This article is cited in 3 papers

Extreme light fields and their applications

Control of the photoelectron dynamics for the effective conversion of short-pulse, frequency-modulated optical radiation into X-ray radiation

A. A. Silaev^ab, O. V. Meshkov^a, M. Yu. Emelin^ab, N. V. Vvedenskii^ab, M. Yu. Ryabikin<sup>ab

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

Abstract: We report a theoretical investigation of high-order harmonic generation (HHG) in the ionisation of atoms by nonlinear frequency-modulated laser pulses of short duration. It is shown that the reduction in the instantaneous value of the laser pulse frequency can lead to a significant increase in the width of the plateau in the HHG spectrum. We have found optimal parameters of frequency modulation at which photons with energies of 1 keV are efficiently generated at a relatively low laser-pulse intensity. High HHG efficiency at optimal parameters is explained by the peculiarities of atomic ionisation dynamics and acceleration of photoelectrons by a frequency-modulated laser field.

Keywords: frequency-modulated radiation, femtosecond pulses, atoms, ionisation, high harmonic generation, X-rays, attosecond pulses, numerical simulation.

PACS: 42.65.Ky, 42.65.Re, 52.38.Ph

Received: 22.02.2015

 English version: Quantum Electronics, 2015, 45:5, 393–400

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