D. Bauer et al., GENERATION OF ULTRASHORT LIGHT-PULSES BY A RAPIDLY IONIZING THIN FOIL, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 58(2), 1998, pp. 2436-2440
A thin add dense plasma layer is created when a sufficiently strong la
ser pulse impinges on a solid target. The nonlinearity introduced by t
he time-dependent electron density leads to the generation of harmonic
s. The pulse duration of the harmonic radiation is related to the rise
time of the electron density and thus can be affected by the shape of
the incident pulse and its peak field strength. Results are presented
from numerical particle-in-cell simulations of an intense laser pulse
interacting with a thin foil target. An analytical model that shows h
ow the harmonics are created is introduced. The proposed scheme might
be a promising way towards the generation of attosecond pulses.