Transient Gas-Dynamics Filamentation of High-PowerFemtosecond Laser Pulse in Compressed Argon

TL;DR

This study explores how high-pressure argon gas influences femtosecond laser filamentation, revealing spectrum broadening and turbulence effects, with potential for controlling supercontinuum generation.

Contribution

It combines experimental and computational analysis to understand filamentation dynamics in compressed argon, proposing a method to control supercontinuum spectra.

Findings

Spectrum broadening up to 80 nm proportional to gas pressure

Development of turbulence affects filamentation and spectrum

Simulation reveals turbulence dynamics during pressure changes

Abstract

We have experimentally investigated the spectral characteristics and spatial structure of femtosecond pulses from a titanium:sapphire laser during filamentation in an optical cell filled with argon at pressures up to 40 atm under pressure shock-drop conditions. This leads to the development of strong jet flows and vortex gas turbulence, which in turn triggers the early onset of multiple filamentation of the optical pulse and largescale broadening of its spectrum throughout the entire duration of the pressure drop. The magnitude of this spectrum broadening can reach 80 nm and is proportional to the initial gas pressure. Using computational fluid dynamics simulations, we studied the dynamics of the emergence, development, and relaxation of stimulated turbulence in compressed gas in the region of the cell outlet valve and assessed the effect it exerts on the propagating femtosecond pulse. The revealed regularities may serve as the basis for developing an effective method of controlling the spectrum of supercontinuum radiation via filamentation of highpower ultrashort laser pulses in gas cells under shock pressure release and rise conditions.