A bottle beam generated by a ring obstacle-axicon
环形障碍物-轴棱锥产生局域空心光束

A new method of generating bottle beam was proposed for the first time, which is compriecs a traditional axicon with a ring obstacle at its underside. When a plane wave illuminates the bottom of axicon with ring obstacle, a bottle beam is generated within the maximum non-diffractional distance, and the beam keeps as non-diffractional Bessel beam in front and behind the bottle beam. Controlling the size of bottle beam is realized by changing the size of obstacle or cone angle of axicon. The principle of generating bottle beam when a plane wave illuminates the ring obstacle-axicon was described using the diffraction theory. The transverse intensity distribution of the bottle beam in propagation and the three-dimensional intensity distribution of the whole process were analyzed and simulated, and the experiment results were presented. The result shows significant guidance value for the practical application of the bottle beam.