8 results about "Pulse amplifiers" patented technology

The invention discloses a 2-micron short-period laser amplifier based on a thulium-doped positive dispersion fluorotellurite optical fiber, which can solve the problem that a negative dispersion thulium-doped optical fiber is not suitable for performing gain management nonlinear amplification on a 2-micron pulse, and can obtain a pulse width lt. 50 fs, and single pulse energy gt; the femtosecond laser output device has the advantages of being full-fibrillated and compact in structure. The 2-micron femtosecond seed source is femtosecond pulse laser of a 2-micron wave band generated based on nonlinear amplification loop mirror mode locking; the chirped pulse amplifier is used for obtaining sub-picosecond 1.9 mu m femtosecond laser output with the average power greater than or equal to 1W; the optical fiber GMN amplifier is used for obtaining a few-period femtosecond pulse; the high-power optical fiber pulse compressor is a hollow-core optical fiber and is used for carrying out accurate dispersion compensation and high-quality pulse compression.

This invention discloses a device for locating vibration events on power transmission lines. The device includes a pulsed laser module, an optical pulse amplifier, an optical fiber circulator, an optical fiber polarizer, a sensing optical fiber, a photodetector, a data acquisition card, and a data processing and control unit. It utilizes the optical fiber inherent in the power transmission line or a separately laid optical fiber as the sensing fiber. While the optical pulse propagates in the sensing fiber, it generates a Rayleigh scattering signal. Vibration events on the power transmission line disturb the polarization state and phase of the Rayleigh scattering signal, resulting in a significant difference in noise convergence in the obtained optical time-domain reflectometry curve before and after the location of the induced vibration on the sensing fiber. Therefore, the location is determined by identifying the convergence start point. This device is suitable for locating external vibration sources on quasi-static power transmission lines and has advantages such as long monitoring coverage distance, high positioning accuracy, and low false alarm rate.

The utility model discloses a kind of distributed optical fiber temperature detection systems, including the sensing optical fiber being laid along the length direction of low temperature pipeline;The end of the sensing optical fiber is provided with laser light source and optical signal pulse amplifier, the laser light emitted by the laser light source enters the sensing optical fiber after amplification by the optical signal pulse amplifier, and raman scattering occurs at each position of the sensing optical fiber;The end of the sensing optical fiber is also provided with data acquisition module, APD photoelectric conversion module and wave division multiplexer, laser scattering in the sensing optical fiber will form the echo signal of different wavelength stokes light and anti-stokes light, the echo signal of the sensing optical fiber is converted after passing through the wave division multiplexer and the APD photoelectric conversion module, enters the data acquisition module, and the data acquisition module obtains the light intensity signal of at least two beams of light, based on the principle that light intensity is different under different temperatures, the temperature condition of reflection point is obtained by analyzing light intensity change.

The utility model relates to four program femtosecond laser compressor, through the light of first time through the compressor output is injected into the compressor for many times, incident chirp pulse is along the compressor light path and is emitted four times, total transmission grating 8 times, finally through the output mirror output completes compression output, make the number of times of light beam through grating increase to 16 times, make the same grating aperture and grating spacing compressor dispersion quantity turn 4 times, adapt to bigger spread width or bigger bandwidth chirp pulse amplifier, many times repeat, expand the use number of times of compression grating, obtain bigger compression under the condition that the grating spacing of compressor is unchangeable, can be compatible with bigger spread width of chirp pulse amplifier, solve the problem of design limit of chirp pulse amplifier, promote femtosecond laser output single pulse energy.

The invention provides a phase delay self-compensating vector polarized light parametric chirped pulse amplifier which comprises a narrow-band pulse laser, a broadband pulse laser generating device, a half-wave plate, a polarization beam splitter, a pulse stretcher, a laser mode converter, a first nonlinear crystal, a second nonlinear crystal and a pulse compressor. The phase delay introduced by the second-stage optical parameter chirped pulse amplification to the two orthogonal polarization components of the vector polarization signal light is used for counteracting the dynamic phase delay accumulated in the first-stage optical parameter chirped pulse amplification process. The objective of the invention is to solve the problem of polarization distortion of vector polarized light caused by different accumulated phase delays of all frequency components in the optical parameter chirped pulse amplification process, so that the vector polarized light can obtain broadband high-gain amplification while the initial polarization characteristic of the vector polarized light is kept unchanged. Vector polarized light parametric chirped pulse amplification with high polarization purity and high peak power is realized.

The invention discloses a self-excited oscillation and acoustic vortex ring synergetic fluid enhanced flotation treatment device and a self-excited oscillation and acoustic vortex ring synergetic fluid enhanced flotation treatment method. The device comprises a feeding mechanism, a feeding conveying pipe, a volute pre-rotating mechanism, a stepped ultrasonic strengthening mechanism, a Helmholtz cavity pulsating amplifier and a main body flotation mechanism, wherein the volute pre-rotating mechanism and the stepped ultrasonic strengthening mechanism are sequentially arranged on the feeding conveying pipe in the feeding direction, the Helmholtz cavity pulsating amplifier is arranged on the volute pre-rotating mechanism, and the main body flotation mechanism is connected with the tail end of the feeding conveying pipe. The Helmholtz cavity pulsating amplifier comprises a teardrop type shell, a reducing neck pipe communicated with an amplifier inlet in the upper portion of the teardrop type shell, an auxiliary self-suction air inlet assembly arranged on the periphery of a throat pipe part of the reducing neck pipe, a flow stabilizing assembly arranged in the teardrop type shell and a pressure sensor arranged on the teardrop type shell. The method is particularly suitable for mineral flotation, wastewater air flotation treatment, biological reaction enhancement and other scenes, and accurate generation and efficient collision mineralization of micron-sized bubbles can be achieved by cooperatively regulating and controlling bubble size distribution and the particle-bubble collision dynamic process.

There is described a laser pulse generator, comprising: one or more seed laser sources for generating a plurality of sequentially-timed seed pulses; input optics arranged to direct the plurality of sequentially-timed seed pulses through gain medium; the gain medium configured to be pumped by pump diodes to increase the energy of the pulses; and synchronisation optics arranged to guide the plurality of pulses from the gain medium along respective delay paths to temporally synchronise the pulses at one or more targets. Spatial recombination may also be included. Corresponding methods are described.

Delivery systems comprising pulse producer and first pulse supplier including first optical fiber path, first pulse amplifier and first delivering end. Pulse producer produces first low-power laser pulse having power predefined to avoid or minimize deformation of first low-power laser pulse. First pulse amplifier amplifies first low-power laser pulse to produce first high-power laser pulse having power predefined to operate first end-component connectable with first delivering end. First optical fiber path has initial section to convey first low-power laser pulse from pulse producer to first pulse amplifier, and final section to convey first high-power laser pulse from first pulse amplifier to first delivering end. First pulse amplifier is arranged at a position along first optical fiber path corresponding to distal position relative to pulse producer or proximal position relative to first delivering end. Methods and computer programs suitable for being performed by / at such delivery systems.