Abstract
The development of intense (⪆ 1015 W/cm2) ultrashort-pulse (⪅ 1 ps) laser systems has opened up possibilities for experiments on plasma creation in which multiphoton or tunneling ionization plays a dominant role. This paper presents a one-dimensional model which couples Maxwell’s equations and multiphoton ionization rates in order to simulate the propagation of a femtosecond laser pulse through an initially-neutral atmospheric-density rare gas. There are two distinct aspects to this problem: the plasma-induced self-phase modulation of the laser pulse, which leads to a blue shift and spectral broadening; and the properties of the plasma, in particular, the relatively low temperature and high degree of ionization.
© 1992 IQEC
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