THz high-repetition frequency and high-power femtosecond fiber laser based on dispersive waves

Abstract

The invention discloses a THz high-repetition frequency and high-power femtosecond fiber laser based on dispersive waves. The laser comprises an Erbium-doped fiber laser seed source, a frequency enhancement part, an amplification part and a pulse width compression part, wherein the output end of the Erbium-doped fiber laser seed source is connected with the frequency enhancement part via a high non-linear fiber, the output end of the frequency enhancement part is connected with the amplification part, the amplification part comprise a pre-amplification part and a two-stage main amplification part, and the output end of the amplification part is connected with the pulse width compression part; a laser signal generated by the Erbium-doped fiber laser seed source is subjected to non-linear frequency conversion of the high non-linear fiber, and the frequency of the laser signal is enhanced to THz high repetition frequency via the frequency enhancement part, the frequency of the laser signal of the THz high repetition frequency is amplified via the pre-amplification part and the two-stage main amplification part of the amplification part, and the laser signal is further processed by thepulse width compression part to output a high-power femtosecond pulse signal of the THz high repetition frequency. The laser provided by the invention is simple in installation structure, prone to implement, low in cost and convenient to popularize.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a THz high repetition frequency and high power femtosecond fiber laser based on dispersion waves. Background technique [0002] High-power femtosecond fiber laser has the advantages of high beam quality, good thermal stability, high peak power, compact structure, low cost, good environmental stability, and no maintenance. It is used in precision machining, waveguide etching, supercontinuum generation and laser Sensing and other fields have become more and more widely used, and have gradually attracted the attention of researchers. At present, the erbium-doped fiber in the 1550nm band has positive and negative dispersion fibers. By selecting fibers with different lengths and different dispersions, the dispersion value in the fiber laser resonator can be better controlled to achieve femtosecond laser signal output. For the 1064nm band, the dispersion value of the optical fiber in t...

AI Technical Summary

Problems solved by technology

High-order harmonic mode-locking needs to greatly increase the pumping power of the pump laser on the basis of fundamental-frequency mode-locking. Since it is not in the fundamental-frequency working state, the uniformity and stability of the output laser signal are poor; and the pumping The increase in power will increase the pulse energy in the entire laser resonator, which will affect the service life of passive mode-locking components and generate multiple pulses

Shortening the length of the resonant cavity can effectively increase the repetition frequency of the mode-locked pulse, but the shorter the cavity, the fewer modes that participate in the mode-locking, and the difficulty of mode-locking will increase accordingly.

In addition, it is difficult to achieve a particularly high repetition rate for harmonic mode-locking and short-cavity mode-locking, which is limited by its own mechanism. It is difficult to achieve a repetition rate of THz with these two methods

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