Rotation-dependent nonlinear absorption of orbital angular momentum beams in ruby

Musarra, G. and Wilson, K. E. and Faccio, D. and Wright, E. M. (2018) Rotation-dependent nonlinear absorption of orbital angular momentum beams in ruby. Optics Letters, 43 (13). pp. 3073-3075. ISSN 0146-9592 (https://doi.org/10.1364/OL.43.003073)

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Abstract

We investigate the effect of a rotating medium on orbital angular momentum (OAM)-carrying beams by combining a weak probe beam shifted in frequency relative to a strong pump beam. We show how the rotational Doppler effect modifies the light-matter interaction through the external rotation of the medium. This interaction leads to an absorption that increases with the mechanical rotation velocity of the medium and with a rate that depends on the OAM of the light beam.