Focal shift of cylindrical vector axisymmetric Bessel-modulated Gaussian beam with radial variance phase wavefront |
| |
Authors: | Xiumin Gao Qi Wang Maojin Yun Hanming Guo Jian Wang Songlin Zhuang |
| |
Institution: | aElectronics & Information College, Hangzhou Dianzi University, Hangzhou 310018, China;bOptics & Electronics College, University of shanghai for Science and Technology, Shanghai 200093, China;cCollege of Physics Science, Qingdao University, Qingdao 266071, China |
| |
Abstract: | Axisymmetric Bessel-modulated Gaussian beam with quadratic radial dependence (QBG beam) has attracted much attention recently. In this paper, the focal shift of the cylindrical vector QBG beam with radial variance phase wavefront is investigated theoretically by vector diffraction theory. Results show that focus shifts considerably by changing the phase parameter C that indicates the radial phase variance speed. Under condition of small beam parameter μ of cylindrical vector QBG beam, there is one focal peak that shifts far away from optical aperture on increasing C. When μ increases, there may occur two focal peaks that also shift remarkably on increasing C. And it was found that the dependence of focal shift distance on increasing phase parameter is linear. Phase parameter adjusts the focal shift distance, while, polarization angle does not affect focal shift obviously. |
| |
Keywords: | Focal shift Vector beam Axisymmetric Bessel-modulated Gaussian beam Phase wavefront |
本文献已被 ScienceDirect 等数据库收录! |
|