滤波Talbot透镜：用具有周期$λ$的驻波场产生$λ/2n$ -周期原子图案
Filtered Talbot lens: Producing $λ/2n$-periodic atomic patterns with standing wave fields having period $λ$
摘要：
我们提出了一个方案，以创建高对比度，周期性的原子密度分布周期$λ/2n$使用塔尔博特效应，其中$% λ$是光场的波长散射的原子和$n$是一个正整数。该{ \em滤波Talbot透镜}由两个驻波光场组成。原子束垂直于磁场传播。第一个场与原子跃迁频率有很大的失谐，它就像一个透镜阵列，聚焦原子。第二个场位于第一个场的原子光学焦点处，与原子跃迁频率共振，并充当振幅掩模，只留下通过其节点的那些原子不受干扰。在与第二场相互作用之后的等于泰伯长度的整数分之一的距离处，形成具有周期$λ/2n$的原子密度光栅。
英文摘要：
We propose a scheme to create high-contrast, periodic atom density distributions having period $λ/2n$ using the Talbot effect, where $% λ$ is the wave length of the optical fields that scatter the atoms and $n$ is a positive integer. This {\em filtered Talbot lens} is comprised of two standing-wave optical fields. An atomic beam propagates perpendicular to the fields. The first field, which is far-detuned from the atomic transition frequency, acts as an array of lenses that focuses the atoms. The second field, positioned at the atom optical focus of the first, is resonant with the atomic transition frequency and acts as an amplitude mask, leaving unperturbed only those atoms that pass through its nodes. At distances following the interaction with the second field that are equal to an integral fraction of the Talbot length, atomic density gratings having period $λ/2n$ are formed.
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