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Rotational Doppler shift from a rotating rod

Abstract : This Letter reports on a rotational Doppler effect obtained from a rotating rod illuminated by a fundamental Gaussian laser beam. More specifically, we decompose the transmitted light behind the rotating rod into Laguerre-Gaussian modes and investigate the associated frequency shifts. The main contributing modes correspond to modes having the same rotational symmetry as the rotating object. Furthermore, their shifts equal the topological charge of the beam times the rotational frequency of the object. Potential applications in pattern recognition and rotation identification are then considered. (C) 2021 Optical Society of America
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https://hal.archives-ouvertes.fr/hal-03330279
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Submitted on : Monday, September 20, 2021 - 4:17:46 PM
Last modification on : Tuesday, October 19, 2021 - 10:36:35 PM

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Olivier Emile, Janine Emile, Christian Brousseau, Tangi Le Guennic, Pu Jian, et al.. Rotational Doppler shift from a rotating rod. Optics Letters, Optical Society of America - OSA Publishing, 2021, 46 (15), pp.3765-3768. ⟨10.1364/OL.435058⟩. ⟨hal-03330279⟩

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