Measurement Of The Radial Mode Spectrum Of Photons Through A Phase-Retrieval Method

Abstract

We propose and demonstrate a simple and easy-to-implement projective-measurement protocol to determine the radial index p of a Laguerre–Gaussian (LGlp) mode. Our method entails converting any specified high-order LG0p mode into a near-Gaussian distribution that matches the fundamental mode of a single-mode fiber (SMF) through the use of two phase screens (unitary transforms) obtained by applying a phase-retrieval algorithm. The unitary transforms preserve the orthogonality of modes before the SMF and guarantee that our protocol can, in principle, be free of crosstalk. We measure the coupling efficiency of the transformed radial modes to the SMF for different pairs of phase screens. Because of the universality of phase-retrieval methods, we believe that our protocol provides an efficient way of fully characterizing the radial spatial profile of an optical field.

Publication Date

12-15-2018

Publication Title

Optics Letters

Volume

43

Issue

24

Number of Pages

6101-6104

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.43.006101

Socpus ID

85058772604 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85058772604

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