Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Springer eBooks

Lasing Without Inversion Due to Initial Coherence between Lower Atomic States

Shi-Yao Zhu, Marlan O. Scully, Ernst E. Fill

Published Jan 1, 1989• 2 citations
Publisher
DOI
10.1007/978-1-4613-0847-8_232

Related papers

Lasing without inversion in a maser with injected atomic coherence

Ning Lu

Physics Letters A•Feb 1, 1990•11 citations

Two-mode lasing without inversion with injected atomic coherence

Pál Bogár, János A. Bergou

Noninversion lasing is investigated in \ensuremath{\Lambda}-type three-level atomic systems that are coupled to two modes of the electromagnetic field. As a result of an external field driving the transition between the lower two closely spaced levels, laser action can be achieved in both modes simultaneously at arbitrarily small initial upper-level population (lasing without inversion) provided the pumping rate exceeds a certain threshold. The relative phase of the two modes is locked to a particular value controlled by the phase of the external field. In addition, new regimes of the laser operation arise when initial coherences between various atomic levels are also injected into the resonator. Firstly, laser action can be achieved in both modes at arbitrarily small pumping (no threshold). Secondly, the injected atomic coherence can control competition between the modes, and result in a variety of multistable steady-state behavior illustrating the very sensitive dynamics of the system.

Physical Review A•Jul 1, 1997•8 citations

Lasing in a two-level atomic system without population inversion

Л. С. Гайда, Iosif S. Zeilikovich, S. A. Pulkin +1 more

Optics and Spectroscopy•Oct 1, 1988•0 citations

Coherence-induced lasing in simple atomic systems

Yifu Zhu

Quantum Electronics and Laser Science Conference•May 22, 1995•0 citations

Realization of lasing without inversion in the system with lower-level coherence

Zhenfei Luo, Zhizhan Xu

It is shown that the ladder system with lower-level coherence may be used to obtain lasing without inversion. The present model system has several important features. (1) No requirement is placed on atomic decay rates. (2) The Rabi frequency of coherence-driving field must exceed a lower threshold. (3) An unidirectional pumping is indispensable. (4) A dressed-state-coherence origin of gain is proved without strong coherence-driving field approximation.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 10, 1993•0 citations

Role of atomic coherence in lasing without inversion

Zhenfei Luo, Zhizhan Xu

A noninversion laser system which is closed lifetime broadened and free of the restriction on atomic decay rates is proposed. For the realization of lasing without inversion, the Rabi frequency of the applied field must exceed a lower threshold. Moreover, the coherence term in dressed states must enhance the gain. These results are obtained beyond the specific approximations.

Physical Review A•Feb 1, 1993•4 citations
Noninversion lasing is investigated in \ensuremath{\Lambda}-type three-level atomic systems that are coupled to two modes of the electromagnetic field. As a result of an external field driving the transition between the lower two closely spaced levels, laser action can be achieved in both modes simultaneously at arbitrarily small initial upper-level population (lasing without inversion) provided the pumping rate exceeds a certain threshold. The relative phase of the two modes is locked to a particular value controlled by the phase of the external field. In addition, new regimes of the laser operation arise when initial coherences between various atomic levels are also injected into the resonator. Firstly, laser action can be achieved in both modes at arbitrarily small pumping (no threshold). Secondly, the injected atomic coherence can control competition between the modes, and result in a variety of multistable steady-state behavior illustrating the very sensitive dynamics of the system.