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Physical Review A

Lasing without population inversion in a simple three-level atomic system

Shangqing Gong, Huaguo Teng, Zhizhan Xu

Published Apr 1, 1995• 21 citations
Publisher

Abstract

The steady-state gain for a simple three-level atomic system has been analyzed. It is shown that lasing without population inversion between the lower excited state and the ground state can be established over a wide frequency range for probe field and driving field. With the same atomic system, a large refractive index with zero absorption can also be generated.

DOI
10.1103/physreva.51.3382

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Physical Review Letters•Mar 8, 1993•113 citations
The steady-state gain for a simple three-level atomic system has been analyzed. It is shown that lasing without population inversion between the lower excited state and the ground state can be established over a wide frequency range for probe field and driving field. With the same atomic system, a large refractive index with zero absorption can also be generated.
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.