24 results about "Picosecond pulse" patented technology

The invention discloses a method and a device for outputting large-energy picosecond pulse laser with external synchronization picosecond-level jitter. The device comprises a high-precision time sequence controller, a semiconductor picosecond pulse seed source, an optical isolator and a high-gain and high-stability regenerative amplifier. The semiconductor picosecond pulse seed source outputs low-energy picosecond-level (10-12J, pJ) and low-jitter picosecond-level (10-12s, ps) picosecond pulse seeds under the trigger of a time sequence controller of a high-precision external clock, the picosecond pulse seeds enter the high-gain high-stability regenerative amplifier through the optical isolator, and the high-gain high-stability regenerative amplifier outputs high-energy picosecond-level (10-12s, ps) picosecond pulse seeds under the control and adjustment of the high-precision time sequence controller. The picosecond pulse seed is locked to be regenerated and amplified in the regenerative amplifier, and the energy of the picosecond pulse seed with low energy and low jitter at a picofocus (pJ) level is amplified to uJ-mJ (10 <-6 > J-10 <-3 > J), so that low jitter and large energy output of laser pulses and trigger signals are realized, and application development of high-precision laser ranging, laser communication, time-frequency transmission and the like is effectively promoted.

The invention discloses a high-power picosecond pulse train laser with programmable sub-pulse energy and a method, and relates to the related technical field of lasers, the high-power picosecond pulse train laser comprises a mode-locked fiber laser, an acousto-optic modulator and a solid amplification chain which are sequentially arranged along an optical transmission path; the mode-locked fiber laser generates a mode-locked picosecond pulse sequence; the acousto-optic modulator performs pulse selection and pulse string grouping on the mode-locked picosecond pulse sequence, and performs pre-programming shaping on sub-pulse energy in a pulse string according to set intensity distribution to generate a pre-shaped pulse string; the solid amplification chain comprises at least one stage of solid amplifier, and the solid amplifier comprises a dichroscope, a laser gain crystal, a coupling optical assembly and an LD pumping source; and the dichroscope is used for focusing the pre-shaped pulse string amplified at the previous stage and the LD pump light transmitted by the coupling optical assembly into the laser gain crystal. Independent programmable regulation and control of the energy of each sub-pulse in the pulse string are realized, and the energy distribution of each sub-pulse in the pulse string can be flexibly adjusted.

The invention discloses a generating device capable of generating an ultra-flat broadband micro comb. The generating device comprises a pump pulse generating module, a micro comb generating module and a micro comb generating module, the pumping pulse compression module is connected with the pumping pulse generation module; the high-Q-value microcavity module is connected with the pumping pulse compression module; and the micro comb detection and feedback module is respectively connected with the high-Q-value micro-cavity module and the pump pulse generation module, and is used for monitoring the output spectrum and power change of the high-Q-value micro-cavity module and adjusting the output wavelength of the picosecond pulse light according to the output spectrum and power change so as to stabilize the ultra-flat broadband micro comb. By arranging the high-Q-value micro-cavity, the spectral bandwidth of the micro-comb can be effectively expanded, and the ultra-flat broadband micro-comb is output; meanwhile, the defects that the hyperbolic secant single soliton micro-comb is poor in flatness and narrow in bandwidth are overcome, and the micro-comb has obvious advantages in the application field with high requirements for the flatness and the spectral bandwidth at the same time.

The utility model discloses an ultra-high-speed picosecond pulse rising edge generator, which relates to the technical field of power electronics and comprises an oscillating circuit, a multivibrator circuit and a trigger, and the oscillating circuit is electrically connected with the trigger through the multivibrator circuit. The oscillating circuit comprises a first integrated circuit, a first resistor and a first capacitor, the model of the first integrated circuit is NE555, the sixth end of the first integrated circuit is electrically connected with the third end of the first integrated circuit through the first resistor, and the sixth end of the first integrated circuit is grounded through the first capacitor; a third end of the first integrated circuit is electrically connected with an input end of the multivibrator circuit, in the ultra-high-speed picosecond pulse rising edge generator, a high-frequency oscillation circuit is output through the oscillation circuit, frequency division oscillation output is carried out through the multivibrator circuit, and therefore picosecond-level oscillation output is achieved, and finally a pulse signal is output through the trigger. The whole circuit is simple in structure, high in practicability and high in cost performance.

