High-power Q-switched pulse optical fiber laser

Abstract

The invention belongs to the technical field of laser and provides a high-power Q-switched pulse optical fiber laser. The high-power Q-switched pulse optical fiber laser comprises a master oscillator and an optical fiber amplifying device. The master oscillator is used for generating seed pulse lasers and comprises a pumping source, a beam combiner, a broadband high reflector, a gain optical fiber, a Q-switching device, a gain flattening filter and a broadband low reflector. The optical fiber amplifying device is a single-level or multilevel optical fiber amplifier, and is used for amplifying the power of the seed pulse lasers, and outputting the seed pulse lasers. In this way, the high-power Q-switched pulse optical fiber laser can improve optical fiber stimulated brillouin scattering threshold, and improve stability and reliability.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-power Q-switched pulse fiber laser. Background technique [0002] With the development of laser technology, laser processing has gradually become popular, and in laser processing, fiber lasers play an irreplaceable role. At present, the international pulsed fiber laser adopts the technical solution of using a fiber grating (FBG) with a bandwidth of about 1-2nm as the high reflection mirror of the resonator, and using a fiber grating with a bandwidth of about 1-2nm with a relatively low reflectivity as the resonator In the resonant cavity, a fiber-coupled acousto-optic Q switch is used to realize Q-switching operation to generate light pulses on the order of tens of nanoseconds to hundreds of nanoseconds as a seed source, and then pass through the first or second dual After the cladding fiber amplifier is amplified, light pulses of a few tenths of millijoules to several mil...

AI Technical Summary

Problems solved by technology

[0003] However, the temperature stability of this pulsed fiber laser using FBG as a reflector is poor. When the environment changes, the central wavelength of the FBG is prone to drift, resulting in a difference between the central wavelength of the high reflection grating and the low reflection grating from a few tenths of a nanometer to one nanometer. The deviation of the laser causes the spectral bandwidth of the laser to be narrowed

As a result, under a certain pulse peak power, stimulated Brillouin scattering is more likely to occur, and a very high peak power is generated after amplification in the latter stage, which is easy to cause damage to the fiber. This is also the reason why the current domestic and foreign pulse fiber lasers have poor reliability. root cause

[0004] In summary, the existing lasers obviously have inconveniences and defects in actual use, so it is necessary to improve them

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