Yb-doped fiber laser based on pulse laser seeds in gain modulation technology

Abstract

The invention discloses a Yb-doped fiber laser based on pulse laser seeds in a gain modulation technology, which is composed of a pulse-modulated laser pumping source, a multimode fiber combiner, a fiber grating pair, a Yb-doped double clad fiber, an amplification-stage pumping source, a high-power combiner and a double clad Yb-doped fiber for amplifying laser power, wherein the pulse-modulated laser pumping source is coupled into the Yb-doped double clad gain fiber through the multimode fiber combiner so as to generate a pulse laser of which the wavelength is limited by the fiber grating pair; the generated pulse laser as a seed source is amplified by a one-stage or multistage fiber amplifier; the laser amplifier pumping source is coupled into the double clad Yb-doped fiber with large mode field diameter through the high-power combiner; and after power-level amplification, a high-power pulse laser output with adjustable repetition frequency is obtained. The invention can be used for obtaining novel high-power fiber laser pulse seeds with simple structure, low cost and high long-term stability.

Description

technical field [0001] The invention relates to a pulsed Yb-doped fiber laser, in particular to a Yb-doped fiber laser based on a pulsed laser seed of gain modulation technology. Background technique [0002] Pulsed Yb-doped fiber laser is an important rare-earth ion-doped laser with high peak power laser output for high-power laser processing and other applications. Because Yb ions have a relatively simple two-level structure and a longer upper-level fluorescence lifetime (close to 1ms), there is no fluorescence up-conversion effect, so it is beneficial to achieve very high-power laser output; its longer upper-level lifetime It is beneficial to realize high-power pulsed laser output. Compared with solid-state and gas lasers, fiber lasers have many advantages: smaller volume; large surface area to volume ratio, better heat dissipation, and no need for a huge water cooling system; better beam quality, and can get close to diffraction Extreme high-power laser output; high en...

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Problems solved by technology

Although the structure of the all-fiber acousto-optic Q-switched fiber laser is relatively simple, it needs to use an acousto-optic modulator with a pigtail, the production cost and price are relatively high, and there are certain problems in the long-term stability of the acousto-optic modulator; The pre-amplified pulse-modulated single-mode semiconductor laser needs to use a relatively expensive single-mode semiconductor laser that can be modulated at high speed. Because the output power is too small, it needs to go through one or more stages of pre-amplification to meet the power requirements of the seed source, and the structure is relatively complicated. , the cost is higher than the former

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