Route to intense single attosecond pulses

A feasibility study is presented for the generation of single attosecond pulses using harmonics produced by planar targets irradiated at high intensities. The investigation focuses on the interaction of a few-optical cycles, carrierenvelope phase controlled, near-infrared laser pulse with an overdense plasma. The results obtained using an one-dimensional particle-in-cell code indicate that at laser intensities of 10²⁰ W cm^-2 a single sub-fs pulse can be generated in the 20-70 eV spectral range with an efficiency of a few per cent and with 10^-3 to 10^-4 for higher photon energies. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

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