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Title:MASSIVELY PARALLEL DETECTION OF TRACE MOLECULES AND ISOTOPOLOGUES WITH A SUBHARMONIC MID-IR DUAL COMB SYSTEM
Author(s):Vodopyanov, Konstantin L
Contributor(s):Loparo, Zachary E; Smolski, Viktor O; Muraviev, Andrey
Subject(s):Mini-symposium: Frequency-Comb Spectroscopy
Abstract:\begin{wrapfigure}{l}{0pt} \includegraphics[scale=0.3]{FIG_for_CLEO-2018_on_DCS_v2.eps} \end{wrapfigure} We use a pair of highly-coherent subharmonic GaAs optical parametric oscillators with an instantaneous span 3.1-5.5 $\mu$m to demonstrate fast acquisition of 350,000 mode-resolved spectral data points and perform parallel detection in a mixture of 22 molecular species including N$_{2}$O, NO, CO, OCS, CH$_{4}$, C$_{2}$H$_{6}$, C$_{2}$H$_{4}$, C$_{2}$H$_{2}$, CO$_{2}$, H$_{2}$O, and their isotopologues containing $^{33}$S, $^{34}$S, $^{13}$C, $^{15}$N, $^{18}$O, $^{17}$O, and $^{2}$H (deuterium) isotopes. We demonstrate all the benefits of the mid-IR dual-comb spectroscopy including broadband coverage, fast acquisition of massive spectral data, ppb-level sensitivity, comb-tooth resolved spectra (with finesse 4000) and absolute optical frequency referencing to atomic clock. We sampled molecular spectra with the comb-tooth spacing (115 MHz), however, thanks to the narrow comb teeth (3-kHz absolute and 25-mHz relative linewidth between the two combs), much higher spectral resolution can be obtained in the scanning comb-tooth resolved mode. The Figure shows: (a) schematic of the dual-comb setup, (b) log-scale optical spectrum retrieved from a single coherently-averaged interferogram with an evacuated multipass gas cell, and (c) when the cell was filled with a mixture of gases. The two spectra are vertically offset for clarity.
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/2142/100850
DOI:10.15278/isms.2018.TA03
Other Identifier(s):TA03
Date Available in IDEALS:2018-08-17
2018-12-12


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