Abstract
An instantaneous charge-separated field, built up at the femtosecond-laser-irradiated surface of a copper film, was observed by time-resolved electron imaging using an energy-chirped electron probe-beam. The probe beams with effective energies of 170keV were generated by intense femtosecond laser irradiation onto a molybdenum target at an intensity of 1017W∕cm2. From the deflection of the probe electrons, the electric field was estimated to be 1.5MV∕m at a pump-laser intensity of 1015W∕cm2.
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