Infrared and Laser Engineering, Volume. 50, Issue 9, 20210451(2021)
Rotational frequency detection of spinning objects at general incidence using vortex beam (Invited)
The vortex beam is a kind of spatially structured optical beam carrying orbital angular momentum, whose frequency shifts when it illuminates the surface of a rotating object. This phenomenon, known as the optical rotational Doppler effect (RDE), can be used to obtain the rotation frequency of a flat object by measuring the frequency shift. While the frequency shift is influenced by the incident condition, by revealing the influencing law of incident condition, the rotational frequency of the object can be measured directly. Firstly, a method of velocity projection was used to analyze the mechanism of optical RDE. Then, the rotational Doppler frequency shift distribution law at general incidence of vortex beam was obtained, and the theoretical method of extracting the rotational frequency was proposed. In the end, an experiment of RDE using a superimposed Laguerre-Gaussian beam with topological charge
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You Ding, Yuansheng Ding, Song Qiu, Tong Liu, Yuan Ren. Rotational frequency detection of spinning objects at general incidence using vortex beam (Invited)[J]. Infrared and Laser Engineering, 2021, 50(9): 20210451
Category: Special issue-Manipulation on optical vortex and its sensing application
Received: Jul. 4, 2021
Accepted: --
Published Online: Oct. 28, 2021
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