The role of beam waist in Laguerre-Gauss expansion of vortex beam

Abstract

Laguerre-Gauss (LG) modes represent an orthonormal basis set of solutions of the paraxial wave equation. LG are characterized by two integer parameters $n$ and $\ell$ that are related to the radial and azimuthal profile of the beam. The physical dimension of the mode is instead determined by the beam waist parameter $w_0$: only LG modes with the same $w_0$ satisfy the orthogonality relation. Here, we derive the scalar product between two LG modes with different beam waists and show how this result can be exploited to derive different expansions of a generic beam in terms of LG modes. In particular, we apply our results to the recently introduced Circular Beams, by deriving a previously unknown expansion. We finally show how the waist parameter must be chosen in order to optimize such expansion.

5 pages

References in corpus (8)

• Twisting of light around rotating black holes
• Hypergeometric-Gaussian Modes
• Experimental implementation of a Kochen-Specker set of quantum tests
• Improved focusing with Hypergeometric-Gaussian type-II optical modes
• Device-independent certification of high-dimensional quantum systems
• On the properties of Circular-Beams
• Birth and evolution of an optical vortex
• A general theorem on the divergence of vortex beams

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