Numerical calculations show that after focused by the axicon, a vortex beam can convert into a high-order Besselbeam.
数值模拟结果表明，涡旋光束经过轴棱锥聚焦后可获得高阶贝塞尔光束。
2
Nowadays, these light beams are divided into two kinds: one is hollow beam, such as Laguerre-Gaussian beam and high-order Besselbeam;
目前，具有轨道角动量的光束主要分为两大类：一、空心光束，例如拉盖尔高斯光束和高阶贝赛尔光束；
3
Results show that if the cross-section of the axicon is ideally manufactured in circular symmetry, the field distribution behind the axicon is approximately an ideal Besselbeam.