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中文摘要：
利用Richards-Wolf矢量衍射积分模型,推导双环角向偏振光束经过环状高数值孔径透镜聚焦后聚焦区域的偏振特性,并用数值计算分析各相关参数的取值变化对焦面光斑的偏振分布的影响.研究表明：双环角向偏振光束经过环状高数值孔径透镜聚焦以后,其光斑内环的偏振方向发生改变;通过控制各相关参数的取值,可以控制聚焦光斑的偏振分布,形成一种可控的偏振开关.
英文摘要：
By using the Richards-Wolf vector diffraction theory,the polarization properties in focused area of a double-ring-shaped azimuthally polarized beam through an annular high numerical aperture lens are studied in this paper.Numerical calculations are performed to compare the influence of corresponding parameters on the tight polarization properties.It is shown that tight focusing of a double-ring-shaped azimuthally polarized beam can change the polarization direction of the inner ring in the focal field.The correlated parameters changed,the polarization direction shows gradual change and controllable polarization switch occurred.
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Spectral and polarization properties of stochastic electromagnetic beams propagating in gain or abso
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