The effect of chirped intense femtosecond laser pulses on the Argon cluster

TL;DR

This study investigates how intense femtosecond laser pulses, especially chirped pulses, influence Argon clusters, revealing that negatively chirped pulses enhance electron energy and cluster size by up to 20% compared to unchirped pulses.

Contribution

It introduces a theoretical model analyzing the effects of chirped femtosecond laser pulses on Argon clusters, highlighting the impact of pulse shape and chirp on cluster dynamics.

Findings

Negatively chirped pulses increase electron energy by up to 20%.

Cluster radius is larger with negatively chirped pulses.

Laser intensity and pulse shape significantly affect ionization and expansion.

Abstract

The interaction of intense femtosecond laser pulses with atomic Argon clusters has been investigated by using nano-plasma model. Based on the dynamic simulations, ionization process, heating and expansion of a cluster after irradiation by femtosecond laser pulses at intensities up to 2*1017 Wcm-2 are studied. The analytical calculation provides ionization ratefor different mechanisms and time evolution of the density of electrons for different pulse shapes. In this approach the strong dependence of laser intensity, pulse duration and laser shape on the electron energy, the electron density and the cluster size are presented using the intense chirped laser pulses. Based on the presented theoretical modifications, the effect of chirped laser pulse on the complex dynamical process of the interaction is studied. It is found that the energy of electrons and the radius of cluster for the negatively chirped pulsesare improved up to 20% in comparison to the unchirped and positively chirped pulses.