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 an ion channel protein near-atomic scale confinement dissolution electrochemical machining method based on a bionic confinement interface. The method is characterized in that a bionic phospholipid bilayer mask is spread on a workpiece anode to shield a non-processing area, ion channel protein is embedded into the bionic phospholipid bilayer mask to serve as an electrolyte channel, and when the bionic phospholipid bilayer mask is powered on, the anode dissolution reaction is strictly limited in the ion channel protein channel. Millivolt-level picosecond-nanosecond pulse voltage or current is adopted on the time scale so that anode metal atoms can be removed one by one, electrolytic products are discharged in the modes of electrolyte adjustment, microcosmic acting force, micro vibration and the like so as to ensure sustainable generation of electrochemical reaction, and therefore near-atomic-scale electrolytic machining is achieved. The electrochemical machining technology and the biological field are fused in an interdisciplinary mode, the near-atomic-scale electrochemical dissolution reaction space is constructed, the capacity of electrochemical machining for removing materials in an ion form is approached, and near-atomic-scale electrochemical machining is achieved.

Wavelength-tunable source of pulsed laser radiation for VIS-NIR spectroscopy which consists of a pump source (1) forming bursts of picosecond pulses of high pulse repetition rate, and a synchronously pumped optical parametric oscillator (2). The pump source (1) comprises a solid-state regenerative amplifier (31) having one or two electro-optical switches (32,33) inside its resonator (44). The switches create partial transmission of the resonator for a time interval longer than a resonator roundtrip time, and eject a part of energy of a pulse circulating inside. Bursts of 5-10 ns duration are formed, which are filled with high peak power picosecond pulses. Pulse repetition rate of the order of GHz of pump pulses allows the construction of a compact optical parametric oscillator. The whole set of parameters ensures high energy efficiency, stability and an ability to provide output pulse bursts repeating at up to 10 kHz repetition rate.

The application provides a picosecond pulse source based on harmonic self-mode-locking semiconductor surface-emitting laser, comprising an optical pumping assembly and a V-cavity resonant cavity assembly, the optical pumping assembly comprises a semiconductor bar laser and a collimating and focusing lens optical coupling assembly, and the V-cavity resonant cavity assembly comprises a microcavity gain structure and an external cavity structure; wherein the pump laser emitted by the semiconductor bar laser is focused and coupled by the collimating and focusing lens optical coupling assembly to output a light spot, the light spot is absorbed and gain-processed by the microcavity gain structure, and then the resonant laser is output by the external cavity structure through feedback resonance; and when the resonant laser and the light spot are matched in the external cavity structure, the external cavity structure outputs the mode-locked pulse after adjustment through spatiotemporal dynamics calculation. The picosecond pulse source realizes harmonic mode-locked pulse output with a pulse width of hundreds of picoseconds and a repetition frequency of hundreds of MHz.

The application provides a semiconductor-pumped cesium vapor mode-locked laser and a method for generating ultra-short pulse laser. The laser comprises a semiconductor pumping source for outputting a pumping beam; a pumping light shaping system for receiving the pumping light and converging the pumping light to the middle part of a cesium vapor cell; the cesium vapor cell for performing gain on the shaped pumping light to generate gain laser; and a mode-locked resonant structure for outputting mode-locked laser after oscillation mode-locking of the gain laser. The pumping light emitted by the semiconductor pumping source is focused into the cesium vapor cell through the pumping light shaping system, and after gain on the cesium vapor as gain medium, the pumping light enters the mode-locked resonant structure to oscillate to form the cesium vapor mode-locked laser. The application has picosecond pulse width, and greatly improves the peak power of the current alkali metal laser.

