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With the generation of high order harmonics (HHG) on the plasma surface it ispossible to turn the laser pulse into a train of attosecond or even zeptosecondpulses in the back radiation. These attosecond pulses may have amplitudeseveral orders of magnitude larger than that of the laser pulse underappropriate conditions. We study this process in detail, especially thenanobunching of the plasma electron density. We derive the analyticalexpression that describes the electron density profile and obtain a goodagreement with particle-in-cell simulations. We investigate the most efficientcase of HHG at moderate laser intensity (a0 = 10) on the over dense plasma slabwith an exponential profile per-plasma. Subsequently we calculate the spectraof single attosecond pulses from back radiation using our expression fordensity shape in combination with the equation for spectrum of nanobunchradiation.

Reflected attosecond pulse radiation from moving electron layers