Publication Date:
2016-10-12
Description:
With high-order harmonic generation (HHG) from plasma surfaces, it is possible to turn a laser pulse into a train of attosecond or even zeptosecond pulses in the backward radiation. These attosecond pulses may be several orders of magnitude higher than that of the laser pulse under appropriate conditions. We study this process in detail, especially the nanobunching of plasma electron density. We derive an analytical expression that describes the electron density profile and obtain a good agreement with particle-in-cell simulation results. We investigate the most efficient case of HHG at moderate laser intensity ( I ≈ 2 × 10 20 W / cm 2 ) on the over-dense plasma slab with an exponential profile pre-plasma. Subsequently, we calculate the spectra of a single attosecond pulse from the backward radiation using our expression for density shape in combination with the equation for the spectrum of nanobunch radiation.
Print ISSN:
1070-664X
Electronic ISSN:
1089-7674
Topics:
Physics
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