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We present an experimental campaign consisting on the propagation of laser modes with orbital angular momentum (OAM), carried out in our campus, for a total propagation distance of 1 kilometer. In this proceedings article we describe our experiment and describe some preliminary results, using topological charges up to |ℓ| = 45. We also demonstrate that a Shack-Hartmann sensor may be used for OAM sensing in the presence of weak to intermediate turbulence without the help from adaptive optics.
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Jaime A. Anguita, Carlos Pirela, Jaime E. Cisternas, "Experimental campaign for the propagation and measurement of OAM beams over a 1-km terrestrial range," Proc. SPIE 12237, Laser Communication and Propagation through the Atmosphere and Oceans XI, 122370F (30 September 2022); https://doi.org/10.1117/12.2633018