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Laser plasma interaction in copper nano-particle targets

Published online by Cambridge University Press:  29 July 2008

S. Chaurasia ,
D.S. Munda ,
P. Ayyub ,
N. Kulkarni ,
N.K. Gupta  and
L.J. Dhareshwar
S. Chaurasia*
Affiliation:
Laser and Neutron Physics Section, Physics Group, Bhabha Atomic Research Centre, Mumbai, India
D.S. Munda
Affiliation:
Laser and Neutron Physics Section, Physics Group, Bhabha Atomic Research Centre, Mumbai, India
P. Ayyub
Affiliation:
Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Mumbai, India
N. Kulkarni
Affiliation:
Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Mumbai, India
N.K. Gupta
Affiliation:
Laser and Neutron Physics Section, Physics Group, Bhabha Atomic Research Centre, Mumbai, India
L.J. Dhareshwar
Affiliation:
Laser and Neutron Physics Section, Physics Group, Bhabha Atomic Research Centre, Mumbai, India
*
Address correspondence and reprint requests to: S. Chaurasia, Laser & Neutron Physics Section, Purnima Building, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India. E-mail: [email protected]
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Abstract

In this paper, we present the results of studies on ion emission characteristics of a laser plasma produced from a copper nano-particle layer of 1–3 µm thickness coated over polished surface of a solid copper target. Laser intensity of 1013–1014 W/cm2 was produced on the targets by a 2 J Nd:glass laser having a variable pulse duration of 300–800 ps. Nano-particle size was in the range of 15–25 nm. Ion emission from the nano-particle plasma was compared with plasma generated from a polished copper target. Ion emission from the nano-structured target was observed to depend on the polarization of the incident laser beam. This effect was stronger for a shorter laser pulse. X-ray emission was measured in the soft and hard X-ray region (0.7 to 8 keV) using various X-ray filters. A nano-particle coated target is found to yield a larger flux as well as velocity of ions as compared to polished target when the laser polarization is parallel to the plane containing target normal and detector axis. However, no X-ray enhancement has been observed in the wavelength range 1.5 to 20 Å.

Keywords

Ion emissionLaser-plasma interactionLaser-plasmaNano-particles
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 3 , September 2008 , pp. 473 - 478
Copyright
Copyright © Cambridge University Press 2008

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