This article is cited in 2 papers

Extreme laser radiation: physics and fundamental applications

Excitation of low-frequency residual currents at combination frequencies of an ionising two-colour laser pulse

N. V. Vvedenskii^ab, V. A. Kostin^ab, I. D. Laryushin^ab, A. A. Silaev<sup>ab

a</sup> Lobachevski State University of Nizhni Novgorod
^b Institute of Applied Physics of the Russian Academy of Sciences, Nizhnii Novgorod

Abstract: We have studied the processes of excitation of low-frequency residual currents in a plasma produced through ionisation of gases by two-colour laser pulses in laser-plasma schemes for THz generation. We have developed an analytical approach that allows one to find residual currents in the case when one of the components of a two-colour pulse is weak enough. The derived analytical expressions show that the effective generation of the residual current (and hence the effective THz generation) is possible if the ratio of the frequencies in the two-colour laser pulse is close to a rational fraction with a not very big odd sum of the numerator and denominator. The results of numerical calculations (including those based on the solution of the three-dimensional time-dependent Schrödinger equation) agree well with the analytical results.

Keywords: two-colour laser pulses, terahertz radiation, ionisation, combination frequencies, time-dependent Schrödinger equation.

Received: 15.03.2016

 English version: Quantum Electronics, 2016, 46:5, 419–425

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