Open AccessInfluence of the field with varying frequency modulation on atomic population inversion in non-ratating-wave approximation
Author(s) -
Liao Xu,
Cong Hong-Lu,
Jiang Dao-Lai,
Xuezao Ren
Publication year - 2010
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.59.5508
Subject(s) - population inversion , population , physics , amplitude , orthogonalization , photon , inversion (geology) , computational physics , oscillation (cell signaling) , atomic physics , quantum mechanics , quantum electrodynamics , mathematics , geology , chemistry , laser , paleontology , biochemistry , demography , algorithm , structural basin , sociology
By the method of coherent-state orthogonalization expansion, the evolution of atomic population inversion is investigated in the non-rotating-wave approximation. The numerical results indicate that, when field frequency and coupling do not change with time, the collapse-revival period of population inversion increases with the mean photon number of the field increasing, and the quick oscillation due to virtual photon process increases with couplings strengthening. When the frequency changes with time in the sine form, amplitude α and angle frequency β of the field both have a great influence on atomic population inversion. The sudden jumping of the field frequency can lead to some new collapses and rebibals in the evolution of atomic population inversion. Both of the field frequency forms can have an influence on quick oscillation due to virtual photon process.