Abstract
High-precision cavity-enhanced spectroscopic measurements are commonly compromised by interferences caused by external etalons. Here, we present the differential cavity ring-down spectroscopy (D-CRDS) technique for reducing these perturbations. We discuss how etalons are caused by coupled-cavity interactions between the primary ring-down cavity and other optical elements of the experiment, and we model and experimentally verify how drift in cavity base loss correlates with barometric pressure and laboratory temperature. D-CRDS measurements of near-infrared spectra that are insensitive to etalon-induced distortions are then presented. Based on an average of spectra, these results yield a signal-to-noise ratio of and a minimum detectable absorption coefficient of .
© 2013 Optical Society of America
Full Article | PDF ArticleMore Like This
Zhen Wang, Zhimin Peng, Yanjun Ding, and Yanjun Du
J. Opt. Soc. Am. B 37(4) 1144-1152 (2020)
Y. R. Sun, H. Pan, C.-F. Cheng, A.-W. Liu, J.-T. Zhang, and S.-M. Hu
Opt. Express 19(21) 19993-20002 (2011)
Ignacio E. Olivares
J. Opt. Soc. Am. B 30(4) 945-949 (2013)