40 results about "Nanosecond laser pulse" patented technology

The invention discloses a method and device for preparing a microchannel in a glass material. The method comprises the following steps: (1) the glass material to be treated and inscribed is placed in an ultrasonic environment to ensure that the lower surface of the glass is soaked in clean water and the upper surface of the glass is exposed in air; (2) the laser emitted by a nanosecond laser is focused by a focus lens, the focused nanosecond laser pulse is emitted to the upper surface of the glass material to be treated and inscribed vertically, the focus of the nanosecond laser pulse is on the lower surface of the glass material to be treated; and (3) a laser beam is emitted by the nanosecond laser from bottom to top according to a preset scanning path to ensure that a three-dimensional microchannel is inscribed in the glass. The device in the invention contains a three-dimensional platform, an ultrasonic cleaner, a support and a focus mirror. When the device in the invention works, the ultrasonic cleaner is fixed on the three-dimensional platform; and the glass material to be treated is placed in the cavity of the ultrasonic cleaner through the support, and the focus mirror is fixed on the vertical shaft of the three-dimensional platform. By adopting the method in the invention, the defects of the prior art such as low production efficiency, high cost and limited depth-to-width ratio can be overcome.

The invention provides a time domain phase recovery all-fiber laser pulse weak phase measuring device and method. The device comprises a fiber splitter arranged long the laser pulse input direction. The fiber splitter divides laser pulses to be measured into a high beam of light and a weak beam of light. An adjustable optical fiber delayer, a high speed optical fiber phase modulator, a dispersion optical fiber and an oscilloscope are successively arranged long the direction of the high light beam. A high speed PIN photoelectric tube, an arbitrary waveform generator and an electric signal amplifier are successively arranged long the direction of the weak light beam. An output end of the electric signal amplifier is connected with a modulation input end of the high speed optical fiber phase modulator. According to the invention, the all-fiber structure is utilized to carry out phase modulation and dispersion transmission on the laser pulses, the structure is compact, simple and flexible, and the measuring method is different from other laser pulse phase measuring modes; in addition, by adopting the measuring device and method, the weak phase picoseconds or nanosecond laser pulses can be measured, and the measuring device and method are applicable to the conditions of a high repetition frequency and a low repetition frequency.

The invention provides a laser-driven macroscopic liquid flow device and method based on optical fiber which is used for solving the problem that macroscopic liquid flow cannot be produced through simple combination of a photoacoustic effect and a sound wave driving fluid effect. According to the laser-driven macroscopic liquid flow device and method based on the optical fiber, nanometer gold particles are injected into one end face of the optical fiber by adopting an injection technology, and fixed and immersed in a driven solution, meanwhile, a nanosecond laser pulse is coupled into the optical fiber from the other end face of the optical fiber, and the laser pulse interacts with the nanometer gold particles injected into the optical fiber; the nanometer gold particles produce ultrasoundunder the effect of laser due to the photoacoustic effect, and meanwhile, a liquid is driven to flow due to the sound wave driving fluid effect; a fixed liquid-liquid interface and a liquid flow channel are needed, special requirements for the flowing liquid and the environment do not exist, the laser-driven macroscopic liquid flow device and method based on optical fiber is suitable for any liquids, tenability of the flow speed and direction of the driven liquid can be achieved, flowing of the driven liquid is monitored on line in real time by adopting a CCD, the control accuracy is improvedgreatly, and operation is convenient and easy.

The invention discloses a picosecond laser device and a method for inhibiting a first pulse in the picosecond laser device. The method comprises the steps that a switch of an amplifier is turned on through a switch driving source during start to oscillate noise radiation of the amplifier in an amplification cavity of the amplifier for multiple times so as to form nanosecond laser pulses, and stored energy of a gain transistor of the amplifier is consumed in the forming and growing process of the laser pulses. When the stored energy of the gain transistor is reduced to a preset value, the switch of an amplifier is turned off through the switch driving source to make the amplification cavity of the amplifier output nanosecond-order laser pulses be in a high-loss state. A picosecond laser signal is obtained from an oscillator through a pulse menu device and is injected into the amplification cavity of the amplifier, and the gain transistor conducts multi-time amplification on the picosecond laser signal and outputs the signal. In the mode, by the adoption of the picosecond laser device and the method, first pulse energy of picosecond laser signals can be inhibited, the service life of optical components and devices can be prolonged, and a laser processing effect can be improved.

