摘要
基于瑞利-索末菲衍射积分理论,利用交叉谱密度函数推导出双半高斯空心光束在湍流大气中传输时的解析表达式,并主要研究了湍流介质折射率结构常数C2n对空心光束传输特性的影响,得到了双半高斯空心光束在不同条件下传输时的光强分布.研究表明,C2n的增大加剧了近场中传输的空心光束的衍射效应,这不仅缩短了空心光束完全演变成为高斯光束时所需的传输距离,而且还增加了此后高斯光束向外扩展的程度.
Based on the Rayleigh-Sommerfeld diffraction integral theory, the propagation analytical expression of double-half Gaussian hollow beams in turbulent atmosphere is derived by using the cross spectral density function, and the effects of turbulent medium refractive index structure constant C 2n on the propagation characteristics of double half a hollow Gaussian beams are studied and the intensity distributions under the different conditions are obtained as well. The research results show that the increased C 2n can exacerbate the near-field diffraction effects of double-half Gaussian hollow beams, which not only shortens the propagation distance of hollow beams fully evolved into the Gaussian beams, but also increases the extent of the Gaussian beam extend outward.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第16期219-226,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61108029)资助的课题~~
关键词
双半高斯空心光束
瑞利-索末菲衍射积分
折射率结构常数
C2n
double-half Gaussian hollow beams, Rayleigh-Sommerfeld diffraction integral, refractive index structure constant C2n
