Device for generating femtosecond pulses with high peak power and high average power

Abstract

A generation device of femtosecond pulses having the high peak power and the high average power comprises a first ytterbium doped picosecond laser and a second ytterbium doped picosecond laser, and a beam splitter, a convex mirror, a hollow optical fiber device filled with an inert gas, a concave mirror and a chirp mirror set are arranged in the laser output direction of the second ytterbium doped picosecond laser orderly. The laser outputted by the first ytterbium doped picosecond laser is in beam combination with the laser outputted by the second ytterbium doped picosecond laser at the beam splitter via a reflector, and the femtosecond pulses having the high peak power and the high average power are outputted by the convex mirror, the hollow optical fiber device filled with the inert gas, the concave mirror and the chirp mirror set. The device of the present invention has the anti-time jitter robustness, can generate the femtosecond pulses which have the high peak power, high average power and high repetition frequency and of which the light beam quality is improved and optimized, and facilitates the related research of the strong field physics.

Description

technical field [0001] The invention relates to ultra-intense and ultra-short laser pulses, in particular to a device for generating femtosecond pulses with high peak power and high average power, so as to facilitate the related research of strong field ultrafast physics. Background technique [0002] Ultrashort and ultraintense laser pulses based on Ti:Sapphire lasers have undergone rapid technological progress and have become powerful tools for many ultrafast scientific researches, such as time-resolved measurements of atomic and molecular systems, high-order harmonic generation, and laser particle acceleration. The main advantage of Ti:Sapphire laser is its wide gain bandwidth, which can generate short pulses less than 30fs. Although the peak power of these optical pulses is sufficient for probing non-perturbative physical processes, the repetition frequency and average power of the generated optical pulses are low due to the high quantum defects of Ti:sapphire lasers. H...

AI Technical Summary

Problems solved by technology

However, for picosecond pulses, the spectral broadening is very small due to the low intensity gradient of the pulse and the small nonlinearity of large-aperture hollow-core fibers

Simply increasing the input pulse energy or the air pressure of the gas filled in the hollow fiber will lead to complex spatiotemporal distribution of pulse energy and poor mode shape

[0004] Although some groups have used two-color laser pulses to broaden the spectrum through hollow-core fiber compression, they all used two femtosecond pulses to cause spectral broadening by means of self-phase modulation and cross-phase modulation effects

Images