Generating nearly single-cycle pulses with increased intensity and strongly asymmetric pulses of petawatt levelстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Generation of petawatt-class pulses with a nearly single-cycle duration or with a strongly asymmetric
longitudinal profile using a thin plasma layer are investigated via particle-in-cell simulations and the analytical
flying mirror model. It is shown that the transmitted pulses having a duration as short as about 4 fs (1.2 laser
cycles) or one-cycle front (tail) asymmetric pulses with peak intensity of about 1021 W/cm2 can be produced by
optimizing system parameters. Here, a new effect is found for the shaping of linearly polarized laser pulses, owing
to which the peak amplitude of the transmitted pulse becomes larger than that of the incoming pulse, and intense
harmonics are generated. Characteristics of the transmitting window are then studied for different parameters of
laser pulse and plasma layer. For a circular polarization, it is shown that the flying mirror model developed for
shaping laser pulses with ultrathin foils can be successfully applied to plasma layers having a thickness of about
the laser wavelength, which allows the shape of the transmitted pulse to be analytically predicted.