cavity length of the Fabry-Perot cavity when the intensity of the spectrum transmitted by the cavity length coincides with the transmission spectrum of the Ethernet etalon. According to the invention, tunable wavelength of 800nm-1030nm and narrow-pulse narrow-spectrum laser output are realized.

The invention discloses an SOI (Silicon On Insulator) silicon film transfer method based on maskless ultrashort pulse laser etching, which comprises the following steps of: ablating and processing micron-sized hole arrays and slits at positions which are not effectively occupied by an SOI surface silicon film and a device by using ultrashort pulse laser, and immersing a sample into a hydrofluoric acid solution to corrode a buried layer; when SiO2 between two adjacent round holes in the horizontal direction and the vertical direction is observed to be completely corroded, residues are formed in the area between the round hole in the outermost layer and the etching channel, the residual SiO2 in the buried layer can be used as a support, and the Si thin film can be supported under the condition that the transfer printing success rate is not reduced. For transfer printing of the Si thin film on the insulator with a large area, holes and channels are introduced through an ultra-short (picosecond) pulse laser, and hole distribution is designed, so that the etching speed of the whole etching area is the same as much as possible, over-etching can be avoided as much as possible, the integrity of the Si thin film is protected, and the success rate of subsequent transfer printing is improved.

The invention relates to the technical field of nano material preparation, in particular to a method for preparing Cu-coated Ag particles by laser, which comprises the following steps: S1, preparing a solution: dissolving a copper precursor in a solvent to obtain a copper precursor solution, and dissolving a silver precursor in the solvent to obtain a silver precursor solution; s2, the copper precursor solution is irradiated through femtosecond pulse laser, and nano-copper particle cores are generated through reduction; and S3, a silver precursor solution is added into the liquid phase environment containing the nano-copper particle cores, the wavelength parameter of picosecond pulse laser is adjusted till laser energy is focused on the surfaces of the nano-copper particle cores, the solution is irradiated through the picosecond pulse laser, silver ions are reduced and deposited on the surfaces of the nano-copper particle cores, silver shells are formed, and therefore the Cu-coated Ag particles are obtained. The problems that an existing chemical reduction method is not environmentally friendly, and the core and shell generation sequence is difficult to accurately control are solved.

The invention belongs to the technical field of optical elements, and particularly relates to an ultraviolet band antireflection film, a preparation method thereof and an ultraviolet antireflection film element. The film layer structure of the ultraviolet band antireflection film provided by the invention comprises a first hafnium oxide layer, a first silicon oxide layer, a second hafnium oxide layer, a second silicon oxide layer, a third hafnium oxide layer and a third silicon oxide layer which are sequentially stacked, wherein the first hafnium oxide layer is in contact with the surface of a substrate; and the total thickness of the first hafnium oxide layer, the second hafnium oxide layer and the third hafnium oxide layer accounts for 5-10% of the total thickness of the film layer structure. The ultraviolet band antireflection film provided by the invention has the characteristics of ultraviolet resistance and high power, is high in wavelength drift resistance, and can meet the requirements of high transmittance and no damage trace on the appearance under the condition of continuous long-time irradiation of a picosecond pulse laser; meanwhile, the film layer is weak and small in absorption, the yield is high, and industrial large-scale stable preparation can be met.

A picosecond pulse nonlinear compression device based on a multi-pass cell achieves the advantages of high energy, compactness, and low cost, realizing femtosecond-level pulsed lasers at kilohertz repetition rates. A picosecond pulsed fiber laser generates stable mode-locked picosecond pulses with repetition rates of tens of megahertz. These pulses are injected into a solid-state regenerative amplifier via a fiber coupler, selectively amplifying the output signal to generate millijoule-level picosecond pulses with kilohertz repetition rates. The pulses then enter a mode matching module, which matches the mode of the incident laser with the eigenmode of the MPC cavity. Afterward, the pulses are injected into a spectral broadening module, which is filled with a nonlinear medium liquid to broaden the incident laser spectrum. Finally, the pulses are injected through convex mirrors into a chirp compensation module, which includes multiple pairs of parallel chirped mirrors to compensate for dispersion in the broadened pulsed laser spectrum.

The present application relates to a streak tube laser radar wide beam high speed rate laser ranging method and ranging system; solve the problem that the existing STIL system needs to ensure high precision, the imaging frequency is high, the time is long, the imaging speed is low, the amount of data to be processed is large, which limits the application of STIL and the inaccurate reconstruction result caused by beam jitter; the method converts the laser emitted by the picosecond pulse laser into a wide beam to scan the target object for the first time, then reconstructs to obtain the echo distance, then adjusts the scanning area and the current scanning area and the last scanning area exist partially overlap, again collect, reconstruct to obtain the echo distance, through the echo distance error of the overlap area measured by the front and back two times, calculate and record the echo distance after eliminating the beam drift, repeat several times, until the whole distance information of the target object surface is obtained; the present application also proposes a system based on the above method.