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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Mechanisms in laser without inversion

E. Arimondo

Published Oct 28, 1992• 8 citations
Publisher

Abstract

The schemes of laser without inversion depend on the mechanisms involved in the generation of coherence. Three-level schemes between discrete states in the (Lambda) -configuration, and the role played by the coherent population trapping phenomenon, are discussed.
DOI
10.1117/12.130472

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This review paper is devoted to amplification and lasing without population inversion involving atomic transitions in gas media. We start by discussing the main motivation in inversionless lasing research, namely, the generation of short-wavelength laser light. Then, we review the basic physics of inversionless lasing in two-level and, eventually, in three- and multilevel atomic configurations. Finally, we summarize the current state of the art of LWI experiments and indicate the main difficulties with respect to short-wavelength laser generation.
In the case of incoherent pumping, laser without population inversion in a resonant three-level Δ -configuration system is investigated. By taking the strong coupling field limit, we obtain the approximate steady-state analytical solution of populations and imaginary part of coherences within the dressed-state regime, and discuss the condition of the generating of laser without inversion and the dependences of population distribution and system gain on Rabi frequency of the probe and coherence fields. The results show that the resonant three-level Δ-configuration system is always in the state of no population inversion, and laser without inversion occurs if one of the two fields is strong. When one of the two fields is much stronger than the other one, the gain without inversion is independent of the two Rabi frequencies.