Abstract
The effects of laser polarization on super-hot electron (>100 keV) generationhave been studied in the interaction of femtosecond laser light (800 nm,150 fs, 6×1015W·cm-2) with a pre-formed plasma from aslab Cu target. For p-polarized laser pulses, high-energy γ-rays ofthe energy ~400 keV were detected. The electron temperatures deducedfrom the γ-ray spectra were 66 and 52 keV, respectively, in normal andreflective directions of the solid target, and hot electrons were emittedout of the plasma mainly in the normal direction. In contrast, there werenearly no γ-rays >100 keV found for s-polarized laser pulses. The hotelectron temperature was 26 keV and the emission of hot electrons wasparallel to the laser field. The superposition of resonant field withelectrostatic field excited by escaping electrons may contribute to thehigh-energy γ-ray or super-hot electron (>100 keV) generation.
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