The application discloses a high-power picosecond pulse train laser with programmable sub-pulse energy and a method, relates to the technical field of lasers, and comprises a mode-locked fiber laser, an acousto-optic modulator and a solid amplification chain arranged in sequence along an optical transmission path; the mode-locked fiber laser generates a mode-locked picosecond pulse sequence; the acousto-optic modulator performs pulse selection and pulse train grouping on the mode-locked picosecond pulse sequence, pre-programmed shaping is performed on the sub-pulse energy in the pulse train according to a set intensity distribution, and a pre-shaped pulse train is generated; the solid amplification chain comprises at least one solid amplifier, the solid amplifier comprises a dichroic mirror, a laser gain crystal, a coupling optical assembly and an LD pumping source; the dichroic mirror is used for focusing the pre-shaped pulse train amplified by the last stage and the LD pumping light transmitted through the coupling optical assembly into the laser gain crystal. Independent programmable control of the energy of each sub-pulse in the pulse train is realized, and the energy distribution of each sub-pulse in the pulse sequence can be flexibly adjusted.

The invention discloses a high-amplitude picosecond pulse source based on a metal oxide semiconductor field effect transistor and a step recovery diode. The high-amplitude picosecond pulse source is used for driving an ultrafast semiconductor laser. The circuit is composed of a power supply circuit, a pulse generation circuit based on an MOSFET, and a pulse shaping circuit based on an SRD and a short-circuit transmission line. The power supply circuit converts an external input constant voltage into different voltages suitable for each device, and also provides a bias current for the SRD in the shaping circuit, thereby guaranteeing the normal work of each part. The pulse generation circuit adopts an MOSFET driving chip to accelerate and amplify a trigger signal so as to drive a high-voltage-resistant and small-parasitic MOSFET and generate a high-amplitude and fast-leading-edge subnanosecond pulse. The pulse shaping circuit adopts a short-circuit transmission line structure composed of a parallel SRD and a Schottky diode, a preceding-stage pulse is sharpened, and a picosecond Gaussian pulse with the amplitude up to 10V is generated. The design serves as an electric pulse generator, has ultra-short pulse width and high amplitude, and can be applied to semiconductor lasers of various wave bands.

The application provides a GHz picosecond laser pulse generation device and method based on FPGA. The GHz picosecond laser pulse generation method comprises the following steps: generating four paths of clock signals with a phase interval of 90 degrees and a frequency of not less than 250 MHz in an FPGA by using a clock synthesizer, driving a half-period pulse generation unit by each clock to generate a pulse with a width less than a clock period, generating a picosecond-level pulse signal from the pulse, and generating a GHz pulse signal from the four paths of picosecond-level pulse signals by a pulse synthesis unit, which is used to drive a subsequent laser. The GHz picosecond laser pulse generation device and method based on FPGA comprise a clock synthesis unit, a half-period pulse width generation unit, a picosecond pulse generation unit and a pulse synthesis unit, and the GHz pulse has good consistency and high stability.

The application discloses a kind of tissue treatment systems based on dual-wavelength picosecond pulse synergism, comprising: laser light path component, light regulation module, beam combination and focusing device, multimodal sensor acquisition module and control unit, laser light path component includes laser source, frequency doubling crystal and beam splitter;Laser source, frequency doubling crystal and beam splitter are sequentially arranged, laser source emits laser to frequency doubling crystal, generates second harmonic, then the light beam is separated after passing through beam splitter, forms two laser beams, light beam is shot into light regulation module, light regulation module is shot into beam combination and focusing device after regulating laser beam, beam combination and focusing device are shot to target area, multimodal sensor acquisition module collects the signal feedback of target area, and control unit processes the signal collected.The application emits fundamental frequency light, is regulated by light regulation module, accurately controls pulse emission timing, according to the signal feedback of multimodal sensor acquisition module, real-time dynamic fine-tuning pulse timing and energy.

