The Effect of Chirped Intense Femtosecond Laser Pulses on the Argon Cluster

H Ghaforyan,R Sadighi-Bonabi,E Irani

doi:10.1155/2016/2609160

H Ghaforyan, R Sadighi-Bonabi + Show 1 more

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https://doi.org/10.1155/2016/2609160

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Abstract

The interaction of intense femtosecond laser pulses with atomic Argon clusters has been investigated by using nanoplasma 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−2are studied. The analytical calculation provides ionization rate for 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 is 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 pulses are improved up to 20% in comparison to the unchirped and positively chirped pulses.

Highlights

Developments of ultrashort intense laser pulses through CPA and OPCPA techniques have attracted increasing attention in the main subject of laser-matter interaction [1]
Moll et al reported the effect of excitation and deexcitation processes on the dynamic of laser-cluster interaction. They found that, with considering the excited states, the ionization dynamics is accelerated and the higher ionic charge states are reached at the end of the laser-cluster interaction
In order to clarify the lasercluster interaction, electron and ion density, electron energy, and radius of cluster are modified by manipulating the characters of laser fields, such as intensity, pulse duration, and chirp parameter via using nanoplasma model

Summary

Introduction

Developments of ultrashort intense laser pulses through CPA and OPCPA techniques have attracted increasing attention in the main subject of laser-matter interaction [1]. One of the efficient attractive methods, interaction of intense laser pulses with large atomic clusters, has opened up several areas of laser plasma science such as electron and ion accelerators [15,16,17], tabletop neutron sources [18], plasma waveguides [19], and Xray sources [20,21,22]. In order to clarify the lasercluster interaction, electron and ion density, electron energy, and radius of cluster are modified by manipulating the characters of laser fields, such as intensity, pulse duration, and chirp parameter via using nanoplasma model.

Theory of Laser-Cluster Interaction

Simulation Results

Conclusion