Experimental observation of multiple vortices in high-order laser mode induced by intracavity modulated resonator

Abstract Optical vortices with orbital angular momentum(OAM) have attracted increasing attention, and the generation of multi-vortices is of great importance, and the high-order Gauss mode has been a research hotspot in recent years. Therefore, the external cavity high-order He-Ne resonator in this paper directly generates various high-order Gauss multi-OAM vortex beams. By only adding the wire to disturb the oscillation of the resonator and adjusting the transverse or longitudinal inclination of the mirror, we can destroy the symmetry of the resonator and obtain high-order vortex beams with different numbers of vortices. The laser cavity can directly and controllably generate high-order Gauss vortex or non-vortex beam. The experiment has good robustness and easy operation, and has broad application prospects in optical communications. It will be used to realize orbital angular momentum multiplexing communication.