Jo相干角向偏振涡旋光束的深聚焦

摘要

通过矢量德拜理论,研究了J0相干角向偏振涡旋光束深聚焦的性质.推导了在焦点区域的光强分布、光谱相干度和偏振度的表达式.数值模拟结果表明,光强分布、相干度和偏振度不仅依赖于相干长度和数值孔径最大角,而且依赖于拓扑电荷数.这种光束在焦平面还可获得非常小的焦点和焦洞.%By expanding the vectorial Debye theory into the tight focusing of J(0)-correlated field,the intensity,correlation and polarization properties of J0-correlated azimuthally polarized vortex beams are studied.Expressions are derived for the intensity distribution,the spectral degree of coherence and the degree of polarization in the focal region.It is found that the intensity distributions,the degrees of correlation and the polarization of focused field are dependent not only on the correlation length and the numerical aperture maximal angle but also on the topological charge.It is also shown that such beam in the focal plane can obtain the highly confined focal spot and the focal hole.