Zhang Zhaoyang, Ma Danmeng, Zhang Yiqi, Cao Mingtao, Xu Zhongfeng, Zhang Yanpeng
Opt Lett. 2017 Mar 15;42(6):1059-1062. doi: 10.1364/OL.42.001059.
We experimentally generate a vortex beam through a four-wave mixing (FWM) process after satisfying the phase-matching condition in a rubidium atomic vapor cell with a photonic band gap (PBG) structure. The observed FWM vortex can also be viewed as the reflected part of the launched probe vortex from the PBG. Further, we investigate the propagation behaviors, including the spatial shift and splitting of the probe and FWM vortices in the medium with enhanced Kerr nonlinearity induced by electromagnetically induced transparency. This Letter can be useful for better understanding and manipulating the applications involving the interactions between optical vortices and the medium.
我们在具有光子带隙（PBG）结构的铷原子蒸汽池中满足相位匹配条件后，通过四波混频（FWM）过程实验性地产生了一个涡旋光束。观察到的FWM涡旋也可以被视为从PBG反射的入射探测涡旋的一部分。此外，我们研究了在由电磁诱导透明引起的增强克尔非线性的介质中，探测涡旋和FWM涡旋的传播行为，包括空间位移和分裂。这封信对于更好地理解和操纵涉及光学涡旋与介质相互作用的应用可能是有用的。
