Abstract
We study numerically the effects of guiding and amplification of short terahertz (THz) pulses in nonequilibrium photoionized plasma channels formed in xenon by powerful femtosecond UV laser pulses. The performed investigations are based on the numerical code for the second-rder wave equation solution within the cylindrical geometry in spatially nonuniform and nonequilibrium plasma. We analyze the specific features of THz pulse spectrum evolution during its propagation and study the dependence of the amplification threshold on plasma parameters. We demonstrate that in addition to the amplification effect such nonequilibrium plasma reveals focusing features at relaxation times, which will make it possible to use it as a waveguide for efficient signal transportation.
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