Based on vectorial Debye theory, tight focusing of radially and azimuthally polarized vortex beams passing through a dielectric interface are studied. The intensity distribution in the focal region is illustrated by n...Based on vectorial Debye theory, tight focusing of radially and azimuthally polarized vortex beams passing through a dielectric interface are studied. The intensity distribution in the focal region is illustrated by numerical calculations. We show the influence of numerical-aperture （NA） on the full-width at half maximum （FWHM） of the focal spot or the focal hole. It has been found that compared with the azimuthally polarized Besse^Gaussian （BG） beams, the longitudinal component in the z direction of the radially polarized BG beams has no influence on the FWHM of the focal spot and hole, but enhances the total light intensity.展开更多
实验利用YAG/Nd∶YAG/Cr4+∶YAG键合晶体和光子晶体光栅镜获得高峰值功率和高光束质量的被动调Q径向脉冲激光输出,激光器的输出功率达到435 m W,斜率效率为14.7%。在吸收抽运功率为6.8 W时,输出激光脉冲的峰值功率达到15.7 k W,脉冲能...实验利用YAG/Nd∶YAG/Cr4+∶YAG键合晶体和光子晶体光栅镜获得高峰值功率和高光束质量的被动调Q径向脉冲激光输出,激光器的输出功率达到435 m W,斜率效率为14.7%。在吸收抽运功率为6.8 W时,输出激光脉冲的峰值功率达到15.7 k W,脉冲能量达到50.1 m J,脉冲宽度为3.2 ns,重复频率为8.1 k Hz,径向偏振纯度为95.8%。实验中的晶体均采用<111>的切割方向,输出径向偏振光束的均匀性得到提高。展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 60477041, the Key Project of Science and Technology of Fujian Province under Grant No 2007H0027, and the Foundation of Science and Technology Development of Southwest Jiaotong University of China under Grant No 2006B01.
文摘Based on vectorial Debye theory, tight focusing of radially and azimuthally polarized vortex beams passing through a dielectric interface are studied. The intensity distribution in the focal region is illustrated by numerical calculations. We show the influence of numerical-aperture （NA） on the full-width at half maximum （FWHM） of the focal spot or the focal hole. It has been found that compared with the azimuthally polarized Besse^Gaussian （BG） beams, the longitudinal component in the z direction of the radially polarized BG beams has no influence on the FWHM of the focal spot and hole, but enhances the total light intensity.
文摘实验利用YAG/Nd∶YAG/Cr4+∶YAG键合晶体和光子晶体光栅镜获得高峰值功率和高光束质量的被动调Q径向脉冲激光输出,激光器的输出功率达到435 m W,斜率效率为14.7%。在吸收抽运功率为6.8 W时,输出激光脉冲的峰值功率达到15.7 k W,脉冲能量达到50.1 m J,脉冲宽度为3.2 ns,重复频率为8.1 k Hz,径向偏振纯度为95.8%。实验中的晶体均采用<111>的切割方向,输出径向偏振光束的均匀性得到提高。
