Transition from Autler–Townes splitting to electromagnetically induced transparency based on the dynamics of decaying dressed states
Transition from Autler–Townes splitting to electromagnetically induced transparency based on the dynamics of decaying dressed states
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DOI：
10.1088/0953-4075/48/5/055003
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Xiaogang Lu;Xing-Xu Miao;Jin-Hai Bai;Liya Pei;Meng Wang;Yan-Xiang Gao;Ling-An Wu;P. Fu;Ru-quan Wang;Z. Zuo
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文献类型：
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作者：
Xiaogang Lu;Xing-Xu Miao;Jin-Hai Bai;Liya Pei;Meng Wang;Yan-Xiang Gao;Ling-An Wu;P. Fu;Ru-quan Wang;Z. Zuo
通过观察由有效哈密顿量导出的衰减衣态动力学，研究了奥特勒-汤斯分裂（ATS）和电致透明（EIT）之间转变的阈值。发现阈值对应于耦合场变弱时弛豫对种群拉比振荡的抑制。此外，ATS和EIT属于两个不同的状态，前者处于非摄动状态，在非摄动状态下，耦合场耦合的态的居群存在相干的Rabi振荡。相比之下，EIT处于摄动状态，EIT共振的透明窗口可以解释为由于四波混频过程的增益。在冷铷原子中进行了实验，测量了吸收和色散，结果表明，通过光谱的傅里叶变换可以区分出EIT和ATS。与Anisimov et al . (2011；Rev. Lett. 107 163604)，我们的方法更直接，而且是确定的。
The threshold for the transition between Autler–Townes splitting (ATS) and electromagnetically induced transparency (EIT) is studied through examining the dynamics of decaying dressed states, which are derived from the effective Hamiltonian. It is found that the threshold corresponds to the suppression of the Rabi oscillation of the populations by the relaxation as the coupling field becomes weak. Moreover, ATS and EIT belong to two different regimes, the former being in the non-perturbation regime, where there is coherent Rabi oscillation of the populations of the states coupled by the coupling field. By contrast, EIT is in the perturbation regime, and the transparency window in the EIT resonance can be explained as being due to the gain of the four-wave mixing process. Experiments are performed in cold rubidium atoms, where both the absorption and dispersion are measured, showing that EIT can be discriminated from ATS through Fourier transformation of the spectra. Compared to the statistical method proposed by Anisimov et al (2011 Phys. Rev. Lett. 107 163604), our method is more direct and is deterministic.