Active resonant cavity based self-similarity ultrashort pulse amplification system and working method therefor

Abstract

The invention discloses an active resonant cavity based self-similarity ultrashort pulse amplification system and a working method therefor. The self-similarity ultrashort pulse amplification system is characterized by comprising an optical frequency comb-shaped generator, a pre-chirping management apparatus, an active optical resonant cavity and a dispersion compensation apparatus that are connected in sequence, wherein the active optical resonant cavity is also connected with an electronic control circuit and a pump laser. The active resonant cavity based self-similarity ultrashort pulse amplification system has the advantages that an outer cavity enhancement technique is adopted, so that the self-similarity amplification for the ultrashort pulse is realized by using solid gain mediums, and the gain narrowing is overcome; the nonlinear widening of spectrum in the amplification process is realized, the pulse contract ratio is improved, and the problems of unstable modes, self-focusing and the like existing in the high-power amplification process of an optical fiber amplifier are effectively restrained; and the self-similarity ultrashort pulse amplification system is used as a reliable scientific research tool for researching high-field laser physics and non-linear optics.

Description

technical field [0001] The invention belongs to the field of ultrafast laser technology, and in particular relates to a self-similar ultrashort pulse amplification system based on an active resonant cavity and a working method thereof. Background technique [0002] With the rapid development of laser technology, ultra-short pulse light sources with extremely high peak power and extremely narrow pulse width have directly brought research and industrial production into the field of microscopic ultrafast processes. In recent years, with the reduction of laser pulse width to tens of femtoseconds or even several femtoseconds, ultrashort pulses play an increasingly important role in the fields of optical fiber communication, nonlinear optics, optical sensing, micro-nano processing, medical treatment, and laser measurement. important role. [0003] The current high peak power ultrashort pulse laser amplification system mainly uses chirped pulse amplification technology (CPA chirpe...

AI Technical Summary

Problems solved by technology

However, the existing self-similar amplifiers require the pulse to pass through a sufficiently long gain fiber, and form a self-similar evolution under the combined effects of positive dispersion, nonlinear effects, and gain

However, the existing gain fibers, such as single-mode gain fibers, double-clad fibers, and large-mode field photonic crystal fibers, are limited by self-focusing and mode instability effects at high power levels, resulting in deterioration of the output spot quality.

This defect severely limits the use of self-similar amplification techniques to obtain ultrashort pulses with high peak power

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