Amplitude and phase control of trichromatic electromagnetically induced transparency
Amplitude and phase control of trichromatic electromagnetically induced transparency
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DOI：
10.1088/0953-4075/38/6/007
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
Xiangming Hu;J. Zou;Xing Li;D. Du;Guang-ling Cheng
中科院分区：
文献类型：
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作者：
Xiangming Hu;J. Zou;Xing Li;D. Du;Guang-ling Cheng
我们研究了多个电磁感应透明体中吸收和色散光谱对驱动场的振幅和相位的依赖性。为此，我们考虑三能级Λ原子系统中的三色激发，其中三色控制激光和单色探测激光分别应用于两个不同的跃迁。我们对吸收光谱和色散光谱进行了数值计算。发现了两个特征。首先，利用驱动元件的振幅和相位可以使中心透明体出现或消失。其次，只要我们将两个边带激发分量的两个相对相位之和固定为中心分量，无论我们如何改变各自的相对相位，吸收光谱和色散光谱都保持其自身的线形不变。
We study the dependence of absorption and dispersion spectra on amplitudes and phases of the driving fields in multiple electromagnetically induced transparency. For this purpose we consider trichromatic excitation in a three-level Λ atomic system, in which a trichromatic control laser and a monochromatic probe laser are applied to two different transitions, respectively. We numerically calculate the absorption and dispersion spectra. Two characteristic features are found. Firstly, the central transparency can be made to appear or to disappear by utilizing the amplitudes and phases of the driving components. Secondly, so long as we fix the sum of two relative phases of two sideband excitation components to the central component, the absorption and dispersion spectra keep their own lineshapes unchanged no matter how we vary the respective relative phases.