arXiv 2405.061512024-05-10physics.opticsphysics.ins-det

回音壁模式的超高精度光梳锁定太赫兹频域光谱

Ultra-high precision comb-locked terahertz frequency-domain spectroscopy of whispering-gallery modes

Sebastian Müller, Kane Hill, Dominik Walter Vogt, Thomas A. Puppe, Rafal Wilk

AI总结：

本文提出基于光梳锁定频率合成器的太赫兹频域光谱仪，实现5秒内覆盖>36GHz、分辨率优于20kHz的超高精度回音壁模式测量，并首次观察到不同模式族的微小红移与蓝移。

摘要：

我们展示了一种新型频域太赫兹光谱仪的能力，该光谱仪基于光梳锁定频率合成器，可提供绝对频率校准。扫描固有的稳定性和可重复性使快速数据采集与平均时间受限的信噪比相结合成为可能。我们在超高品质回音壁模式谐振器的太赫兹精密光谱中展示了千赫兹级频率分辨率。在5秒内获取覆盖多个自由光谱范围（>36GHz）且分辨率低于20kHz的光谱。我们分析了单个共振的耦合行为和温度调谐，并首次观察到不同模式族的微小红移和蓝移。实验结果得到有限元模拟的支持。

英文摘要：

We demonstrate the capabilities of a novel frequency-domain terahertz spectrometer based on a comb-locked frequency synthesizer, which provides absolute frequency calibration. The inherent stability and repeatability of the scans allow for the combination of fast data acquisition with an average time-limited signal-to-noise ratio. We demonstrate kilohertz level frequency resolution in terahertz precision spectroscopy of ultrahigh quality whispering-gallery-mode resonators. Spectra covering multiple free spectral ranges (>36GHz) with sub-20kHz resolution are acquired in 5s. We analyse the coupling behaviour and temperature tuning of single resonances and, for the first time, observe minute red and blue shifts of different mode families. The experimental results are supported with finite element simulations.

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