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Zeitschrift für Physik D Atoms Molecules and Clusters

Effect of finite bandwidths of probe and driving fields on refractive index and gain in a Raman-driven four-level system

Hanzhuang Zhang, Jin-Yue Gao

Published Mar 1, 1996• 3 citations
Publisher
DOI
10.1007/s004600050055

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In this paper the effects of the transverse profile of the probe and driving fields on the gain in a Raman-driven four-level system are discussed. The results show that when transverse effects are included, the probe gain spectrum has a different structure compared with that in the plane-wave approximation, the optimum focal position of a focus lens for the maximum gain is not at the center of the sample cell, and the gain is very sensitive to the changes of focal position when the waist of the driving field is small.
We have studied the effect of finite bandwidth of the driving field on the enhancement of refractive index and lasing without inversion in a three-level atomic system in which partial coherence is introduced either in upper-level or lower-level doublet via a strong microwave driving field having finite bandwidth. We find that both phenomena are adversely affected by the phase fluctuations in the driving field. Further, there is a range of driving field detuning for which the refractive index is considerably enhanced with vanishing absorption.
A steady analytical solution of an open four-level inversionless lasing system with a driving field having the phase fluctuation has been given, and the effects of the finite width due to the phase fluctuation on the gain, dispersion, and population difference have been analyzed by using the numerical simulation from the steady analytical solution. It is found that: with the linewidth increasing, the gain decreases and the absolute value of population difference between levels coupled by the probe field increases, but the variation of the linewidth cannot change the properties of the inversionless lasing and refractive index increase of the system; when the linewidth does not equal to zero, the system can still get a high refractive index with zero absorption, and these conclusions have very obvious difference from those obtained in other inversionless lasing systems.