Diffractionless image propagation and frequency conversion via four-wave mixing exploiting the thermal motion of atoms
Diffractionless image propagation and frequency conversion via four-wave mixing exploiting the thermal motion of atoms
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DOI：
10.1103/physreva.89.013817
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发表时间：
2014-01-15
影响因子：
2.9
通讯作者：
Evers, Joerg
中科院分区：
文献类型：
--
作者：
Zhang, Lida;Evers, Joerg
提出了一种利用热原子蒸气中的四波混频将在探测场的空间轮廓中编码的任意图像频率变换到信号场的装置。利用原子运动同时抵消信号场和探测场的衍射。我们发现，非相干探测场可以用来增加横向动量带宽，这样就可以在没有绕射的情况下传播，从而可以传输具有更高空间分辨率的更小的结构。此外，它还用非线性增益补偿了线性吸收，从而改善了四波混频性能，因为各种场强的传播动力学都得到了有利的修改。
A setup to frequency-convert an arbitrary image encoded in the spatial profile of a probe field onto a signal field using four-wave mixing in a thermal atom vapor is proposed. The atomic motion is exploited to cancel diffraction of both signal and probe fields simultaneously. We show that an incoherent probe field can be used to enhance the transverse momentum bandwidth which can be propagated without diffraction, such that smaller structures with higher spatial resolution can be transmitted. It furthermore compensates linear absorption with nonlinear gain, to improve the four-wave mixing performance since the propagation dynamics of the various field intensities is favorably modified.