Amplification of high-order harmonics in a short laser pulse by stimulated interaction

E. A. Nersesov, S. V. Popruzhenko, D. F. Zaretsky, W. Becker, and P. Agostini
Phys. Rev. A 64, 023419 – Published 17 July 2001
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Abstract

The case is considered of a weak Gaussian harmonic pulse of frquency (2s+1)ω passed through an atomic medium collinearly with an intense Gaussian laser pulse of frequency ω. The harmonic beam may be amplified or deamplified according to the balance between stimulated emission and absorption. A simple analytic expression for the gain is derived in the tunneling limit of ionization. It predicts a positive (negative) gain for positive (negative) delay of the harmonic pulse with respect to the laser pump pulse. The gain may be significant and proportional to the delay for delays of a few laser periods, much shorter than the pulse envelopes. Possibilities for experimental observations are briefly discussed.

  • Received 28 February 2001

DOI:https://doi.org/10.1103/PhysRevA.64.023419

©2001 American Physical Society

Authors & Affiliations

E. A. Nersesov and S. V. Popruzhenko

  • Moscow Engineering Physics Institute, Kashirskoe Shosse 31, 115409, Moscow, Russia

D. F. Zaretsky

  • Russian Research Center “Kurchatov Institute,” 123182, Moscow, Russia

W. Becker*

  • Max-Born-Institut, Max-Born-Strasse 2a, 12489 Berlin, Germany

P. Agostini

  • SPAM, Centre d’Etudes de Saclay, 91191 Gif-sur-Yvette, France

  • *Also at Center for Advanced Studies, Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131.

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Vol. 64, Iss. 2 — August 2001

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