Does the structure of light influence the speckle size?
Abstract
It is well known that when a laser is reflected from a rough surface or transmitted through a diffusive medium, a speckle pattern will be formed at a given observation plane. Speckle is commonly produced by laser beams with a homogeneous intensity, for which, well-known relations have been derived, relating the speckle size to the area of illumination. Here we investigate the speckle generated by higher-order Laguerre-Gaussian (LG) modes, characterized by a non-uniform intensity distribution of concentric rings.We show that the ring-structure of the LG modes does not play any role in the speckle size, which happens to be the same as that obtained for a homogeneous intensity distribution. This allow us to provide with a simple expression that relates the speckle size to the spot size of the LG modes. Our findings will be of great relevance in many speckle-based applications.
Cite
@article{arxiv.1906.06509,
title = {Does the structure of light influence the speckle size?},
author = {Xiao-Bo Hu and Meng-Xuan Dong and Zhi-Han Zhu and Wei Gao and Carmelo Rosales-Guzman},
journal= {arXiv preprint arXiv:1906.06509},
year = {2019}
}
Comments
5 pages, 5 figures