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Effects of Atomic Coherence on Linewidth of Lassers withand without Population Inversion

Xiong Jin

Published Jan 1, 2000• 0 citations
OpenAlex

Abstract

Atomic coherence effects on three-level system in which two levels are coupled by a driving field are investigated. The linewidth of such system is in detail analyzed in dressed states. It is shown that coherence effects can lead to narrowing or widening the linewidth of lasers with and without inversion. Whether narrowing or widening depends on models and parameters. The contribution of the coherences to linewidth is smaller than that of the populations and can be neglected for a strong driving field. [WT5HZ]

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Atomic coherence effects on three-level system in which two levels are coupled by a driving field are investigated. The linewidth of such system is in detail analyzed in dressed states. It is shown that coherence effects can lead to narrowing or widening the linewidth of lasers with and without inversion. Whether narrowing or widening depends on models and parameters. The contribution of the coherences to linewidth is smaller than that of the populations and can be neglected for a strong driving field. [WT5HZ]
We show that continuous-wave, two colour excitation of three-level atoms opens new channels of irreversible population transfer between atomic levels. This process, which we describe as dynamically induced irreversibility, leads to unanticipated phenomena including the inversion of atomic transitions whose upper atomic level has no conventional source of irreversible population pumping. We also study the effect of excitation-field bandwidth on the gain exhibited by driven, three-level, V-type atomic systems. Gain, which may or may not be inversionless in the atomic-state basis, is produced through strong monochromatic driving of one atomic transition and weaker pumping of a coupled transition. It is found that monochromatic pumping frequently yields greater optical gain than incoherent (wide bandwidth) pumping. This is particularly true when system gain can be attributed to hidden inversions among the eigenstates (semi-classical dressed states) of the coupled atom+driving field quantum system. Last, we report the observation of continuous-wave lasing in a strongly driven barium cascade system and interpret its properties in terms of the models presented.
The steady-state behavior of a simple three-level atomic system has been investigated by taking into account the effect of phase fluctuations in the driving field. For a monochromatic driving field, lasing with or without inversion can be established over a wide frequency range for the probe and driving fields. A large refractive index can also be generated even if the population inversion is positive. For a finite linewidth of the driving field, the refractive index enhancement tends to decrease. Furthermore, a behavior change from inversion laser to noninversion laser can occur as the driving field linewidth increases.