摘要
基于部分相干光理论研究了非相干单色LED光源的空间相干特性对无衍射Bessel光束形成的影响。部分相干光经过轴棱锥,光强分布函数中出现了高阶的Bessel函数项,其光强为各阶Bessel函数的线性叠加。数值模拟了部分相干光通过轴棱锥后的光场分布,发现空间相干长度越小,高阶项造成的影响越大,所形成的光束与理想Bessel光束的差异越明显,暗环处光强不再为零,截面光强分布图越模糊。通过一套可调控光束空间相干长度的实验室装置,产生了较为理想的Bessel光束,实验结果与理论模拟相符。
Based on the theory of partially coherent light, this article studies the influence of the spatial coherence of incoherent monochromatic LED light source on the generation of Bessel beam. When the partially coherent light goes through an axicon, higher-order Bessel functions appear in the light intensity distribution, and the light intensity is the linear superposition of each-order Bessel functions. Light intensity distributions are numerically simulated. The result shows that the shorter initial coherent length is, the greater the effect of high-order derivatives is, and more obvious the difference between Bessel beam and the ideal Bessel is, and that the light intensity is non-zero in dark rings and section of light distributions is fuzzier. Through an experimental setup that can regulate initial coherent length of light, nearly ideal Bessel beam is generated. The experimental results agree with theoretical analysis.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第2期14-19,共6页
Acta Optica Sinica
基金
国家自然科学基金(60977068
61178015)
福建省自然科学基金项目(2012J01278)
泉州市科技重点项目(2011G9)资助课题
