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32.80.Rm
Abstract:
Using a reaction microscope, three-dimensional (3D) electron (and ion) momentum (P) spectra have been recorded for carrier-envelope-phase (CEP) stabilized few-cycle (~5 fs), intense (~4×1014 W/cm2) laser pulses (740 nm) impinging on He. Preferential emission of low-energy electrons (Ee<15 eV) to either hemisphere is observed as a function of the CEP. Clear interference patterns emerge in P space at CEPs with maximum asymmetry, interpreted as attosecond interferences of rescattered and directly emitted electron wave packets by means of a simple model.