The invention provides a controllable high repetition frequency multiplication fiber laser and system, and relates to the technical field of lasers, the controllable high repetition frequency multiplication fiber laser comprises an adjustable repetition frequency mode-locked seed source, an adjustable repetition frequency multiplication module and a repetition frequency control module, the adjustable repetition frequency mode-locked seed source is connected with the adjustable repetition frequency multiplication module; the adjustable repetition frequency multiplication module is used for dividing the picosecond pulse light output by the adjustable repetition frequency mode-locked seed source into multiple paths and combining the multiple paths of picosecond pulse light again to generate repetition frequency doubled pulse light; the repetition frequency control module is respectively connected with the adjustable repetition frequency mode-locked seed source and the adjustable repetition frequency multiplication module, and is used for receiving multiple paths of picosecond pulse light output by the adjustable repetition frequency multiplication module and outputting a feedback control signal to the adjustable repetition frequency mode-locked seed source and the adjustable repetition frequency multiplication module; and the repetition frequency of the controllable high repetition frequency multiplication fiber laser and an external reference frequency signal are locked. According to the invention, high repetition frequency and high-precision adjustable mode-locked laser output can be 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 application discloses a kind of microvia processing methods based on picosecond-microsecond composite laser, steps include: S1: processing substrate is washed and dried;S2: setting laser processing path;S3: first pulsed laser is generated and shaped;S4: after interval predetermined time, second pulsed laser is generated and primarily shaped;S5: first pulsed laser and second pulsed laser are integrated by beam combiner, and cooperate in predetermined position, form microvia;Again, microvia is sequentially processed along laser processing path in processing substrate, microvia array processed in processing substrate can be formed.The microvia processing method is through the synergistic mechanism of " picosecond pulse induced channel " and " microsecond pulse selective removal ", using its no diffraction, long focal depth characteristics, can be processed in hard and brittle transparent material once microvia with depth-diameter ratio more than 300:1, and single-hole processing time can be shortened to 20 μs, suitable for high depth-diameter ratio microvia high-density, mass production.

A seed laser and fiber laser coherent combining system for implementing optical path control includes a picosecond pulse source, a high-speed photodetector, an intensity modulator, a single-frequency laser, and a phase modulation unit. The picosecond pulse source is connected to the high-speed photodetector, and the single-frequency laser is connected to the intensity modulator. The high-speed photodetector converts the detected pulsed optical signal into a pulsed electrical signal and loads it into the intensity modulator. The intensity modulator intensity-modulates the laser output from the single-frequency laser to convert it into a pulsed optical signal. The intensity modulator is connected to the phase modulation unit, which phase-modulates the pulsed optical signal output by the intensity modulator before outputting it. The seed laser is used in a fiber laser coherent combining system. When implementing optical path control, its significant advantage is that the center wavelength of the picosecond pulse source does not need to be consistent with the center wavelength of the single-frequency seed laser in the coherent combining system. That is, one picosecond pulse source can be used in multiple coherent combining systems with different center wavelengths.

The invention relates to a picosecond pulse generator and a picosecond pulse generation method based on amplitude and phase dual compensation, and belongs to the technical field of pulse generators. The picosecond pulse generator comprises a first-order amplitude compensation module which is used for generating multi-stage pulse signals with compensated amplitudes under the trigger of a trigger signal, and fixed phase differences exist among the pulse signals; the phase compensation module is used for receiving the multi-stage pulse signal, performing phase compensation and pulse compression on the multi-stage pulse signal through a multi-dimensional nonlinear transmission network, aligning the phase of each stage of pulse signal, and compressing the pulse width to a set picosecond-stage width; and the second-order amplitude compensation module is used for receiving the multi-stage pulse signals after phase compensation and pulse compression, carrying out phase alignment on the multi-stage pulse signals again, carrying out amplitude superposition on the aligned pulse signals, and outputting picosecond-stage pulse signals meeting the expected amplitude. According to the picosecond pulse generator, generation of high-amplitude picosecond pulses can be achieved at low cost.

