为了研究大数值孔径物镜下角向偏振光聚焦特性，提高激光扫描共聚焦显微镜的分辨率，根据Richards和Wolf矢量衍射理论建立计算模型，分析大数值孔径物镜下角向偏振光及经过0~2 π 相位调制的角向偏振光的聚焦光斑。经过0~2 π 相位调制的角向偏振光的聚焦光斑为实心光斑；该光斑的半峰全宽比径向偏振光光斑的半峰全宽小17.6%，比圆偏振光光斑的半峰全宽小11.6%。计算结果表明，经过0~2 π 相位调制的角向偏振光光斑作为激光扫描共聚焦显微镜的激发光，可以提高其分辨率。

According to Wolf and Richard′s vectorial diffraction integral, a model is established and the focusing spots are analyzed to study the focusing of the azimuthally polarized beams and improve the resolution of laser scanning confocal microscope (LSCM). The azimuthally polarized beams focus into a hollow spot, but it becomes into a solid spot after 0~2 π phase modulation. The full-width at half-maximum (FWHM) of the azimuthally polarized spot after 0~2 π phase modulation is 17.6% smaller than that of the radially polarized spot, and is 11.6% smaller than that of the circular polarized spot. The azimuthally polarized spot after 0~2 π phase modulation which has a smaller focusing spot can improve the resolution for LSCM.