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Phys. Rev. A 65, 052903 (2002) [5 pages]

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

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P. P. Rajeev, S. Banerjee*, A. S. Sandhu, R. C. Issac†, L. C. Tribedi, and G. R. Kumar‡
Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India

Received 22 February 2001; revised 7 June 2001; published 6 May 2002

Hard x-ray emission in the energy range of 30–300 keV from copper plasmas produced by 100-fs, 806-nm laser pulses at intensities in the range of 1015-1016 W cm-2 is investigated. We demonstrate that surface roughness of the targets overrides the role of polarization state in the coupling of light to the plasma. We further show that surface roughness has a significant role in enhancing the x-ray emission in the above mentioned energy range.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.052903
DOI:
10.1103/PhysRevA.65.052903
PACS:
79.20.Ds, 52.25.Os, 52.38.-r, 52.50.Jm

*Present address: CUOS, University of Michigan, Ann Arbor, MI.

†Present address: Department of Physics, University of Strathclyde, Scotland, U.K.

‡Electronic address: grk@tifr.res.in

 
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