Bessel beam generator and optical scanning device using it

摘要

PROBLEM TO BE SOLVED: To improve the degree of freedom in design. According to the present invention, a laser beam emitted from one light source is divided and emitted inward in a donut shape from an optical fiber arranged on the same circle to focus in the vicinity of the center. It is possible to realize a Bessel beam generator that emits a disk irradiation beam. This makes it possible to generate a disk irradiation beam without reducing the amount of light without damaging the central portion having a large amount of light. [Selection diagram] Fig. 1