Anderson Alexander Q, Strong Elizabeth F, Coburn Sean C, Rieker Gregory B, Gopinath Juliet T
Opt Express. 2022 Jun 6;30(12):21195-21210. doi: 10.1364/OE.457238.
We present a dual-comb interferometer capable of measuring both the range to a target as well as the target's transverse rotation rate. Measurement of the transverse rotation of the target is achieved by preparing the probe comb with orbital angular momentum and measuring the resultant phase shift between interferograms, which arises from the rotational Doppler shift. The distance to the target is measured simultaneously by measuring the time-of-flight delay between the target and reference interferogram centerbursts. With 40 ms of averaging, we measure rotation rates up to 313 Hz with a precision reaching 1 Hz. Distances are measured with an ambiguity range of 75 cm and with a precision of 5.9 µm for rotating targets and 400 nm for a static target. This is the first dual-comb ranging system capable of measuring transverse rotation of a target. This technique has many potential terrestrial and space-based applications for lidar and remote sensing systems.
我们展示了一种双梳状干涉仪，它能够测量到目标的距离以及目标的横向旋转速率。通过制备具有轨道角动量的探测梳状光，并测量干涉图之间由旋转多普勒频移引起的合成相移，实现对目标横向旋转的测量。通过测量目标与参考干涉图中心脉冲之间的飞行时间延迟，同时测量到目标的距离。经过40毫秒的平均，我们测量到高达313赫兹的旋转速率，精度达到1赫兹。对于旋转目标，测量距离的模糊范围为75厘米，精度为5.9微米；对于静态目标，精度为400纳米。这是首个能够测量目标横向旋转的双梳状测距系统。该技术在激光雷达和遥感系统的许多潜在地面和天基应用中具有重要作用。
