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

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

Radiation amplification without population inversion: a four level model

Junyuan Gao, Cunlan Guo, Xiaohui Guo, Guang Xu Jin, Q. W. Wang, Jiang‐Lin Zhao, H. Z. Zhang, Yun Jiang, Dong Wang, D. M. Jiang

Published Oct 28, 1992• 0 citations
Publisher

Abstract

We report experimental results of radiation amplification without population inversion in sodium according to a four-level model.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
DOI
10.1117/12.130480

Related papers

Experimental Evidence of Radiation Amplification Without Population Inversion in Sodium Atoms

Gao Jinyue, Guo Chuan, Jin Guangxu +7 more

We have demonstrated a radiation amplification without population inversion in sodium according to a four-level model, which was recently proposed by Norducci et al. The amplified radiation signal at 589.0 nm has been observed when an intense coherent driving field at 589.6 nm was on and an incoherent pumping process from the ground state 3 S 1/2 to 3 P 3/2 excited state was operating.

Chinese Physics Letters•Nov 1, 1992•0 citations

Induced gamma-emission in inversionless schemes with radio frequency field

E. A. Popov, V. I. Kouznetsov, V. P. Bugrov

The two possible schemes of inversionless amplification of resonant (gamma) -radiation with radiofrequency pumping have been analyzed by making use of the effective model of nuclear states.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jan 14, 2000•1 citation

Radiation amplification through autoionizing resonances without population inversion

A. Lyras, Xian Tang, P. Lambropoulos +1 more

We present a quantitative study of radiation amplification without population inversion based on models recently proposed by Harris [Phys. Rev. Lett. 62, 1033 (1989)]. We discuss both two-level and three-level arrangements in terms of the density matrix. Our calculations, which are fully time dependent, incorporate an incoherent pumping mechanism that is essential for amplification. We discuss in detail the range of and conditions on atomic parameters for which amplification is possible. Its feasibility is demonstrated through the direct calculation of the change of the intensity of a probe beam interacting with the atom.

Physical Review A•Oct 1, 1989•123 citations

Amplification without population inversion

Olga A. Kocharovskaya, Paul Mandel, Yakov I. Khanin

Three- and four-level schemes of inversionless amplification with different types of coherent pumping is reviewed. Amplification without inversion between the 'bare' states is a result of population inversion between eigenstates of the density matrix. In particular, it can be achieved due to the coherent population trapping, i.e., effective removal from the interaction with the field a fraction of atoms at lower levels.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 16, 1992•2 citations

Observation of light amplification in sodium driven by a coherent field

Jin-Yue Gao, Hanzhuang Zhang, Xiuzhen Guo +5 more

There has been much interest in lasing without inversion in three- and four-level systems.1-4

Annual Meeting Optical Society of America•Jan 1, 1993•0 citations

Atomic coherence effects within the sodium D1manifold. III. Lasing without inversion via population trapping

Gunasiri G. Padmabandu, Xingfu Li, Chang Su +5 more

Transient lasing without inversion has been experimentally demonstrated in sodium vapour. The principle of this atomic coherence effect can be well understood from the theory of a simple four-level system. The experimental results match with numerical simulations which take the complete hyperfine structure of the sodium D 1 line into account. The differences between our system and a Raman laser are discussed.

Quantum Optics Journal of the European Optical Society Part B•Aug 1, 1994•8 citations
We present a quantitative study of radiation amplification without population inversion based on models recently proposed by Harris [Phys. Rev. Lett. 62, 1033 (1989)]. We discuss both two-level and three-level arrangements in terms of the density matrix. Our calculations, which are fully time dependent, incorporate an incoherent pumping mechanism that is essential for amplification. We discuss in detail the range of and conditions on atomic parameters for which amplification is possible. Its feasibility is demonstrated through the direct calculation of the change of the intensity of a probe beam interacting with the atom.