摘要
研究了部分相干异常涡旋光束在湍流大气中传输时的光强特性和有效光斑尺寸。利用广义惠更斯-菲涅尔积分式推导了部分相干异常涡旋光束的互相干函数的表达式,并在此基础之上得到部分相干异常涡旋光束的光强和有效光斑尺寸的表达式。通过数值模拟分析了部分相干异常涡旋光束的归一化光强分布和有效光斑尺寸随空间相干长度和折射率常数的变化情况。研究结果表明:部分相干异常涡旋光束比完全相干异常涡旋光束受大气湍流的影响更小。而且随着空间相干长度的减小和大气折射率常数的增加,异常涡旋光束光强的中心点强度和有效光斑尺寸逐渐增加。
The intensity and effective beam width of the partially coherent anomalous vortex beams propagating through turbulent atmosphere are investigated in the paper.Based on the extended Huygens-Fresnel integral,the expressions for the intensity and effective beam width of the partially coherent anomalous vortex beam are derived.The propagation properties of the partially coherent anomalous vortex beams are studied via a set of numerical examples.Numerical results reveal that the intensity of the partially coherent anomalous vortex beam is less affected by the atmospheric turbulencethan the fully coherent anomalous vortex beam.With the increasing of refractive index structure constant while the decreasing of correlation length,the central intensity and effective beam width of anomalous vortex beams increases gradually.
作者
黎芳
刘慧
LI Fang;LIU Hui(School of Science,Beijing University of Civil Engineering and Architecture,Beijing 102616,China;School of Electrical and Information Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102616,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2020年第1期9-12,共4页
Laser & Infrared
基金
国家自然科学基金项目(No.41801229)
北京市教育委员会科技计划一般项目(No.KM20181001600117,No.KM201710016008)资助。
关键词
异常涡旋光束
部分相干
大气湍流
光强
有效光斑尺寸
anomalous vortex beam
partially coherent
atmospheric turbulence
intensity
effective beam width
