Open AccessNON-DEGENERATE TWO-PHOTON FLUORESCENCE SPECTRUM FOR TWO-LEVEL ATOM IN SQUEEZED VACUUM
Author(s) -
HE LIN-SHENG,
Feng Xun-Li,
WU SHI-XIONG,
ZhiMing Zhang,
XIA YU-XING
Publication year - 1998
Publication title -
acta physica sinica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.219
Subject(s) - physics , degenerate energy levels , laser linewidth , photon , oscillation (cell signaling) , fluorescence , spectrum (functional analysis) , atom (system on chip) , atomic physics , resonance fluorescence , master equation , spectral line , operator (biology) , quantum mechanics , quantum , chemistry , laser , computer science , embedded system , biochemistry , repressor , transcription factor , gene
In this paper the master equation is derived for the atomic reduced density operator, by means of projection operator technique, starting from the Liouville equation. The nondegenerate two-photon fluorescence spectrum for an atom with two-levels in a squeezed vacuum with broad band has been studied by means of the above equation. We find that there is a new type of oscillation phenomenon, in which there are both super and lower thresholds. Between the two thresholds the atom will exhibit oscillation and the two-photon fluorescence spectrum exhibits single peak. Outside the region between the two thresholds the oscillation will not happen and the two-photon fluorescence spectrum possesses novel negative peak or peaks. The shapes of the spectra depend strongly on the natural two-photon linewidth. However, the spectra are not phase-sensitive, which is unexpected.
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