The invention relates to a crystal laser pretreatment and point-to-point damage testing device and testing method, which belong to the fields of laser pretreatment and damage testing. The testing method comprises laser pretreatment of a subnanosecond laser pulse on a crystal of a sample to be tested, and on-line damage threshold test of a nanosecond laser pulse on pretreatment points of the crystal of the sample to be tested. Through a half wavelength plate, a polarizing film and an aperture diaphragm in the testing device, collineation of the subnanosecond laser pulse and the nanosecond laser pulse is realized, so that the on-line point-to-point damage threshold test of the crystal is accurately realized. The invention provides a simple and effective testing method and testing device, so that the problem that the pretreatment points are hard to find accurately caused by the fact that the crystal is pretreated and is then subjected to the damage threshold test is effectively solved, the on-line damage threshold test of the crystal after pretreatment can be realized, and the device has the characteristics of simple structure, easiness in operation, and accuracy in finding the points.

The invention discloses a measuring device and method for geometric size distribution of needle damage loci formed in an KDP crystal subjected to nanosecond laser pulses, and belongs to a measuring device and method for KDP crystal damage in the technical field of KDP crystals. A damage threshold is generally used for evaluating damage-resistant properties of optical elements including crystals, but the damage threshold itself has the probability and is prone to be affected by testing conditions, testing methods, testing parameters and data processing. The geometric size distribution of the needle damage loci in the crystal serves as an evaluation criterion for evaluating the damage-resistant property of the crystal, and the corresponding testing method and device are provided. The evaluation criterion and the testing method thereof can overcome the defects of the damage threshold and a testing method thereof.

The present invention relates to a method for detecting steel sample components by using a multi-pulse laser induced plasma spectral analysis device, and in particular, to a method for detecting steel sample components by using a multi-pulse laser induced plasma spectral analysis device that includes picosecond and nanosecond laser pulse widths. A laser induced light source is a laser light source that includes nanosecond and picosecond ultrashort pulses, and one pulse laser device can be used to generate two pulse lasers, namely, a nanosecond and a picosecond laser; the two pulse lasers pass through a same output and focusing light path, so as to ensure that the two pulse lasers are focused on a same position of a sample to be detected; a surface of the sample is irradiated by using a first beam of nanosecond laser pulse to generate plasmas; subsequently, the plasmas are irradiated by using a second beam of picosecond laser pulse to enhance spectral line emission.

The invention relates to the technical field of ultrafast laser, in particular to a method for full optical control and precise synchronization of femtosecond, picosecond, nanosecond laser pulses with various wavelengths. The method adopts an injection-locked laser synchronization structure, uses the output light of a femtosecond pulse laser as control light, injects the output light into a fiber annular laser, utilizes the nonlinear effect of fiber to have crossed phase modulation or gain modulation control and realizes laser synchronization. The method has the advantages that the length of the fiber injected by femtosecond pulse can be arbitrarily set to realize long-distance laser pulse synchronization; according to elements doped to the gain fiber of the selected annular laser, the method can realize the synchronization of the laser pulse with various wavelengths; and through a translation platform for controlling the length of a cavity of the optical annular laser, the method can realize the output of mode-locked pulse with adjustable width from picosecond to nanosecond, keep synchronization between the output pulse and the injected femtosecond pulse, control a plurality of the fiber annular lasers and realize synchronization between a beam of femtosecond laser and a plurality of beams of laser with different wavelengths and pulse widths.

Systems and methods for processing an electrically conductive link in an integrated circuit use a series of laser pulses having different pulse widths to remove different portions of a target structure without substantially damaging a material underlying the electrically conductive link. In one embodiment, an ultrafast laser pulse or bundle of ultrafast laser pulses removes an overlying passivation layer in a target area and a first portion of link material. Then, a nanosecond laser pulse removes a second portion of the link material to sever an electrical connection between two nodes in the integrated circuit. The nanosecond laser pulse is configured to reduce or eliminate damage to the underlying material.

The invention discloses a (D)KDP crystal body damage performance high-precision measurement device and measurement method, relating to the technical field of (D)KDP crystal body damage measurement. According to the method, crystal body damage point base data after action of high power nanosecond laser pulse is acquired through chromatography, problems like damage point repeated statistics, background light elimination and binarization are solved, center of mass of each scattering point is resolved by using an image moment algorithm, then body damage point three-dimensional distribution is acquired through a reconstruction algorithm, then three body damage representation parameters, including crystal body damage density ppd, body damage point geometric size distribution pps and crystal bodydamage point three-dimensional distribution can be acquired highly precisely. The method has the advantages of high measurement accuracy and more complete crystal body damage representation.

The invention relates to a nanosecond laser pulse regenerating amplifier which is characterized in that: the regenerating amplifier comprises a postfix pulse generating unit, a regenerating amplifier unit and an electric light isolator; postfix laser pulses generated by the postfix pulse generating unit are input into the regenerating amplifier unit by optical fibers; the laser pulses are output by the electric light isolator from the regenerating amplifier unit. The nanosecond laser pulse regenerating amplifier reduces the wave distortion of a seed laser pulse after being amplified and can realize pulse amplification of high stability and low time domain wave distortion by inputting postfix laser pulses into the regenerating amplifier unit.

