3 results about "Pulse amplifiers" patented technology

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.

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.