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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Interference stabilization of Rydberg atoms induced by a strong laser field

Mikhail Vladimirovich Fedorov

Published May 6, 1996• 0 citations
Publisher

Abstract

Interference stabilization of atoms is discussed. Raman-type transitions to Rydberg states with higher values of the electron orbital momentum l are taken into account in numerical calculations. These transitions are shown to change qualitatively theoretical predictions concerning the dependence of the time of ionization ti on the light field-strength amplitude (epsilon) 0: the time of ionization is shown to be a falling function of (epsilon) 0 in the weak-field region and, then, in a rather large interval of (epsilon) 0, to be approximately constant. The results derived are shown to be in a rather good agreement with the existing experiments.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

DOI
10.1117/12.239728

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Physical Review A•Jun 2, 2006•3 citations
Interference stabilization of atoms is discussed. Raman-type transitions to Rydberg states with higher values of the electron orbital momentum l are taken into account in numerical calculations. These transitions are shown to change qualitatively theoretical predictions concerning the dependence of the time of ionization ti on the light field-strength amplitude (epsilon) 0: the time of ionization is shown to be a falling function of (epsilon) 0 in the weak-field region and, then, in a rather large interval of (epsilon) 0, to be approximately constant. The results derived are shown to be in a rather good agreement with the existing experiments.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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.
Excitation and photoionization of Rydberg wave packets are described. Interference of bound-free transitions from many coherently populated Rydberg levels is shown to affect the dependence of the photoionization probability on the duration of interaction. Strong-field interference effects in such a system are described also. The most important of these is the field-induced interference stabilization of Rydberg atoms in a strong ionizing field. The intensity range in which this effect can exist is determined. The results derived are used for a qualitative model describing supercontinuum emission in the process of multiphoton ionization.
Photoionization of Rydberg atoms is considered in the framework of the quasiclassical (WKB) approach. Distribution of the photoelectron density in space and time is found and analyzed. This distribution is shown to consist of two main parts: the temporary population, which exists only as long as the light field is on; and the population corresponding to irreversible ionization. The irreversible-ionization wave packets are shown to experience the effect referred to as Coulomb narrowing. An origin of this effect and the conditions of its existence are discussed. In a strong field, rather simple analytical expressions are found for the partial probabilities of above-threshold ionization and for the total probability of ionization. In contrast to many earlier works, in the present theory neither the rotating-wave nor ``pole'' approximations are used, and the results are derived for an arbitrary pulse shape. Strong-field interference stabilization of Rydberg atoms is confirmed to occur at pulse durations shorter than the Kepler period. The arising regimes of interference stabilization are analyzed in comparison with the predictions of earlier works.
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 effect of interference stabilization is shown to exist in a system of two atomic levels coupled by a strong two-color laser field, the two frequencies of which are close to a two-photon Raman-type resonance between the chosen levels, with open channels of one-photon ionization from both of them. We suggest an experiment, in which a rather significant (up to 9090%90) suppression of ionization can take place and which demonstrates explicitly the interference origin of stabilization. Specific calculations are made for H and He atoms and optimal parameters of a two-color field are found. The physics of the effect and its relation with such well-known phenomena as light induced continuum structure and population trapping in a three-level system are discussed.
In this paper we investigate how Rydberg atoms respond to perturbation by two contrapropagating ultrashort laser pulses. We consider the case where the durations of both pulses ${\ensuremath{\tau}}_{1}$ and ${\ensuremath{\tau}}_{2}$ are shorter than the inverse of the initial-state energy ${\ensuremath{\epsilon}}_{i}^{\ensuremath{-}1}$. When acting alone such a pulse passes through the atom without noticeable alteration in the atomic state. The situation is different if two such pulses interfere in the region of atom localization. In this case the atomic response is significantly enhanced. This is due to the nonzero momentum transferred to the electron by the interplay of the electric field of one pulse and the magnetic field of the other. The sudden perturbation approximation is used to evaluate the transition probabilities. They are shown to depend on the atom position with respect to the pulse interference region. This dependence is determined by the relationship between the atomic diameter di{d}_{i}di​ and the interference-region size $l=c({\ensuremath{\tau}}_{1}+{\ensuremath{\tau}}_{2})$ (ccc is the speed of light). If ${d}_{i}\ensuremath{\ll}l$ this dependence is sensitive to the function form of the pulses. For sufficiently strong fields the atoms can be ionized completely. In the opposite case of ${d}_{i}\ensuremath{\gg}l$ the transition probabilities are sensitive to the electron density distribution along the propagation direction. The probabilities of the initial-state destruction and atom ionization drop as l∕dil∕{d}_{i}l∕di​ irrespective of the characteristics of the pulses.