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

被引：3

作者：

Mueller, Sebastian ^{[1
,3
]}

Hill, Kane ^{[2
]}

Vogt, Dominik Walter ^{[2
,4
]}

Puppe, Thomas A. ^{[1
,4
]}

Mayzlin, Yuriy ^{[1
]}

Wilk, Rafal ^{[1
]}

机构：

[1] TOPT Photon AG, Lochhamer Schlag 19, D-82166 Munich, Germany

[2] Univ Auckland, Dept Phys, Auckland 1010, New Zealand

[3] Friedrich Alexander Univ, Inst Microwaves & Photon, Erlangen, Germany

[4] Te Whai Ao Dodd Walls Ctr Photon & Quantum Technol, Auckland, New Zealand

来源：

APL PHOTONICS | 2024年 / 9卷 / 07期

关键词：

SENSORS;

D O I：

10.1063/5.0217898

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

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 ultra-high quality whispering-gallery-mode resonators. Spectra covering multiple free spectral ranges (>36 GHz) with sub-20 kHz resolution are acquired in 5 s. We analyze the coupling behavior 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.

引用

页数：6

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