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 Title: BROADBAND CAVITY-ENHANCED MOLECULAR ABSORPTION AND DISPERSION SPECTROSCOPY WITH A FREQUENCY COMB-BASED VIPA SPECTROMETER Author(s): Charczun, Dominik Contributor(s): Maslowski, Piotr; Lisak, Daniel; Trawiński, Ryszard S.; Cygan, Agata; Kowzan, Grzegorz Subject(s): Mini-symposium: Frequency-Comb Spectroscopy Abstract: Cavity mode-width spectroscopy (CMWS)~[1] and cavity mode-dispersion spectroscopy (CMDS)~[2] techniques provide a way to simultaneously determine absorption and dispersion of a sample in an optical cavity. It was shown recently that CMDS can also be efficiently combined with optical frequency combs (OFCs)~[3] to perform dispersion measurements in a broad spectral range. In this work, we utilize a near-infrared frequency comb and a VIPA spectrometer to retrieve absorption and dispersion of an atmospheric pressure CO-N$_2$ sample in a high-finesse cavity, by measuring shapes and positions of 7-kHz-wide cavity modes at Hz-level precision. A Pound-Drever-Hall lock of a CW \begin{wrapfigure}{r}{0pt} \includegraphics[scale=1.0]{single_cavity_mode.eps} \end{wrapfigure} laser to the cavity and a phase-lock of the OFC to the CW laser allow for arbitrary detuning between comb and cavity modes, while cavity length stabilization to a Rb frequency standard provides absolute frequency scale. The signal-to-noise ratios for CMWS and CMDS spectra were, respectively, 190 and 380. To the best of our knowledge, the 7-kHz-wide cavity resonances shown in this work are the narrowest spectral features measured directly with a frequency comb. The presented technique is capable of fast acquisition and ultrahigh resolution in a broad spectral range, which makes it particularly suitable for spectroscopy of cold molecules or monitoring of chemical kinetics.\vspace{1em} \noindent [1] A. Cygan \textit{et al}, Opt. Express 21, 29744 (2013).\\{} [2] A. Cygan \textit{et al}, Opt. Express 23, 14472 (2015).\\{} [3] L. Rutkowski \textit{et al}, Opt. Express 25, 21711–21718 (2017). Issue Date: 06/19/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100524 DOI: 10.15278/isms.2018.TG10 Other Identifier(s): TG10 Date Available in IDEALS: 2018-08-172018-12-12
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