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Sub-10-attosecond pulses with half-cycle electric fields provide exceptionaloptions to detect and manipulate electrons in the atomic timescale. However,the availability of such pulses is still challenging. Here, we propose a methodto generate isolated sub-10-attosecond half-cycle pulses based on a cascadeprocess naturally happening in plasma. A 100s-attosecond pulse is firstgenerated by shooting a moderate overdense plasma with a one-cycle femtosecondpulse. After that, the generated attosecond pulse cascadedly produce asub-10-attosecond half-cycle pulse in the transmission direction by unipolarlyperturbing a nanometer-thin relativistic electron sheet naturally form in theplasma. Two-dimensional particle-in-cell simulations indicate that an isolatedhalf-cycle pulse with the duration of 8.3 attoseconds can be produced. Apartfrom one-cycle driving pulse, such a scheme also can be realized with acommercial 100-TW 25-fs driving laser by shaping the pulse with a relativisticplasma lens in advance.

Cascaded Generation of a Sub-10-Attosecond Half-Cycle Pulse