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Journal of Physics B Atomic and Molecular Physics

Resonant ionisation by smooth laser pulses

D Rogus, Maciej Lewenstein

Published Oct 14, 1986• 35 citations
Publisher

Abstract

The authors discuss the multiphoton resonant ionisation of atoms by smooth laser pulses. A number of interesting coherent phenomena, such as multipeak splitting of the photoelectron spectrum are observed and studied for different laser detunings, pulse durations and AC Stark shifts.
DOI
10.1088/0022-3700/19/19/018

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The author presents a theory of resonant multiphoton ionisation by multimode laser light. He investigates N photon resonant N+1 photon ionisation for a high order bound-bound transition with the resonance dominated by the Stark shift. Two aspects of the problem are considered. He studies the bandwidth dependence for the resonant ionisation probability, approximating the multimode laser light by a chaotic field. Secondly, he investigates the effects of finite mode numbers of the multimode laser. Finally, the theory is compared with the recent experimental results of Lompre et al (1981).
Direct and resonant ionisation of atoms are considered for the case of an intense electromagnetic wave with any smooth envelope. The JWKB method (over time) is used along with other approaches to solve this problem. Various ranges of light pulse and atomic parameters lead to physically different regimes of resonant ionisation. The resonance curves describing the dependence of the ionisation probability w on the detuning parameter epsilon are obtained. A general expression for the resonance width Gamma is given which is valid for light pulses of arbitrary intensity, duration and shape.
Previous results for the shift of the ionisation potential of an atom in a laser field are used to investigate the kinematics of multiphoton ionisation in either a laser beam or a laser pulse. Previous results for a laser beam show essentially no shifts of the 'above-threshold ionisation' peaks in the electron energy distribution and only small widths. Results for a laser pulse show the possibility of large shifts and widths growing as the pulse becomes shorter. Electrons which absorb a larger number of photons are predicted to show less shifted and narrower peaks.
An experimental study of doubly resonant multiphoton ionization of Na has been carried out. Coherence effects, such as AC - Stark splitting and population trapping, have been manifested in different coupling schemes, i.e. ladder, lambda, vee configurations. These effects have been investigated in terms of their dependence on the laser intensity and resonance detuning, as well as the state of the laser polarization. The experimental results are qualitatively interpreted in terms of a few level system.