Open AccessPhase and amplitude-dependent inversionless gain controlled by a three-level closed loop system
Author(s) -
Zhiying Zhang,
Shencheng Fu,
Lijun Gou,
Zheng Yao
Publication year - 2013
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.62.104206
Subject(s) - physics , closed loop , amplitude , population inversion , loop (graph theory) , relative phase , control theory (sociology) , phase (matter) , interference (communication) , optics , laser , quantum mechanics , computer science , telecommunications , control (management) , channel (broadcasting) , mathematics , combinatorics , control engineering , artificial intelligence , engineering
We study a four-level atomic system controlled by a three-level closed loop subsystem in order to obtain the phase-sensitive probe gain without population inversion. In the case of three-photon resonance, a large steady-state inversionless probe gain can be obtained. Due to the quantum interference effect, the inversionless gain is sensitive to the relative phase of the three-level closed loop subsystem. Further, the field intensity of the three-level closed loop subsystem is also an important parameter that can affect gain characteristic of the probe field.