Hernandez-Aranda Raul I, Gutiérrez-Vega Julio C
Photonics and Mathematical Optics Group, Tecnológico de Monterrey, Monterrey, México 64849.
Opt Express. 2008 Apr 14;16(8):5838-48. doi: 10.1364/oe.16.005838.
The three dimensional distribution of focused vector Mathieu-Gauss beams (vMG) is studied in the vicinity of the geometrical focus of an unapertured thin lens. We adopt two different intensity based criteria for defining the actual focus. Our analysis confirms the existence of a focal shift towards the lens for this type of beams. The dependence of the focal shift on the different parameters of the beams is discussed in detail. Beams with different states of polarization are studied as well, and it is shown that the focal shift is independent of the polarization.
研究了无孔径薄透镜几何焦点附近聚焦矢量马蒂厄 - 高斯光束(vMG)的三维分布。我们采用两种基于强度的不同标准来定义实际焦点。我们的分析证实了这类光束存在向透镜方向的焦移。详细讨论了焦移对光束不同参数的依赖性。还研究了具有不同偏振态的光束,结果表明焦移与偏振无关。