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Laser Physics

Strong-field interference stabilization of Rydberg atoms and the pulse-propagation problem

Mikhail Vladimirovich Fedorov

Published Jun 1, 2006• 2 citations
Publisher

Abstract

Theoretical and experimental works on interference stabilization are surveyed. Both quantum and classical approaches are discussed. Generalization to two-color interference stabilization is described, and a very high degree of achievable stabilization is demonstrated. Possible applications to the pulse propagation problem are briefly discussed.

DOI
10.1134/s1054660x06060065

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Journal of Physics B Atomic Molecular and Optical Physics•Jul 14, 1996•30 citations
Theoretical and experimental works on interference stabilization are surveyed. Both quantum and classical approaches are discussed. Generalization to two-color interference stabilization is described, and a very high degree of achievable stabilization is demonstrated. Possible applications to the pulse propagation problem are briefly discussed.
The key subject of these lectures is Interference Stabilization (IS) of atoms in a strong laser field. Physics of the phenomenon, its various manifestations, as well as many related subtopics will be discussed. Generalizations to the case of two-colour interference stabilization will be briefly described. As it will be shown, owing to the achievable in this case very high degree of stabilization, the phenomenon appears to be very promising for making progress in such an important field as propagation of laser pulses in a gas medium. Since the first work on IS (Fedorov and Movsesian, 1988), there have been a lot of publications on this subject. I am not going to mention here all the relevant papers.
Interference stabilization of Rydberg atoms in a sufficiently strong laser field is revisited. Its main features predicted theoretically and observed experimentally are described together with the newest experimental and theoretical results. The most important new results concern the found efficient population of atomic Rydberg levels in the process of multiphoton ionization and interference stabilization of population at Rydberg levels. Another important new topic is the interference stabilization at vibrational levels of dissociating molecules.
The existing theoretical and experimental works on interference stabilization of Rydberg atoms are overviewed. Physical origin of the phenomenon, its main features and the conditions of existence, as well as the main theoretical approaches used for its description are discussed. These ideas are used to describe interference stabilization of molecules with respect to photodissociation. Specific calculations are carried out for the hydrogen molecular ion H2+. The main features of strong‐field photodissociation are described. The conditions of stabilization and destabilization of a molecule are found and related to features of the initial‐state molecular vibrational wave function.
The main ideas and features of strong-field interference stabilization of Rydberg atoms are described. Both analytical and model calculations, as well as exact numerical solutions of the Schördinger equation are discussed and compared with each other. Experiments of the FOM Institute groups (The Netherlands) on stabilization of Ba and Ne atoms excited initially, correspondingly, to 27d and 5g levels are discussed. In both cases mechanisms of stabilization are argued in favor of different kinds of interference phenomena rather than adiabatic stabilization.
Interference stabilization of atoms is investigated numerically. Raman-type transitions to Rydberg states with higher values of the electron orbital momentum are taken into account. These transitions are shown to change qualitatively theoretical predictions concerning the dependence of the time of ionization on the light-field-strength amplitude : if the weak-field time of ionization, as usual, is a falling function of , in a strong-field region the function is predicted to be more or less constant and of the order of the classical Kepler period in a rather large interval of , in contrast with the earlier prediction according to which, in a strong field, was assumed to be a rather fast growing function. The results derived are shown to be in a rather good agreement with the existing experiments. Alternative theoretical models are discussed.