摘要
采用横截面上光强的精确表述 ,分析了单色平面波微小圆孔衍射后 ,其衍射光束的传输特性 .发现二阶矩定义下的衍射光束束宽满足一般的双曲线传输规律 .数值计算表明 ,在微小圆孔半径小于 0 .1 7个波长时 ,衍射光束的光束传输因子小于
Based on the accurate expression of light intensity at transverse plane,the propagation characteristics of monochromatic planar wave diffracted by small circular aperture are analyzed in this paper.The beam width defined by the second order moment of the light intensity follows a general hyperbolic propagation law.The results also show that M 2 factor of the diffracted beam is smaller than unity when the radius of the small circular aperture is smaller than 0.17 times of the wavelength.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2002年第7期874-876,共3页
Acta Photonica Sinica
基金
国家自然科学基金 (1 99740 3 8)资助项目
关键词
平面波
微小圆孔
衍射
传输特性
光速传输因子
衍射光束
Small circular aperture
Diffraction
Propagation characteristics
Beam propagation factor
