A new method of diagnostics of hot electrons from a laser-produced plasma is experimentally demonstrated. Titanium-sapphire laser pulses (1 J/130 fs) irradiate copper foils backed by a dielectric. The energy distribution and direction of the hot electrons generated is determined by recording visible Čerenkov radiation with spatial resolution. The results demonstrate a change in the electron generation mechanism at relativistic intensities.
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Brandl et al. (2003) studied this question.
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