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Physical Review A

Probe absorption by an atom in a strong finite-linewidth laser field

Henk F. Arnoldus, Thomas F. George

Published Mar 1, 1987• 1 citation
Publisher

Abstract

The probe-absorption spectrum of an atom, immersed in a finite-bandwidth laser field and a perturber gas, is calculated. Both single-mode and multimode excitation is treated, and the solutions of the occurring stochastic multiplicative processes are obtained in closed form. Different features of the profile are discussed, and it is seen that the spectrum is not determined by the laser line shape only, but that knowledge of the higher-order stochastic properties of the driving field is required.

DOI
10.1103/physreva.35.2080

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The probe-absorption spectrum of an atom, immersed in a finite-bandwidth laser field and a perturber gas, is calculated. Both single-mode and multimode excitation is treated, and the solutions of the occurring stochastic multiplicative processes are obtained in closed form. Different features of the profile are discussed, and it is seen that the spectrum is not determined by the laser line shape only, but that knowledge of the higher-order stochastic properties of the driving field is required.
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A stochastic density-matrix equation for an atom strongly driven by finite-bandwidth squeezed light is derived. The quantum properties of the light are accounted for by a doubling of dimensions of the stochastic process for ccc-number electric field amplitudes. The possibility of obtaining reduced atomic linewidths in the absorption spectrum of the atom embedded in colored squeezed light is discussed, based on nonperturbative solutions of stochastic optical Bloch equations.