Manipulation of a ring-shaped beam via spatial self- and cross-phase modulation at lower intensity
Manipulation of a ring-shaped beam via spatial self- and cross-phase modulation at lower intensity
复制标题
通过空间自相位和交叉相位调制以较低强度操纵环形光束
DOI：
10.1039/c8cp06799f
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发表时间：
2019
影响因子：
3.3
通讯作者：
Zhang Yanpeng
中科院分区：
文献类型：
--
作者：
Cheng Lin;Zhang Zhaoyang;Zhang Lei;Ma Danmeng;Yang Gaoguo;Dong Tian;Zhang Yanpeng
We report a tunable ring-shaped diffraction pattern via either nonlinear spatial self- or cross-phase modulation caused by the EIT-like effect in rubidium atomic vapor. During the propagation of an input Gaussian-profile beam, its output wavefront exhibits a ring-shaped diffraction pattern. Furthermore, the spot center can be tuned from dark to bright by varying individual experimental parameters, such as power, frequency detuning, the polarization state of the incident beams and atomic temperature, which makes the nonlinear phase shift evolve beyond 2π. In particular, the input intensity can be as low as 500 W m−2.
