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首页> 外文期刊>Optical and quantum electronics >Optical transparency and nonlinearity for a five-level tripod system involving a Rydberg state
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Optical transparency and nonlinearity for a five-level tripod system involving a Rydberg state

机译：涉及Rydberg状态的五级三脚架系统的光学透明度和非线性

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摘要

We demonstrate electromagnetically-induced transparency and giant Kerr nonlinearity in a five-level atomic system where the upper level is a Rydberg-state coupled coherently to a four-level tripod subsystem. Since the high Rydberg states exhibit rather long lifetimes, the system evolves into a dark state that is a superposition of all long-lived states resulting in an optical transparency for the probe field. We solve the relevant density matrix equations for the atomic system in steady-state and utilize the perturbation approach to obtain the expressions for the linear and nonlinear susceptibility. It is shown that depending on the system parameters, the system can exhibit triple, double or single, optical transparency. Therefore, there is a resulting change in the sign of linear dispersion for different parametric situations giving, rise to switching in the group velocity of the probe pulse from super-luminal to subluminal or vice versa. We also identify the existence of giant third-order Kerr nonlinearities within regions of optical transparency and under the slow light condition.
机译：我们在五级原子系统中展示了电磁诱导的透明度和巨大的kerr非线性，其中上层是rydberg-state耦合到四级三脚架子系统。由于高雷德伯格状态表现出相当长的寿命，因此系统演化为暗状态，这是所有长期状态的叠加，导致探针场的光学透明度。我们解决了稳态系统的相关密度矩阵方程，利用扰动方法来获得线性和非线性易感性的表达。结果表明，根据系统参数，系统可以表现出三倍，双或单，光学透明度。因此，对于不同参数化情况的线性色散的符号存在导出的变化，从而升高到从超级腔探测脉冲的群体速度从超级管道到副管道转换，反之亦然。我们还确定了在光学透明度区域内的巨型三阶Kerr非线性存在的存在性，并且在缓慢的光线条件下。

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