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.

© 2021 Optical Society of America

Rotational Doppler effect on reflection upon an ideal rotating propeller

Olivier Emile, Janine Emile, Christian Brousseau, Tangi le Guennic, Pu Jian, and Guillaume Labroille
J. Opt. Soc. Am. B 39(7) 1945-1949 (2022)

Observation of the rotational Doppler shift of a white-light, orbital-angular-momentum-carrying beam backscattered from a rotating body

Martin P. J. Lavery, Stephen M. Barnett, Fiona C. Speirits, and Miles J. Padgett
Optica 1(1) 1-4 (2014)

Observation of the rotational Doppler shift with spatially incoherent light

Alexander Q. Anderson, Elizabeth F. Strong, Brendan M. Heffernan, Mark E. Siemens, Gregory B. Rieker, and Juliet T. Gopinath
Opt. Express 29(3) 4058-4066 (2021)

Self-mixing in low-noise semiconductor vortex laser: detection of a rotational Doppler shift in backscattered light

Mohamed Seghilani, Mikhaël Myara, Isabelle Sagnes, Baptiste Chomet, Ryad Bendoula, and Arnaud Garnache
Opt. Lett. 40(24) 5778-5781 (2015)

Measurement of the rotational Doppler frequency shift of a spinning object using a radio frequency orbital angular momentum beam

Mingyang Zhao, Xinlu Gao, Mutong Xie, Wensheng Zhai, Wenjing Xu, Shanguo Huang, and Wanyi Gu
Opt. Lett. 41(11) 2549-2552 (2016)