Parametric amplification in an electromagnetically-induced-transparency medium
Parametric amplification in an electromagnetically-induced-transparency medium
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DOI：
10.1103/physreva.78.013809
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发表时间：
2008-07-01
影响因子：
2.9
通讯作者：
Mitsunaga, Masaharu
中科院分区：
文献类型：
--
作者：
Harada, Ken-ichi;Mori, Kenji;Mitsunaga, Masaharu
在一个使用热钠蒸气的普通电磁感应透明(EIT)实验中，我们观察到在完全不透明(透过率类似于10(-5))的情况下，在耦合光束存在的情况下，探测增益高达32，透过率增加了6个数量级。这种增益归因于伴随着具有相似输出强度的斯托克斯(或反斯托克斯)波的参量放大(PA)，并且严重依赖于原子密度和耦合光束功率。实验和理论分析表明，虽然EIT图在相对较低的原子密度下是有效的，但在高原子密度和高耦合功率时，PA图成为主导。我们还发现，由于两个基本过程的相消干涉，适当选择耦合失谐频率可以使探测波和斯托克斯波之间的参数耦合失效。
In an ordinary electromagnetically-induced-transparency (EIT) experiment using a hot sodium vapor, we have observed a probe gain up to 32 in the presence of a coupling beam in an otherwise totally opaque (transmissivity similar to 10(-5)) situation, increasing the transmissivity by 6 orders of magnitude. This gain is attributable to parametric amplification (PA), accompanying the Stokes (or anti-Stokes) wave with similar output intensity, and is critically dependent upon the atomic density and the coupling beam power. Experimental and theoretical analyses have revealed that, while the EIT picture is valid for relatively low atomic densities, the PA picture becomes dominant for high atomic densities and high coupling powers. We have also found that the parametric coupling between the probe and Stokes waves can be nullified by the proper choice of the coupling detuning frequency, due to destructive interference of two elementary processes.