文献类型：期刊文献

英文题名：Propagation properties of nonuniform cosine- Gaussian correlated Bessel-Gaussian beam through paraxial ABCD system and generation of dark-hollow beam array

作者：Zhu Jie Tang Hui-Qin Li Xiao-Li Liu Xiao-Qin

第一作者：朱洁

通信作者：Zhu, J[1]|[14440901970e7c97ae94b]朱洁;

机构：[1]Guizhou Inst Technol, Sch Sci, Guiyang 550003, Guizhou, Peoples R China;[2]Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China

第一机构：贵州理工学院理学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Sci, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院理学院;贵州理工学院;

年份：2017

卷号：66

期号：16

外文期刊名：ACTA PHYSICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000410789900013)】；

基金：Project supported by the High Level Introduction of Talent Research Start-up Fund of Guizhou Institute of Technology, China.

语种：英文

外文关键词：partially coherent beam; nonconventional correlation function; self; splitting; dark-hollow beam array

摘要：Partially coherent beams with nonconventional correlation functions have been extensively studied due to their wide and important applications in free-space optical communication, particle trapping, image transmission and optical encryption. Here, we study the propagation of nonuniform cosine-Gaussian correlated Bessel-Gaussian beam (cGBCB) in detail. Analytical expressions for the cross-spectral density function of cGBCBs through paraxial A B CD system are derived based on the extended Huygens-Fresnel integral. By use of the derived formulae, the intensity distribution properties of a nonuniform cGBCB on propagation in free space are analytically investigated. Some numerical calculation results are presented and discussed graphically. It is found that when the root-mean-square correlation width delta and the parameter controlling the degree of coherence profiles beta are appropriately chosen, the intensity distribution of the nonuniform cGBCB displays self-splitting properties during propagation. We point out that rather than a simple duplication, the self-splitting behaviour consists of a complex process in which the dark hollow pattern for cGBCB is gradually filled in the centre at first, then starts to split with increasing the propagation distance, and most impressively, an evolution process from a single dark hollow beam in the source plane to quadruple dark hollow profiles in certain propagation ranges can be realized. The influence of correlation function on the evolution properties of the intensity distribution is investigated, demonstrating that the values of parameters delta and beta of the correlation function play a critical role in inducing the self-splitting effect for nonuniform cGBCB on propagation in free space. Therefore, it is clearly shown that modulating the correlation function of a partially coherent beam can alter the coherence length and the degree of nonuniformity, and thus provides an effective way of manipulating its propagation properties. We also find the evolution speed of the intensity distribution can be greatly affected by the topological charge n of the beam function and the parameter R controlling the hollow size of cGBCB in source plane, e. g. the intensity distribution evolves into quadruple dark hollow profiles more slowly with larger n or smaller R. As is well known, the dark-hollow intensity configurations are useful in many applications and have been extensively studied both theoretically and experimentally. Therefore, the results drawn in the paper develop an alternative way to realize dark-hollow beam array, and further pave the way for dark hollow beam applications in long-distance free-space optical communications.