https://doi.org/10.1140/epjd/e2005-00006-0
Gain properties in a four-level system with a closed interaction contour
1
College of physics, Jilin University, Changchun 130023, P.R. China
2
Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Educational Ministry of China, Changchun, P.R. China
3
CCAST (World Laboratory), P.O. Box 8370, Beijing 100080, P.R. China
Corresponding author: a jygao@mail.jlu.edu.cn
Received:
2
April
2004
Revised:
12
August
2004
Published online:
25
January
2005
We propose a novel scheme for light amplification and gain equalization by quantum interference. We find that the laser amplification can be observed at three specific probe frequencies in a four-level system. Furthermore, we show that three gain peaks can be combined into one to obtain gain equalization.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 42.50.Hz – Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
