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Effect of laser pulse time profile on its absorption by argon clusters

Published online by Cambridge University Press:  13 July 2011

Gaurav Mishra ,
Amol R. Holkundkar  and
N.K. Gupta
Gaurav Mishra*
Affiliation:
Theoretical Physics Division, Bhabha Atomic Research Centre, Mumbai, India
Amol R. Holkundkar
Affiliation:
Department of Physics, Umeå University, Umeå, Sweden
N.K. Gupta
Affiliation:
Theoretical Physics Division, Bhabha Atomic Research Centre, Mumbai, India
*
Address correspondence and reprint requests to: Gaurav Mishra, Theoretical Physics Division, Bhabha Atomic Research Centre, Mumbai-400 085, India. E-mail: gauravm@barc.gov.in
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Abstract

The interaction of medium sized Argon clusters (30 Å) with high-intensity femtosecond laser pulses (806 nm, 8 × 1016 W/cm2) of durations ranging from 10 fs to 120 fs have been studied using a three-dimensional relativistic time dependent molecular dynamic approach. The dynamics of cluster expansion is explained in terms of temporal evolution of electron population in the cluster and snapshots of particle positions at various times. The effects of inter-cluster distance on ionization dynamics are presented. It is observed that the collisional ionization increases with decreasing inter-cluster distance. The effect of pulse duration on laser energy absorption is also studied. For a laser pulse of gaussian time profile, there exists an optimum pulse duration for maximum absorption. No such optimum exists for a nearly flat top (super-gaussian) laser pulse. Results indicate the existence of resonance absorption inside the cluster. It is also observed that the high energy component of ion emission from cluster is anisotropic, showing a preferential direction of emission along laser polarization while the low energy ions emerge almost isotropically.

Keywords

Anisotropic emissionClusterCluster dynamicsFemtosecond laserResonance absorption
Type
Research Article
Information
Laser and Particle Beams , Volume 29 , Issue 3 , September 2011 , pp. 305 - 313
Copyright
Copyright © Cambridge University Press 2011

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