We have experimentally generated higher order optical vortices and scattered them through a ground glass plate that results in speckle formation. Intensity autocorrelation measurements of speckles show that their size decreases with an increase in the order of the vortex. It implies an increase in the angular diameter of the vortices with their order. The characterization of vortices in terms of their annular bright ring also helps us to understand these observations. The results may find applications in stellar intensity interferometry and thermal ghost imaging.
© 2014 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: May 1, 2014
Revised Manuscript: June 10, 2014
Manuscript Accepted: June 10, 2014
Published: July 21, 2014
Salla Gangi Reddy, Shashi Prabhakar, Ashok Kumar, J. Banerji, and R. P. Singh, "Higher order optical vortices and formation of speckles," Opt. Lett. 39, 4364-4367 (2014)