Detection of multiple coaxial optical vortices with a Shack-Hartman sensor in atmospheric turbulence

Jaime Cisternas*, Gustavo Funes, Jaime A. Anguita

*Autor correspondiente de este trabajo

Resultado de la investigación: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva

Resumen

The Shack-Hartmann wavefront sensor has proven to be a valuable detector particularly in the context of turbulence and adaptive optics. In this work we take advantage of its capacity of characterizing orbital-angular-momentum (OAM) states under certain conditions, in the context of a free-space optical communication link. First, we propose a method to compute the locations of the light spots created by the lenslet array that is more robust than the simple centroid formula when atmospheric turbulence is present. Second, we propose a “local OAM” estimation that avoids the computation of a circulation integral in the discrete Shack-Hartmann array. Our proposal does not require prior knowledge of beam diameter or OAM state. We show simulations and laboratory experiments for OAM beams in turbulence conditions at which reliable detection is feasible. We analyze the quality of detection as a function of turbulence strength, Shack-Hartmann resolution and number of acquisitions. These ideas can be applied to coherent coaxial superpositions of two or more OAM states if the light rings are non-overlapping. Using the concept of “optical ferris-wheels” introduced by Franke-Arnold et al. (2007), the detection can be implemented for a limited set of pairs of vortices. We propose a generalization of the recipe for generation of ferris-wheels now for pairs of orthogonal vortices with arbitrary OAM states. The proposal is supported by simulations in turbulence conditions. An extension of our work considers the use of error-correcting codes that take advantage of the large set of available combinations of OAM states.
Idioma originalInglés
Título de la publicación alojadaLaser Communication and Propagation through the Atmosphere and Oceans VII
EditoresAlexander M.J. Van Eijk, Jeremy P. Bos, Stephen M. Hammel
EditorialSPIE
ISBN (versión digital)9781510621114
DOI
EstadoPublicada - 2018
EventoLaser Communication and Propagation through the Atmosphere and Oceans VII 2018 - San Diego, Estados Unidos
Duración: 20 ago 201822 ago 2018

Serie de la publicación

NombreProceedings of SPIE - The International Society for Optical Engineering
Volumen10770
ISSN (versión impresa)0277-786X
ISSN (versión digital)1996-756X

Conferencia

ConferenciaLaser Communication and Propagation through the Atmosphere and Oceans VII 2018
País/TerritorioEstados Unidos
CiudadSan Diego
Período20/08/1822/08/18

Nota bibliográfica

Publisher Copyright:
© 2018 SPIE.

Huella

Profundice en los temas de investigación de 'Detection of multiple coaxial optical vortices with a Shack-Hartman sensor in atmospheric turbulence'. En conjunto forman una huella única.

Citar esto