An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Measurement of the radial mode spectrum of photons through a phase-retrieval method
Published
Author(s)
Omar S. Magana Loaiza
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.
Magana, O.
(2018),
Measurement of the radial mode spectrum of photons through a phase-retrieval method, Optics Letters, [online], https://doi.org/10.1364/OL.43.006101
(Accessed June 10, 2023)