Enhanced hard x-ray emission from microdroplet preplasma

M. Anand, S. Kahaly, G. Ravindra Kumar, M. Krishnamurthy, A. S. Sandhu, P. Gibbon

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We perform a comparative study of hard x-ray emission from femtosecond laser plasmas in 15 μm methanol microdroplets and Perspex target. The hard x-ray yield from droplet plasmas is ≃68 times more than that obtained from solid plasmas at 2× 1015 W cm-2. A 10 ns prepulse at about 5% of the main pulse appears to be essential for hard x-ray generation from droplets. Hot electron temperature of 36 keV is measured from the droplets at 8× 1014 W cm-2, whereas a three times higher intensity is needed to obtain similar hot electron temperatures from Perspex plasmas. Particle-in-cell simulations with very long scale-length density profiles support experimental observations.

Original languageEnglish (US)
Article number181111
JournalApplied Physics Letters
Issue number18
StatePublished - May 1 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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