A method and a system for arbitrary optical waveform generation from an optical input, the system comprising an optical shaper comprising unbalanced interferometers with at least one delay, the delay being selected of at least 0.1 ps, an optical sampling readout selected for measuring optical waveforms of at least 0.1 ps; and an electronic processing unit; wherein the optical input is a picosecond pulse; with a minimal pulse duration before the optical shaper equal to a minimal delay of the optical shaper; the optical shaper splitting and interfering optical pulses; the optical sampling readout collecting data at an output of the optical shaper; and the electronic processing unit comparing the collected data with a preset target and updating the optical shaper from results of the comparison until a maximal match between the output of the optical shaper and the preset target output, wherein the maximal match is determined iteratively using one of: machine-learning, optimization algorithms and iterative search algorithms.

The application provides a semiconductor-pumped alkali metal mode-locked laser and a method for generating an alkali metal mode-locked pulsed laser. The laser comprises a semiconductor pumping source for outputting a pumping beam; a pumping light shaping system for receiving the pumping light and converging the pumping light to a middle part of an alkali metal vapor cell; the alkali metal vapor cell for gaining the shaped pumping light to generate gain laser; and a mode-locked resonant structure for oscillating and mode-locking the gain laser to output the alkali metal mode-locked laser. The application has the characteristics of picosecond pulse width, high peak power, high efficiency, good beam quality, good amplification, reliable use and the like. The application has important application value and development prospect in scientific frontiers, detection and elimination of space debris, industrial precision machining, laser communication and medical cosmetology and the like.

The invention discloses a picosecond pulse source device with adjustable amplitude and a fast rising edge, and belongs to the technical field of electronic circuits. According to the pulse source device, the fast rising edge and narrow pulse width of a positive pulse signal are ensured, and meanwhile, amplitude and repetition frequency adjustment is carried out on the pulse signal generated by the Marx circuit; two triggering signal modes of internal triggering and external triggering are supported, and the internal triggering signal generating circuit can generate internal triggering signals with adjustable repetition frequency; the Marx circuit outputs a pulse signal after receiving the trigger signal, the Marx circuit is debugged, the output is reversely connected, a high-amplitude and fast-rising-edge positive pulse signal is generated, and the positive pulse signal with the adjustable amplitude is output through the amplitude adjusting module. The device disclosed by the invention is integrated in a cavity, so that the reliability and convenience of the pulse source are enhanced; the invention has the advantages of simple operation, small size and the like, is beneficial to modularization, has adjustable amplitude and faster rising edge, and can meet the requirements of amplitude and repetition frequency conditions in different application scenes.

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.

This invention relates to an ultrafast laser processing system and method for thin-film temperature sensors. A beam splitting module divides the beam output from a single femtosecond laser into two paths, which are then shaped into a femtosecond pulse train and a picosecond pulse by a femtosecond pulse generation module and a picosecond pulse generation module, respectively, achieving single-source dual-pulse-width beam output. A composite module adjusts the delay and synthesizes the two pulses, ensuring precise temporal coordination between the picosecond pulse and the subsequent femtosecond pulse train: the picosecond pulse, with its pulse width shorter than the thermal diffusion time, rapidly preheats the metal substrate; the femtosecond pulse train, with its ultrafast characteristics, precisely controls the temperature field of the preheated region. Through the shaped composite pulse train, the timescale of metal oxidation / nitriding reactions forming ceramic thin films can be precisely matched, enabling active control of the thermal diffusion and thermal equilibrium processes, thereby obtaining a ceramic thin-film sensitive unit layer with controllable local thickness, crystal form, and composition.

A device and method for detecting nanosecond laser damage processes based on pump-probe technology. The device comprises: a first digital delay signal generator, a second digital delay signal generator, a third digital delay signal generator, a detection laser that generates femtosecond or picosecond pulses, a pump laser that generates nanosecond high-energy pulses, a first shutter, a second shutter, a focusing lens, a highly reflective mirror, a detection signal receiving device, and a computer. This method uses the pulse signal output by the first digital delay signal generator as a reference to trigger subsequent digital delay signal generators, which output frequency-varying signals to delay the output pulses of the detection laser and the pump laser, respectively. Shutter control is then combined to extract precisely delayed pump and detection pulses. This method reduces hardware requirements, enabling longer delays while avoiding the site and component requirements associated with optical path delays, simplifying the device's complexity and operational difficulty.