Abstract
We report a study of hot electron generation via the interaction of femtosecond laser pulses of subrelativistic intensity (1015 to 2×1017 W cm-2), having different linear polarisations and nanosecond-scale contrasts, with the surface of 'transparent' (quartz glass) and 'absorbing' (silicon) targets. As the incident pulse intensity increases from 1015 to 1017 W cm-2, the difference in hard X-ray yield and average hot electron energy between s- and p-polarised beams rapidly decreases. This effect can be understood in terms of relativistic electron acceleration mechanisms.
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