Article

Applied Physics B

, Volume 81, Issue 4, pp 469-477

First online:

Hard X-ray generation from microdroplets in intense laser fields

  • M. AnandAffiliated withTata Institute of Fundamental Research
  • , C. P. SafvanAffiliated withNuclear Science Center
  • , M. KrishnamurthyAffiliated withTata Institute of Fundamental ResearchNuclear Science Center Email author 

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Abstract

Microdroplets of 15-μm diameter are subjected to ultra-short laser pulses of intensities up to 1015Wcm−2 to produce hot dense plasma. The hot electrons produced in the microdroplet plasma result in efficient generation of hard X-rays in the range 50–150keV at an irradiance as low as 8×1014Wcm−2. The X-ray source efficiency is estimated to be about 2 ×10−7%. A prepulse that is about 11ns ahead of the main pulse strongly influences the droplet plasma and the resulting X-ray emission. For a similar laser prepulse and intensity, no measurable hard X-ray emission is observed when the laser is focused on a solid target of similar composition and this indicates that liquid droplet targets are best suited for hard X-ray generation in laser–plasma interactions.

PACS

79.20.Ds 52.25.Os 52.38.−r 52.50.Jm