涡旋梳光谱技术
Vortex-comb spectroscopy
AI总结：
提出基于旋转多普勒效应的涡旋梳光谱技术，利用OAM模式实现仅受测量时间限制的高分辨率、快速模式分辨测量。
摘要：
我们提出一种基于旋转多普勒效应的新型傅里叶变换光谱技术。该技术为光学涡旋频率梳提供了应用场景，其中每个频率分量都携带着独特数量的轨道角动量（OAM）。在此，我们利用一台可调谐单频激光器和一组螺旋相位板来模拟涡旋梳，生成多达11种不同的OAM模式。与基于迈克尔逊干涉仪（线性多普勒效应）的传统傅里叶变换光谱技术不同，涡旋梳光谱技术的光谱分辨率不受仪器机械扫描距离的限制，而仅受测量时间限制。尽管该光谱仪仅需一个自由运行的频率梳，但其下变频方案类似于双梳光谱技术，从而实现快速的模式分辨测量。
英文摘要：
We propose a new Fourier-transform spectroscopy technique based on the rotational Doppler effect. The technique offers an application for optical vortex frequency combs, where each frequency component carries a unique amount of orbital angular momentum (OAM). Here, we emulate a vortex comb using a tunable single frequency laser and a collection of spiral phase plates, generating up to eleven distinct OAM modes. Unlike in traditional Fourier-transform spectroscopy based on the Michelson interferometer (linear Doppler effect), the spectral resolution of vortex-comb spectroscopy is not limited by the mechanical scan distance of the instrument but only by the measurement time. Although the spectrometer requires just one free-running frequency comb, the down-conversion scheme resembles dual-comb spectroscopy, leading to fast mode-resolved measurements.
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