在理论上研究了RY型四能级原子系统中的交叉Kerr非线性效应.采用微扰理论和密度矩阵方法导出三阶极化率实部随外加的相干耦合场强度和原子两基态间的无辐射衰减系数之间的关系.结果表明,在双光子Raman共振处,通过减小原子两基态间的无辐射衰减系数和提高外加的相干耦合场的强度,可以获得无吸收增强的交叉Kerr非线性效应.该研究结果在全光学开关上有着重要的应用潜力.
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