A high energy ultrashort pulse fiber laser

Abstract

The invention relates to a high-energy ultrashort pulse fiber laser which comprises a seed pulse oscillator (1), a chirped pulse stretcher (2), a fiber pre-amplifier (3), a pulse separation device (4) and a nonlinear amplification compressor (5), wherein a pulse output by the seed pulse oscillator (1) is stretched through the chirped pulse stretcher (2) and then is pre-amplified through the fiber pre-amplifier (3), then a separated pulse is generated through the pulse separation device (4), and is injected into the nonlinear amplification compressor (5) to generate a high-energy separated ultrashort pulse, the high-energy separated ultrashort pulse enters the pulse separation device (4) again for beam combination, and then high-energy ultrashort pulse laser is output. The high-energy ultrashort pulse fiber laser disclosed by the invention realizes the organic combination of chirped pulse amplification and non-linear pulse compression by adopting a pulse separation method, thereby effectively preventing the excessive high-order chromatic dispersion from being introduced in a pulse stretching process and effectively controlling the non-linear effect in a nonlinear amplification process. According to the high-energy ultrashort pulse fiber laser disclosed by the invention, a method is simple and easily operated by controlling pulse separation through an optical crystal quantity; the high-energy ultrashort pulse fiber laser can be suitable for the laser amplification of a plurality of wave bands.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a high-energy ultrashort pulse fiber laser, in particular to a fiber laser that generates high-energy ultrashort pulse laser by combining pulse separation with nonlinear amplification. Background technique [0002] High-energy ultrashort pulses have extremely important application requirements in basic scientific research, industrial precision manufacturing, and aerospace satellite communications. With the continuous innovation of laser technology and the rapid expansion of application requirements, fiber lasers have entered the field of vision for applications due to their miniaturization, portability, high energy efficiency, and maintenance-free features. Under the impact of fiber lasers, traditional laser light sources, especially solid-state lasers, have the disadvantages of large volume and high power consumption. However, solid-state lasers still play an important role in t...

AI Technical Summary

Problems solved by technology

However, the nonlinear pulse amplification scheme also has its own disadvantages, and it is difficult to achieve a laser output with a single pulse energy exceeding 1mJ

The main reason is that the high peak power pulse in the high-energy ultrashort pulse amplification process will produce non-linear effects such as self-focusing, stimulated Raman scattering, cross-phase modulation, etc., and these effects will make the pulse shape and spectrum Distortion occurs, or even destroys the laser amplification medium, and high-quality pulse compression cannot be achieved

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