The article discusses the process of generation and amplification of short THz pulses taking into account kinetic properties of plasma formed in the process of tunnel ionization by the two-color laser femtosecond pulse, namely velocity distribution of plasma electrons. Analytical and numerical solutions of the dispersive equation for longitudinal oscillations show that the accounting of plasma kinetics can lead to essential variation of the spectral characteristics of a generated pulse thus leading to a change in signal duration. Subsequent additional amplification of the formed seed THz pulse during the propagation through the nonequilibrium Xe plasma channel formed by an intense femtosecond KrF laser pulse is analyzed.
In this paper the theoretical model to consider the influence of kinetic properties of nonequilibrium two-color plasma during the THz pulses generation in the presence of static magnetic field is developed. It is shown that applying a static magnetic field on a gas along the direction of propagation of an ionizing two-color laser pulse allows one to produce two-frequency emissions in THz range with tunable central frequency and bandwidth, which are strongly dependent on electron velocity distribution function (EVDF) formed in the plasma as well as relations between collisional, plasma and cyclotron frequencies.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.