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Description
Title: | Comb-locked Cavity Ring-down Spectroscopy For Molecular Transition Frequency Measurements Below 10−12 Relative Uncertainty |
Author(s): | Reed, Zachary |
Contributor(s): | Hodges, Joseph T.; Fleurbaey, Helene; Long, David A. |
Subject(s): | Mini-symposium: Precision Spectroscopy for Fundamental Physics |
Abstract: | The accurate determination of molecular transition frequencies can provide stringent tests and constraints on fundamental physics questions [1-3]. Here, we present recent work on a comb-locked cavity ring-down spectroscopy system which probes Doppler-broadened spectra in the linear absorption regime. These measurements have relative uncertainties in transition frequency below 10$^{-12}$, which are among the lowest values reported for optical molecular transition frequencies. We use a probe laser which is phase-locked to a commercial optical frequency comb and subsequently coupled to a high-finesse optical cavity based on that of [4]. We observe stationary measurement statistics for measurements of more than 2000 spectra and find that measurements which are replicated in multiple experiments over several months are normally distributed. Single-spectrum signal-to-noise-ratios can exceed 50,000:1, with resulting line center uncertainties below 5 kHz. Because this method is based on linear absorption, it is an attractive alternative for the measurement of molecular transitions that cannot be probed by saturation-based Doppler-free spectroscopy. Furthermore, we demonstrate results having smaller systematic errors than those provided by more complicated nonlinear spectroscopy methods. [1] F. M. J. Cozijn et. al. Phys. Rev. Lett. 120, 153002 (2018). [2] H. Fleurbaey et. al. Phys. Rev. Lett. 120, 183001 (2018). [3] J. Baron et. al. Science 343, 269-272 (2014). [4] H. Lin et. al. J. Quant. Spectros. and Rad. Trans. 161, 11-20 (2015) |
Issue Date: | 2021-06-23 |
Publisher: | International Symposium on Molecular Spectroscopy |
Genre: | Conference Paper / Presentation |
Type: | Text |
Language: | English |
URI: | http://hdl.handle.net/2142/111078 |
DOI: | 10.15278/isms.2021.WI13 |
Date Available in IDEALS: | 2021-09-24 2022-01-21 |