Bichromatic and trichromatic manipulation of spontaneous emission in a three-level Λ system
Bichromatic and trichromatic manipulation of spontaneous emission in a three-level Λ system
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DOI：
10.1016/j.optcom.2005.10.014
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发表时间：
2006-04
影响因子：
2.4
通讯作者：
Xiangming Hu;Qing Xu;Jing-yan Li;Xiao-xia Li;Wen-xing Shi;Xiu Zhang
中科院分区：
文献类型：
--
作者：
Xiangming Hu;Qing Xu;Jing-yan Li;Xiao-xia Li;Wen-xing Shi;Xiu Zhang
利用密度矩阵方程和量子回归定理，研究了Λ组态三能级系统自发辐射的双色和三色操控。采用谐波展开和矩阵求逆的方法对自发辐射谱进行了数值计算。显示了两个典型特征。首先，对于双色或三色激发，恢复在单色激发的情况下不存在的中心共振峰。其次，通过改变三色分量的振幅和相位，实现了谱线的选择性消除。对于相位依赖性，起决定性作用的是两个边带分量与中心分量的相对相位之和。一旦和相位改变，自发辐射谱就急剧改变，但是当和相位固定时，不管各个相位如何，自发辐射谱都保持不变。
Bichromatic and trichromatic manipulation of spontaneous emission in a three-level system in Λ configuration is studied on the basis of density matrix equation and quantum regression theorem. The spontaneous emission spectrum is numerically calculated by using harmonic expansion and matrix inversion. Two characteristic features are shown. Firstly, the central resonance peak, which is absent in the case of monochromatic excitation, is recovered for the bichromatic or trichromatic excitation. Secondly, selective elimination of the spectral lines is obtained by varying the amplitudes and phases of the trichromatic components. For the phase dependence, it is the sum of the relative phases of the two sideband components to the central component that plays a crucial role. The spontaneous emission spectrum is drastically modified once the sum phase is changed, but is kept unchanged regardless of the respective phases when the sum phase is fixed.