Polarization interference in six-wave mixing in a Doppler-broadened N-type four-level system
Polarization interference in six-wave mixing in a Doppler-broadened N-type four-level system
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DOI：
10.1364/josab.26.002268
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发表时间：
2009-12
影响因子：
1.9
通讯作者：
Jinyan Niu;Ru-quan Wang;Ling-An Wu;P. Fu
中科院分区：
文献类型：
--
作者：
Jinyan Niu;Ru-quan Wang;Ling-An Wu;P. Fu
在非线性原子气体介质中，原子速度分布内不同系综的独立宏观极化之间的干涉会导致多波混频光谱的异常行为。对于多普勒加宽n型四能级系统中的相位共轭六波混频（SWM），发现SWM频谱可以是无多普勒的，也可以是非常宽的，这取决于入射光束的方向和波矢量幅度之间的比值。这种极化干扰可以通过强耦合场来控制，另一方面，当SWM频谱为无多普勒时，可以诱导奥特勒-汤斯（Autler-Townes， AT）分裂。这种技术可能会有特殊的应用，作为一种改进的AT光谱，具有更高的分辨率。
In nonlinear atomic gaseous media the interference between independent macroscopic polarizations of different ensembles within the atomic velocity distribution can lead to anomalous behavior of the multiwave mixing spectra. For phase-conjugate six-wave mixing (SWM) in a Doppler-broadened N-type four-level system, it is found that the SWM spectrum can be either Doppler-free or very broad, depending on the directions of the incident beams and the ratios between the magnitudes of the wave vectors. This polarization interference can be controlled by the strong coupling field which, on the other hand, can induce Autler-Townes (AT) splitting when the SWM spectrum is Doppler-free. This technique may find special applications as an improved form of AT spectroscopy with higher resolution.