Open AccessATOMIC COHERENCE INDUCED BY TWO-PHOTON PROCESS——TRANSITION FROM LASING WITH INVERSION TO LASING WITHOUT INVERSION
Author(s) -
Xiangming Hu,
Dexin Wang
Publication year - 1997
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.46.61
Subject(s) - lasing threshold , inversion (geology) , coherence (philosophical gambling strategy) , population inversion , materials science , gain switching , optical pumping , laser , atomic physics , optoelectronics , physics , optics , quantum mechanics , paleontology , structural basin , biology
In this paper, the pumping mechanism in the closed Ξ-type three-level system can be simplified using the coherence induced by the two-photon process. The system exhibits either lasing with inversion or lasing without inversion so long as there exists the pumping field. The system exhibits the transition from lasing with inverson to lasing without inversion under certain conditions. Near the transition lasing without inversion may be as efficient as lasing with inversion.