Enhanced - emission from "smoked" targets irradiated with , laser pulsesF. Y. Khattak1, R. J. Clarke2, E. J. Divall2, M. Edwards3, P. S. Foster2, C. J. Hooker2, A. J. Langley2, P. Mistry3, D. Neely2, O. A. M. B. Percie du Sert1, J. Smith2, C. Spindloe2, G. Tallents3, M. Tolley2 and D. Riley1
1 School of Mathematics and Physics, Queen's University of Belfast University Road, Belfast, BT7 1NN, UK
2 Central Laser Facility, CLRC Rutherford Appleton Laboratory Chilton, Didcot, Oxon, OX11 0QX, UK
3 Department of Physics, University of York - Heslington, York YO10 5DD, UK
received 1 July 2005; accepted in final form 31 August 2005
published online 21 September 2005
We present a study of -like 1s2-1s2p line emission from solid and low-density targets under laser pulse irradiation with a frequency doubled :Sapphire laser. By varying the beam spot, the intensity on target was varied from to . At best focus, low density "smoked" targets yield times more - than the foil targets when irradiated at an angle of with s-polarized pulses. The duration of - emission from smoked targets, measured with a fast streak camera, was similar to that from foils.
52.38.Ph - X-ray, -ray and particle generation.
52.25.Os - Emission, absorption, and scattering of electromagnetic radiation.
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