X. Ren

Optical vortex phase-shifting digital holography.

Cheng-Shan Guo, Jianping Ding, Cheng-Shan Guo, 2004, Optics express.

Optimal annular computer-generated holograms for the generation of optical vortices.

Xuan Liu, Cheng-Shan Guo, Huitian Wang, 2005, Journal of the Optical Society of America. A, Optics, image science, and vision.