A simple method to generate a hollow laser beam by multimode fiber is reported. A dark hollow laser beam is generated from a multimode fiber and the dependence of the output beam profile on the incident angle of laser beam is analyzed. The results show that this hollow laser beam can be used to trap and guide cold atoms.
© 2007 Chinese Optics Letters
Hongyu Ma, Huadong Cheng, Wenzhuo Zhang, Liang Liu, and Yuzhu Wang, "Generation of a hollow laser beam by a multimode fiber," Chin. Opt. Lett. 5, 460-462 (2007)