Accurate and practical method for characterizing Laguerre–Gaussian modes

Abstract

We propose a new parameter, $Q_{p,l}^2$, based on cross-sectional intensity distribution to distinguish Laguerre–Gaussian (LG) beams. Theoretically, $Q_{p,l}^2$ shows an approximately linear dependence on the topological index in higher LG modes. Compared with the similar parameter $Q_{p,l}$ proposed by Long et al. [Opt. Lett. 38, 3047 (2013)] recently, our experimental result demonstrates that the approximate linearity of $Q_{p,l}^2$ brings out the advantage in characterizing higher topological indices. In addition, as more intensity data is used in calculating $Q_{p,l}^2$, the experimental error is diminished naturally. Thus, $Q_{p,l}^2$ can be used to easily and accurately characterize LG modes.

© 2014 Optical Society of America

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