Plasma channels under filamentation of infrared and ultraviolet double femtosecond laser pulses

TL;DR

This study investigates how plasma channels created by focused UV and IR femtosecond laser pulses influence subsequent plasma formation, revealing different dependencies of transparency and plasma density based on wavelength and timing.

Contribution

It provides new experimental insights into the interaction between plasma channels generated by UV and IR femtosecond pulses at different time delays.

Findings

Optical transparency of the first channel varies with wavelength and delay.

Plasma density of the second channel depends on the initial plasma conditions.

Differences observed between UV and IR pulse interactions.

Abstract

An influence of plasma channel created by a filament of focused UV or IR femtosecond laser pulse ({\lambda}=248 nm or 740 nm) on characteristics of other plasma channel formed by a femtosecond pulse at the same wavelength following the first one with varied nanosecond time delay was experimentally studied. A dependence of optical transparency of the first channel and plasma density of the second channel on the time delay was demonstrated to be quite different for such a double UV and IR femtosecond pulses.