9 results about "Picosecond laser pulse" patented technology

The invention discloses a pulse compression device based on a multistage multi-pass cavity, which comprises a pulse laser and a plurality of compression modules arranged along a light path of the pulse laser, the compression module comprises a pulse laser spot matching module, a multi-pass cavity module, a light beam collimating lens and a pulse dispersion compensation module which are arranged along a light path of the pulse laser; according to the pulse compression device based on the multi-stage multi-pass cavity, the pulse width is continuously compressed by using the two-stage or multi-stage multi-pass cavity, and the pulse from hundred femtoseconds to picoseconds can be compressed to be below 10fs; the device is suitable for femtosecond or picosecond laser pulse beams with different pulse peak powers, the intensity of a nonlinear effect is adjusted by changing the thickness and position of a solid nonlinear medium or changing the type and pressure of a gas medium, and pulses with different energy and widths are optimized and debugged differently; the compression ratio can be effectively improved, and the problem that the compression ratio of a single-stage multi-way cavity is limited is solved.

The invention relates to a method for operating a machining device (10a) comprising: at least one machining unit (12a), in particular a laser drilling unit, wherein, in at least one machining step, at least one through-opening (14a) is introduced into the substrate (16a) for an electrochemical cell by means of the machining unit (12a); and at least one open-loop and closed-loop control unit (20a) by means of which parameters of the machining unit (12a) are adjusted. According to the invention, the machining unit (12a) comprises at least one laser that can emit GHz bursts, wherein the individual laser pulses within the burst train are picosecond laser pulses, wherein, in said at least one machining step, the substrate (16a) for an electrochemical cell is machined by means of the GHz burst laser.

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).

This invention discloses a picosecond-level laser pulse generation device and method. It directly generates laser pulses with a dynamic extinction ratio of over 50dB by driving a laser with a radio frequency drive signal without DC bias. This allows for the simple reuse of conventional electro-optic intensity modulators to achieve a dynamic extinction ratio of over 100dB on the laser pulse. The high bandwidth characteristics of the electro-optic intensity modulator also allow the laser pulses directly generated by the laser to have a picosecond-level pulse width. Ultimately, this allows for the provision of laser pulses with a dynamic extinction ratio greater than 100dB and a picosecond-level pulse width through a solution with smaller device size, wider bandwidth, lower cost, and lower power consumption, while meeting the requirements of long-distance detection and high-resolution detection.

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 present invention provides a high-resolution and high-brightness backlight photography method based on picosecond laser driving, which relates to the technical field of backlight imaging, and aims to provide a high-resolution and high-brightness backlight photography method based on picosecond laser driving, which adopts a backlight photography device, and the method comprises placing the object to be photographed between the coding target and the deflection magnet; starting the picosecond laser pulse device and driving the metal luminescent target to emit X-rays through the picosecond laser pulse; photographing the object to be photographed backlight by X-rays, and the X-rays sequentially pass through the magnetic field space formed by the deflection magnet and the metal filter, and then act on the X-ray recording medium to form an original coded image; decoding the original coded image to obtain a restored image of the object to be photographed. The present invention has the advantages of low backlight imaging noise, high resolution and high brightness.

According to the high-power laser excitation MV / m giant electromagnetic pulse generation system provided by the invention, double picosecond laser pulses are adopted to interact with the gold target, the peak field intensity of the generated electromagnetic pulses reaches 3.08 MV / m, the controllability is high, the energy conversion efficiency is high, and the energy conversion efficiency is high. The device can be applied to various fields such as electromagnetic protection research, high-power microwave and directional energy weapon research and special electromagnetic environment simulation, and has relatively high environmental adaptability and wide application prospects; meanwhile, by adopting the double-picosecond laser pulse technology, the dependence on high-cost and high-energy-consumption laser equipment is remarkably reduced, so that the equipment purchase, operation and maintenance cost is effectively reduced, and the economical efficiency and the practical value of the technology are greatly improved.

The utility model relates to a picosecond seed source and a laser. The picosecond seed source comprises a pumping source, a short optical fiber, a bonding crystal and a refrigerator. The pumping source is used for outputting pumping light; the short optical fiber is used for transmitting pump light; the bonding crystal is used for receiving the pump light transmitted through the short optical fiber and outputting picosecond laser pulses with the pulse width of 250-900 picoseconds; the refrigerator comprises a water-cooling bottom plate and two thermoelectric refrigeration sheets, the two thermoelectric refrigeration sheets are arranged below the pumping source and the bonding crystal respectively and used for controlling the temperature of the pumping source and the bonding crystal respectively, the water-cooling bottom plate is arranged at the bottoms of the two thermoelectric refrigeration sheets, and a water-cooling channel is formed in the water-cooling bottom plate and used for cooling the thermoelectric refrigeration sheets through circulating cooling water.

The utility model provides a purple picosecond laser pulse time domain diagnosis system of a free electron laser device. The purple picosecond laser pulse time domain diagnosis system comprises an oscillator, an amplifier, a quadruplicated frequency module, an ultraviolet laser pulse time domain shaping module and a diagnosis system which are connected in sequence, the diagnosis system comprises a half-wave plate, a polarization beam splitter, a high reflective mirror, a lens, a signal indication light plug-in, a beam combiner, a BBO crystal, a dispersion prism, a band-pass filter and a photomultiplier, wherein the photomultiplier is connected with an oscilloscope. The function of the signal indication light plug-in is to output 360 nm signal light, and the signal light and light to be measured are collinearly output in a measurement light path so as to determine the position of the signal light generated in the actual measurement process; then a photomultiplier is installed at the position to detect signal light, then a signal indication light plug-in is moved out of a diagnosis light path, and time domain diagnosis of ultraviolet pulses is carried out; signal light is accurately and efficiently collected through the system, so that the problem that the installation position of the photoelectric detector cannot be determined due to too small signal light energy is solved.