Data set related to the preprint R. Chell et al. "An overlooked detector response limits the accuracy of cavity ring-down spectroscopy" (2026).
Link to related preprint on ArXiv: https://arxiv.org/abs/2609.04027
DOI: 10.48550/arXiv.2609.04027
The data is available under a CC BY 4.0 license.
Raw spectroscopic data for the R(23) line of the 3–0 band of CO were acquired in 2023 at a temperature of 296 K and a pressure of 0.67 kPa using a cavity-enhanced experimental setup enabling the simultaneous implementation of cavity ring-down spectroscopy (CRDS) and cavity mode-dispersion spectroscopy (CMDS). Absolute optical and radio-frequency (RF) frequencies were referenced to an optical frequency comb.
The ring-down signals recorded across the CO absorption line using CRDS were analysed by fitting an exponential decay function convolved with the instrumental response function of the detection system - TF-CRDS approach. The transfer function of the detection system was determined without external calibration using the beat-note method.
The dataset was deposited in 2026.
Deposited data:
Data_Fig3 – This file contains the measured and fitted transfer functions of the detection system for detector configurations D2 and D4, as well as raw data for the cavity mode width and ring-down signals measured within the R(23) line of the 3–0 band of CO, for time constants of approximately 4 µs and 32 µs. These data were used to generate Fig. 3 in the related paper.
Data_Fig4 – This file contains raw data for the CRDS absorption spectrum of the R(23) line of the 3–0 band of CO and the corresponding TF-CRDS spectrum obtained after correction using the transfer function of the detection system, for detector configurations D4 and D2, respectively. For each configuration, the relative bias of the TF-CRDS time constants with respect to the corresponding CRDS time constants is also provided. These data were used to generate Fig. 4 in the related paper.
Data_Fig5 – This file contains the relative ratios of the integrated line areas of the R(23) line of the 3–0 band of CO obtained using CRDS and TF-CRDS, together with the corresponding uncertainties. These data were used to generate Fig. 5 in the related paper.
