产生不同类型局域空心光束的可拆式组合轴棱锥

Detachable Combined Axicon for Gennerating Different Types of Bottle Beam

提出一种产生尺寸可调局域空心光束的新型光学元件——可拆式组合轴棱锥,这种新型光学元件是在传统轴棱锥的中部沿其轴线方向贯通开设一圆孔,在圆孔内嵌设一第二轴棱锥组成。通过更换不同底角的第二轴棱锥(或第一轴棱锥),可形成不同尺寸的单个局域空心光束或周期性局域空心光束。从几何光学出发分析了产生局域空心光束的原理,计算了局域空心光束的相关参量。由衍射积分理论分析和模拟了新型光学元件的光强分布特性。几何光学和衍射理论所得分析结果基本吻合。

A new optical component named detachable combined axicon for generating size adjustable bottle beam is proposed. This new type of optical element is opened a circular hole in the central part of the traditional axicon along the axis. Then a sencond axicon which is maded of common glass materials is embed in the circular hole. Single bottle beams or periodic bottle beams of different size can be generated by the way of replacing the second axicon （or the first axicon） of different base angle in this new optical element. Based on the geometrical optics, the principle of the generation of bottle beam is analysised and the related paramaters of the bottle beam are calculated. According to the Fresnel diffraction integral theory, the intensity distribution of the beam passing through this new optical element is simulated. The results of experiments coincide exactly with the therory discussed above.