CAJ | 학술논문

提出了利用四能级原子系统与三个电磁场相互作用获取有效交叉Kerr非线性的方案.应用微扰理论和密度矩阵方法,得到了三阶极化率与外加电磁场失谐量的变化关系.结果表明：当两个弱探测场的失谐量达到拉曼共振时,可以获得一个大的交叉Kerr非线性磁化率,且自Kerr非线性极化率和线性极化率为零.证明了在具有拉曼共振的四能级原子系统中获得无吸收有效交叉Kerr非线性的可行性.
제출료이용사능급원자계통여삼개전자장상호작용획취유효교차Kerr비선성적방안.응용미우이론화밀도구진방법,득도료삼계겁화솔여외가전자장실해량적변화관계.결과표명：당량개약탐측장적실해량체도랍만공진시,가이획득일개대적교차Kerr비선성자화솔,차자Kerr비선성겁화솔화선성겁화솔위령.증명료재구유랍만공진적사능급원자계통중획득무흡수유효교차Kerr비선성적가행성.
A theoretical investigation is put forward for obtaining effective cross-Kerr nonlinearity of the four-level atom interacting with three electromagnetic fields.Using density-matrix equations and perturbation iterative method,the variation dependence of the third-order susceptibility on the detunings of the applied electromagnetic fields is derived.The results show that a large cross-Kerr nonlinearity can be generated when the detunings of the two weak probe fields are Raman resonant,and the corresponding linear susceptibility and self-Kerr interactions vanish.The realization of the effective Kerr nonlinearity with vanishing absorption is possible in a Raman resonant four-level system.