The invention relates to a rectangular uniform laser pulse impact strengthening and forming system and an application method thereof. The system comprises a laser generation module, an external optical shaping module and a sample piece module, wherein the laser generation module is configured as a nanosecond laser for outputting nanosecond laser pulses; the external optical shaping module comprises a shaping curved mirror group or a shaping curved combined mirror, and is configured to shape the nanosecond laser pulses to form rectangular uniform nanosecond laser pulses; and the sample piece module comprises a plurality of sample pieces to be subjected to a laser pulse shot blasting technology and materials for forming the sample pieces. The application method is to apply the laser pulse shot blasting technology to the sample pieces and the materials for forming the sample pieces by adopting the system. The system and the method solve the problems generated by adopting circular laser spots in the prior art and the problems that the conventional domestic square pulse laser outputs low laser pulse energy and is not suitable for the laser pulse shot blasting technology.

The invention relates to an acousto-optic Q-switched sub-nanosecond infrared solid laser, which comprises a laser source and a laser resonant cavity, wherein the laser resonant cavity comprises a resonance light path and an acousto-optic Q switch Q1; and laser output by the laser source passes through the resonance light path and then generates resonance light to be output to the acousto-optic Q switch, and the acousto-optic Q switch generates laser pulses and then outputs the laser pulses. The laser resonant cavity is simple and small in structure, sub-nanosecond laser pulses less than 6ns can be obtained through the short optical resonant cavity and the small light spot size under the condition that only acousto-optic Q-switching is conducted, and excellent seed laser is provided for a sub-nanosecond infrared/green laser with higher power.

Provided is a polyacid-hydrotalcite third-order nonlinear optical film and a preparation method thereof, which belongs to the technical field of functional material. The material of the film is obtained by alternate assembly of zn-al hydrotalcite Zn2A1-LDH and Keplerate-type polyacid [Mo132] through a layer-by-layer self-assembly method. The preparation method comprises the following steps: soaking a pre-processed substrate in stripped Zn2A1-LDH suspension liquid for several minutes; taking the pre-processed substrate out, flushing the pre-processed substrate with deionized water and drying the pre-processed substrate with N2; putting the pre-processed substrate into a [Mo132] water solution for immersion about minutes; taking the substrate out, flushing the substrate with deionized water and drying the substrate with N2; and obtaining the polyacid-hydrotalcite composite film by repeating the above steps for n times. The preparation method of the polyacid-hydrotalcite third-order nonlinear optical film provides a means for practical application. The polyacid-hydrotalcite third-order nonlinear optical film and the preparation method thereof have the following beneficial effects: the preparation method is simple, low in cost, high in stability and adjustable in thickness; and under nanosecond laser impulses, saturated absorption and self-defocusing property can be controllable.

The invention relates to the technical field of high-energy density physics, in particular to a radiation impact target and a method for generating radiation impact waves with the speed of 100 km/s or above in xenon. The radiation impact target comprises an impact wave tube, a shielding cover, an annular metal sheet, an ablation layer and a gas storage chamber, one end of the shock wave tube is communicated with the gas storage chamber, the other end of the shock wave tube is communicated with one end of the shielding case, and the other end of the shielding case is open; the annular metal sheet is arranged at the end part of one end, connected with the shielding cover, of the shock wave tube, and the ablation layer is arranged on the annular metal sheet. The ablation layer acts with the nanosecond laser, and radiation shock waves are generated in the shock wave tube filled with xenon. The X-ray fluoroscopic photography technology can be used for carrying out fluoroscopic photography on the radiation shock wave propagation process. The propagation velocity of the radiation shock wave can be obtained through the relative position of the radiation shock wave wavefront and the positioning grid and the relative delay of the X-ray source and the nanosecond laser pulse.

The invention relates to the technical field of laser, in particular to a system and a method for suppressing waveform distortion of a hundred nanosecond laser pulse, which are characterized in that a trigger signal is set as a square wave to amplify laser, the pulse waveform of the amplified output laser is observed, and according to the sharpening degree of the output pulse laser, the waveform distortion of the hundred nanosecond laser pulse is suppressed. Pre-compensating an output waveform by using an arbitrary waveform generator through a tracing point; the acousto-optic modulator is connected with the light source at the same time, pulse laser of a corresponding waveform is obtained after a tracing point trigger signal of the arbitrary waveform generator is received, and finally near-flat-topped pulse output after laser amplification is achieved. According to the invention, the pulse waveform leading edge sharpening problem in the amplification process of the pulse laser is solved, the peak power of the pulse laser is reduced, the optical nonlinear effect of stimulated Brillouin scattering is inhibited, and the narrowing of the laser pulse width is limited.