An investigation of the L-shell x-ray conversion efficiency for laser-irradiated tin foils

We have used the Shenguang II laser in third harmonic (351 nm) to investigate the emission ofL-shell radiation in the 3.3–4.4 keV range generated using thin foils of Sn coated onto a parylenesubstrate with irradiation of order 10¹⁵ Wcm⁻² and nanosecond pulse duration. In ourexperiment, we have concentrated on assessing the emission on the non-laser irradiated side asthis allows an experimental geometry relevant to experiments on photo-ionised plasmas where asecondary target must be placed close to the source, to achieve x-ray fluxes appropriate toastrophysical objects. Overall L-shell conversion efficiencies are estimated to be of order 1%,with little dependence on Sn thickness between 400 and 800 nm.