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When structured light is propagated through the atmosphere, turbulenceresults in modal scattering and distortions. An extensively studied example isthat of light carrying orbital angular momentum (OAM), where the atmosphere istreated as a phase distortion and numerical tools extract the resulting modalcross-talk. This approach focuses on the light itself, perturbed by theatmosphere, yet does not easily lend itself to physical insights, and fails toask a pertinent question: where did the OAM that the beam gained or lost comefrom? Here, we address this by forgoing the beam and instead calculating theOAM of the atmosphere itself. With this intuitive model we are able to drawgeneral conclusions on the impact of atmospheric turbulence on OAM beams, whichwe confirm experimentally. Our work alters the perspective on this problem,opening new insights into the physics of OAM in turbulence, and is easilyextended to other structured light fields through arbitrary aberrations.

The orbital angular momentum of a turbulent atmosphere and its impact on propagating structured light fields