Research on generation of high-order vortex beams

Loading a spiral phase plate on the liquid crystal spatial light modulator is a good method to generate high quality vortex beams. While due to the limited resolution of liquid crystal spatial light modulator, loading high order spiral phase plate contributes to phase distortion in the center, and results in lower beam quality. By the method of using blazed grating in the center of spiral phase plate, this limitation is overcome, and the high quality of high-order single-mode or multiplexed vortex beams are obtained, a good method is provided to generate high-order vortex beams.