%0 Journal Article
%T NON-DEGENERATE TWO-PHOTON FLUORESCENCE SPECTRUM FOR TWO-LEVEL ATOM IN SQUEEZED VACUUM<br>压缩真空库场中二能级原子的非简并双光子荧光谱
%A HE LIN-SHENG
%A FENG XUN-LI
%A WU SHI-XIONG
%A ZHANG ZHI-MING
%A XIA YU-XING
%A <br>何林生
%A 冯勋立
%A 吴世雄
%A 张智明
%A 夏宇兴
%J 物理学报
%D 1998
%I 
%X 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.
%K 压缩真空场
%K 二能级原子
%K 非简交
%K 双光子
%K 荧光谱
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=CE7EBDE17DD089B75F378CA05232BC68&yid=8CAA3A429E3EA654&vid=F4B561950EE1D31A&iid=0B39A22176CE99FB&sid=D5C73DEF4CF8FAF3&eid=FA89360EB995A8AD&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=4