We carry out an experimental and theoretical study of the focusing properties of a Gaussian Schell-model (GSM) vortex beam. It is found that we can shape the beam profile of the focused GSM vortex beam by varying its initial spatial coherence width. Focused dark hollow, flat-topped, and Gaussian beam spots can be obtained in our experiment, which will be useful for trapping particles. The experimental results agree well with the theoretical results.
© 2011 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: July 6, 2011
Manuscript Accepted: July 26, 2011
Published: August 15, 2011
Fei Wang, Shijun Zhu, and Yangjian Cai, "Experimental study of the focusing properties of a Gaussian Schell-model vortex beam," Opt. Lett. 36, 3281-3283 (2011)