Open AccessAmplification without population inversion in tree-level system driven by an additional microwave field
Author(s) -
Yang Li-jun,
Teng Ma,
Kaihua Sun,
Feng Xiao-Min
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.064205
Subject(s) - population inversion , microwave , atomic system , inversion (geology) , population , lasing threshold , absorption spectroscopy , materials science , computational physics , molecular physics , atomic physics , optics , physics , optoelectronics , wavelength , laser , quantum mechanics , demography , sociology , paleontology , structural basin , biology
In this paper, we investigate the spectrum properties of the lasing without population inversion in a three-level atomic system under an action of an externally applied microwave field. The probed absorption spectrum is obtained by solving the density matrix equation of this system. The results show that the absorption profile has a multi-peak structure, and exhibits obviously negative absorption (light amplification) in a specific range under the action of strong microwave field. The characteristic of the light amplification without population inversion according to the three level atomic system is demonstrated by the quantitative analysis of populations related to the probe levels.