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Physical Review A

Comment on ‘‘Lasing without inversion in a V system due to trapping of modified atomic states’’

Yifu Zhu, Min Xiao

Published Mar 1, 1994• 9 citations
Publisher

Abstract

We point out a mistake in a recent paper [Tan, Lu, and Harrison, Phys. Rev. A 46, R3613 (1992)] and show that, contrary to the authors' claim, lasing without inversion is impossible in a closed V system driven by a single coherent field only.
DOI
10.1103/physreva.49.2203

Related papers

Reply to ‘‘Comment on ‘Lasing without inversion in a V system due to trapping of modified atomic states’ ’’

Weihan Tan, Weiping Lu, Robert G. Harrison

Accounting for the mistake in our earlier analysis [Phys. Rev. A 46, R3613 (1992)] that was pointed out by Zhu and Xiao [recent Comment, Phys. Rev. A 49, 2203 (1994)] we show that lasing without inversion is still achieved in our more general model description of a ssV-shaped system.

Physical Review A•Apr 1, 1994•1 citation

Lasing without inversion in a V system due to trapping of modified atomic states

Weihan Tan, Weiping Lu, Robert G. Harrison

We analyze lasing without inversion in a V system driven by a single optical field. This is shown to depend on the relaxation rates and photon degeneracy parameters of the system and occurs for a broad range of lasing intensities. The physical mechanism is explained in terms of trapping of the modified ground state, which is coherently split by the optical pump field.

Physical Review A•Oct 1, 1992•17 citations

Comment on ‘‘Theory of lasers without inversion’’

Shi-Yao Zhu, James D. Cresser, H. Fearn

We prove that lasing without inversion is impossible in the three-level system with two active upper levels that are mixed by applied low-frequency electromagnetic radiation. Such lasing was recently proposed by Blok and Krochik [Phys. Rev. A 41, 1517 (1990)].

Physical Review A•May 1, 1991•2 citations

Lasing without inversion in a closed three-level system

Yifu Zhu

It is shown that a closed V-type, three-level system, which is incoherently pumped on the transition at which lasing occurs and coherently pumped on the other transition, exhibits lasing without population inversion in any atomic state basis. The same system can be also made to exhibit lasing without population inversion in the bare atomic state basis but with population inversion in the dressed-state basis.

Physical Review A•May 1, 1992•126 citations

EXTERNAL-FIELD-INDUCED COHERENCE AND LASING WITHOUT INVERSION: THE V-TYPE SYSTEM

Zhenfei Luo, Zhizhan Xu, 中国科学院上海光学精密机械研究所,上海201800

The conditions for realizing lasing without inversion are investigated via density matrix method in bare and dressed states in the V-type closed lifetime-broadened system where atomic coherence is induced by an external electromagnetic field. It is shown that a proper choice of pumping rate may lead to the realization of lasing without inversion.

Acta Physica Sinica•Jan 1, 1993•0 citations

Lasing with and without inversion due to spontaneously generated coherence in an open V-type system

LI Jing-juan, Chengpu Liu, Cui Ni +2 more

It is shown that in an open V-type atomic system without incoherent pumping, the spontaneously generated coherence (SGC) can not only lead to lasing with inversion but also lead to lasing without inversion (LWI) including at resonance of the driving and probe fields. This conclusion is much different from that obtained in the corresponding closed V-type system.

Chinese Optics Letters•Dec 10, 2004•17 citations