| 压缩真空库场中二能级原子的非简并双光子荧光谱 |
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| 引用本文： | 何林生,冯勋立,吴世雄,张智明,夏宇兴.压缩真空库场中二能级原子的非简并双光子荧光谱[J].物理学报,1998,47(2):219-231. |
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| 作者姓名： | 何林生 冯勋立 吴世雄 张智明 夏宇兴 |
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| 作者单位： | (1)合肥工业大学激光研究所，合肥 230009; (2)上海交通大学应用物理系，上海 200030; (3)西安交通大学应用物理系，西安 710049; (4)中国科学院安徽光学精密机械研究所激光光谱学开放研究实验室，合肥 230031 |
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| 摘 要： | 利用投影算符技巧从刘维方程出发导出了二能级原子约化密度算符主方程，研究了压缩真空库场中二能级原子的非简并双光子荧光谱特性.发现与真空库或热库中双光子荧光不同，在非简并双光子情况中存在一种新型振荡现象，它具有上下两个阈值，在上下阈值之间原子发生振荡，在两阈值之外原子将不发生振荡.在两阈值之间原子的非简并双光子荧光谱呈现正峰结构，在两阈值之外双光子荧光谱具有负的峰结构.光谱形状强烈地依赖于双光子自然线宽，但光谱是非相敏性的，这是未曾预料到的.
关键词：
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| 关 键 词： | 压缩真空场 二能级原子 非简交 双光子 荧光谱 |
| 收稿时间： | 1997-06-24 |
NON-DEGENERATE TWO-PHOTON FLUORESCENCE SPECTRUM FOR TWO-LEVEL ATOM IN SQUEEZED VACUUM |
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| HE LIN-SHENG,FENG XUN-LI,WU SHI-XIONG,ZHANG ZHI-MING and XIA YU-XING.NON-DEGENERATE TWO-PHOTON FLUORESCENCE SPECTRUM FOR TWO-LEVEL ATOM IN SQUEEZED VACUUM[J].Acta Physica Sinica,1998,47(2):219-231. |
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| Authors: | HE LIN-SHENG FENG XUN-LI WU SHI-XIONG ZHANG ZHI-MING and XIA YU-XING |
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| Abstract: | 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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