Remote angular velocity measurement by the cascaded rotational Doppler effect

Guo, Zhendong; Meng, Jinglin; An, Min; Cheng, Pengxiang; Jia, Junliang; Chang, Zehong; Wang, Xiaoli; Zhang, Pei

doi:10.1364/ao.438997

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…The reflecting propellor is also an ordinary surface. It doesn't operate any topological charge transformation like the ones performed with spiral phase plates, phase conjugated mirrors, or helicoidal reflectors [11,13,24]. As soon as the reflected beam doesn't correspond to the fundamental beam and could be decomposed in a LG basis, the non-zero LG beams do experience a rotational Doppler shift that could be detected.…”

Section: Discussionmentioning

confidence: 99%

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Rotational Doppler effect on reflection upon an ideal rotating propeller

Émile

Brousseau

et al. 2022

J. Opt. Soc. Am. B

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The rotational Doppler shift is the counterpart of the usual linear Doppler effect for rotating bodies. We study by an experimental approach coupled with theoretical considerations the rotational shift of a fundamental laser light reflected on an ideal rotating propeller. We decompose the reflected light on a Laguerre–Gaussian basis and show that only modes having the same rotational symmetry as the propeller are involved in the decomposition. The latter experience a frequency shift proportional to the rotation frequency of the propeller and the topological charge of the beam. Extensions of this work in the microwave domain are then considered.

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Section: Discussionmentioning

confidence: 99%

“…In our experiment, the rotating object and the fixed mirror together, mimic a reflection from a propeller. However, as the light passes twice through the object, one may wonder whether it could induce a cascade Doppler effect [24]. This is not the case for the following reason.…”

Section: Rotational Doppler Shiftmentioning

confidence: 99%

Rotational Doppler effect on reflection upon an ideal rotating propeller

Émile

Brousseau

et al. 2022

J. Opt. Soc. Am. B

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“…If the two components of the superposition beam have the same OAM number but opposite signs, this superposition beam can be called the phase-conjugated beam which has the selfinterference property and is immune to the influence of the linear motion [22,23]. These concepts were soon extended from linear optics to nonlinear optics and even quantum physics and many new applications have been derived [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Rotational Doppler Effect With Vortex Beams: Fundamental Mechanism and Technical Progress

Liu

Chen

et al. 2022

Front. Phys.

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Structured light beams such as optical vortices can carry the orbital angular momentum (OAM) with an unbounded quantum number. Recent years have witnessed a growing interest in the rotational Doppler effect with vortex light. Here we present an overview on the technical progress in measuring the rotational Doppler effect associated with OAM. This includes how a high-order OAM light beam is crucial for realizing high-sensitivity remote sensing of rotating objects. The basic physical mechanism of rotational Doppler effect is manifested from both perspectives of the wave property and the conservation law of energy. Besides, we summarize the extension of the rotational Doppler effect from linear optics to nonlinear optics, and to quantum realms. Also, we discuss the main challenges and opportunities of angular remote sensing in a realistic scenario for future applications.

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“…As a powerful measurement tool, Doppler velocimetry has been applied in many areas in our world [1]. In recent years, with the rise of research on vortex structured beams, the rotational Doppler effect (RDE) has gradually become a research hot topic [2][3][4][5][6][7][8][9][10]. The concept of the RDE can be traced back to as early as the 1980s, when Bruce et al introduced the concept of angular Doppler effect, which was associated with the spin angular momentum (SAM) [11].…”

Section: Introductionmentioning

confidence: 99%

Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect

et al. 2022

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The rotational Doppler effect (RDE), as a counterpart of the conventional well-known linear Doppler effect in the rotating frame, has attracted increasing attention in recent years for rotating object detection. However, the effect of the beam size on the RDE is still an open question. In this article, we investigated the influence of the size of the probe light; i.e., the size of the ring-shaped orbital angular momentum (OAM)-carrying optical vortex (OV), on the RDE. Both the light coaxial and noncoaxial incident conditions were considered in our work. We analyzed the mechanism of the influence on the RDE under the light coaxial, lateral misalignment, and oblique incidence conditions based on the small-scatterer model. A proof-of-concept experiment was performed to verify the theoretical predictions. It was shown that both the signal-to-noise ratio and the frequency spectrum width were related to the OV size. The larger the beam size, the stronger the RDE signal observed in the practical detection. Especially in the lateral misalignment condition, the large OV size effectively reduced the signal spreading and enhanced the signal strength. These findings may be useful for practical application of the optical RDE in remote sensing and metrology.

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Remote angular velocity measurement by the cascaded rotational Doppler effect

Cited by 10 publications

References 34 publications

Rotational Doppler effect on reflection upon an ideal rotating propeller

Rotational Doppler effect on reflection upon an ideal rotating propeller

Rotational Doppler Effect With Vortex Beams: Fundamental Mechanism and Technical Progress

Detection of a Spinning Object at Different Beam Sizes Based on the Optical Rotational Doppler Effect

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