摘要
在一般Λ型三能级模型的基础上提出准Λ型四能级系统 ,并对准Λ型四能级模型的共振荧光谱作了详尽的研究 .从上能级向两边下能级辐射的自发辐射谱中产生了三个超窄谱线 ,且在很大参数范围内光谱具有这一特性 .三个超窄谱线的产生是和两个相干驱动场的Rabi频率密切相关 ,在较大的Rabi频率作用下谱线会变得更窄 ,而当只有一个驱动场作用时是不会产生谱线变窄效应的 .能级间的碰撞弛豫和非相干激发严重地破坏了谱线变窄 .
We present a new Quasi Λ model four level system based on a general three level Λ model and investigate the resonant fluorescence spectroscopy in detail. There are three ultra narrow spectral lines in the spontaneous emission spectra from upper level to lower lying levels of the two emission channels, which occur over a wide range of the parameters. The appearance of the three ultra narrow spectral lines is closely related with Rabi frequency of the two coherence driving fields; and the larger the Rabi frequency, the narrower the lines. The effect of line narrowing does n't occur when there is only a coherence driving field. While the incoherent transition and the collisional decay between the energy levels destroy the feature of the spectral narrowing which may be considered to be the result of the multi channel quantum interference.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第1期36-41,共6页
Acta Physica Sinica
