Wan Zhenyu, Tang Ziyi, Zhang Xi, Padgett Miles J, Wang Jian
Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China.
Optics Valley Laboratory, Wuhan, 430074, Hubei, China.
Light Sci Appl. 2025 Feb 17;14(1):88. doi: 10.1038/s41377-025-01747-8.
In recent years, with the clarification of the mechanism of the rotational Doppler effect (RDE), there has attracted extensive attention to its development of applications, especially in the detection of the angular velocity of rotating objects. On the other hand, optical fiber technology is widely applied in laser velocimetry from beam delivery to scattered light collection, aiding the miniaturization of instruments. Here we report the first all-fiber rotational Doppler velocimetry (AF-RDV) with a single probe based on a fabricated mode-sculpted fiber-optic element. The constructed AF-RDV can be operated in two reciprocal schemes wherein exchanging the illuminating mode and detected mode. Using this, we experimentally demonstrate the mode-changing dependent nature of the RDE. Particularly, the results suggest that the rotational Doppler shift can be observed by mode-filtering the scattered signal even with a non-twisted probe light. We also show the achromatic property of the RDE by scanning the incident wavelength, enabling the AF-RDV within an ultra-broadband operation range. The AF-RDV exhibits favorable performance for detecting spinning rough surfaces. It may provide an exciting new practical sensing instrument with significant prospects for monitoring angular motion in both research and industry.
近年来，随着旋转多普勒效应（RDE）机制的阐明，其应用发展引起了广泛关注，特别是在旋转物体角速度检测方面。另一方面，光纤技术在激光测速中从光束传输到散射光收集都有广泛应用，有助于仪器的小型化。在此，我们报道了基于制造的模式雕刻光纤元件的首个单探头全光纤旋转多普勒测速仪（AF-RDV）。构建的AF-RDV可以在两种互易方案中运行，即交换照明模式和检测模式。利用此方法，我们通过实验证明了RDE的模式变化依赖性。特别地，结果表明即使使用非扭曲的探测光，通过对散射信号进行模式滤波也能观察到旋转多普勒频移。我们还通过扫描入射波长展示了RDE的消色差特性，使AF-RDV能够在超宽带工作范围内运行。AF-RDV在检测旋转粗糙表面方面表现出良好性能。它可能提供一种令人兴奋的新型实用传感仪器，在研究和工业中监测角运动具有重要前景。
