Abstract
We develop a Floquet based formalism which describes a process of the generation harmonics of in an atom driven by a laser field. Using this formalism, we show that several harmonics are strongly enhanced in the spectrum when the laser frequency is such that a multiphoton resonance occurs between the initial state and a quasienergy state. We illustrate these findings by a numerical calculation of the harmonics generation in the potassium and rubidium atoms driven by a laser in the near-infrared energy range. The present formalism is also applicable when the initial state is a coherent superposition of several field-free atomic states.
Original language | English |
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Article number | 053406 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 78 |
Issue number | 5 |
DOIs | |
Publication status | Published - 11 Nov 2008 |