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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 17, Iss. 9 — Sep. 1, 2000
  • pp: 1509–1516

High-order harmonic generation by atoms with strong high-frequency and low-frequency pumping

Vladimir D. Taranukhin and Nickolay Yu. Shubin  »View Author Affiliations

JOSA B, Vol. 17, Issue 9, pp. 1509-1516 (2000)

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We propose to use a low-frequency radiation in addition to the basic pump to enhance the efficiency of high-order harmonic generation following atom tunnel above-threshold ionization. This enhancement can be achieved without an increase of basic pump intensity and, consequently, without additional saturation of ionization. A static field added to the basic pump modifies photoelectron trajectories in the continuum that leads to a high-frequency extension of harmonic spectrum. This is caused by an increase in the part of recombining photoelectrons, kinetic energy of such electrons, and recombination efficiency (owing to reduced electron wave-packet spreading). An experimental realization of this effect is proposed with use of the radiation of a powerful CO<sub>2</sub> laser and ultrashort basic pump pulses. It is shown that the maximum-generated frequency can be tripled with this technique. Also, a multiplateau structure of the high-frequency region of the harmonic spectrum has been revealed and explained.

© 2000 Optical Society of America

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(190.4180) Nonlinear optics : Multiphoton processes
(270.4180) Quantum optics : Multiphoton processes
(270.6620) Quantum optics : Strong-field processes

Vladimir D. Taranukhin and Nickolay Yu. Shubin, "High-order harmonic generation by atoms with strong high-frequency and low-frequency pumping," J. Opt. Soc. Am. B 17, 1509-1516 (2000)

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