Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil.
Opt Lett. 2010 Dec 1;35(23):3937-9. doi: 10.1364/OL.35.003937.
We report on the simultaneous observation, by delayed Bragg diffraction, of four- and six-wave mixing processes in a coherently prepared atomic ensemble consisting of cold cesium atoms. For each diffracted order, we observe different temporal pulse shapes and dependencies with the intensities of the exciting fields, evidencing the different mechanisms involved in each process. The various observations are well described by a simplified analytical theory, which considers the atomic system as an ensemble of three-level atoms in Λ configuration.
我们报告了在由冷铯原子组成的相干制备原子系综中，通过延迟布拉格衍射对四波和六波混合过程的同时观察。对于每个衍射阶，我们观察到不同的时间脉冲形状和与激发场强度的依赖性，证明了每个过程中涉及的不同机制。各种观察结果都可以通过简化的分析理论很好地描述，该理论将原子系统视为 Λ 构型的三能级原子系综。
