English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Laser Doppler rotational velocimetry has emerged as a pivotal technology for astronomical survey and remote sensing. While high-order optical vortices are commonly used for accurate rotating velocimetry, their large annular radii can pose a challenge when detecting a small cross-section rotator directly. Here, we overcome this limitation by exploiting perfect Laguerre-Gaussian (PLG) light modes carrying orbital angular momentum, based upon the rotational Doppler effect. In this situation, the beating frequency signals can be observed as well, regardless of the rotator being exposed to the symmetrically or asymmetrically superposed PLG light modes, thus revealing the linked rotating velocity. What&#x2019;s more, a direct proof-of-principle experiment is conducted to validate the performance of the velocimetry system. It shows that &#x00B1;15-order modes provide the optimal sensitivity of detecting rotating velocity, corresponding to a relative uncertainty of below 0.48%. In contrast to the existing techniques, our rotating velocimetry platform not only enables small target detection, but also offers a tunable flexibility together with a higher velocimetry accuracy. This hence indicates the generation of a high-accuracy rotating velocimetry pathway by resorting to the perfect structured vortex light modes. Such validated findings might be useful for practical optical metrology and remote sensing scenarios.

Rotating velocimetry based upon rotational Doppler effect of perfect Laguerre-Gaussian light modes