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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.
\usepackage{amsmath}
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\title{DUAL-COMB SPECTROSCOPY IN THE TWO-MICRON RANGE USING A NOVEL DESIGN OF DISPERSION-CONTROLLED HIGHLY NONLINEAR FIBRE}

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\author{\underline{\FirstName A. \LastName MALFONDET}, \FirstName M. \LastName DEROH, \FirstName G. \LastName MILLOT}
\address{ICB, Universit\'{e} de Bourgogne, CNRS UMR 6303, F-21078 Dijon, France,}

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\author{\FirstName S.-E. \LastName AHMEDOU,  \FirstName R. \LastName DAULIAT, \FirstName P. \LastName ROY, \FirstName R. \LastName JAMIER}
\address{Universit\'{e} de Limoges, CNRS, XLIM, UMR 7552, F-87000 Limoges, France}

\author{\FirstName A. \LastName PARRIAUX}
\address{Laboratoire Temps-Fr\'{e}quence, Institut de Physique, Universit\'{e} de Neuch\^{a}tel, Avenue de Bellevaux 51, 2000 Neuch\^{a}tel, Switzerland}


\author{\FirstName L. \LastName LABONTE, \FirstName S. \LastName TANZILLI}
\address{Univ. C\^{o}te d'Azur, CNRS, Institut de Physique de Nice, F-06108 Nice Cedex 2, France}


\author{\FirstName J.-C. \LastName DELAGNES}
\address{CELIA, Centre Laser Intenses et Applications, Universit\'{e} de Bordeaux-CNRS-CEA, UMR 5107, F-33405 Talence Cedex France}



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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {3,15}
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\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

Over the past few decades, dual-comb spectroscopy (DCS) has garnered significant interest due to its ability to enable precise and real-time gas detection \footnote{G. Millot \textit{et al.}, "Frequency-agile dual-comb spectroscopy", Nature Photonics, 10, 27 (2016)}. This technique finds applications in various fields such as breath analysis, air pollutant detection, agricultural gas flux measurement, or material characterization to cite a few. Moreover, the availability of mature components operating at 1.55 $\mu$m has greatly facilitated the development of spectrometers based on DCS. However, certain molecular species, like $\text{CO}_2$, exhibit a very low absorption in this spectral window, necessitating long absorption lengths to detect them effectively. Hence, there is a need to convert the frequency combs to a more suitable spectral window, preferably around 2 $\mu$m or beyond, to combine the component maturity at 1.55 $\mu$m with efficient absorption in the mid-infrared region.

In this study, we employ the phenomenon of degenerate four-wave mixing \footnote{S. Pitois \textit{et al..}, "Experimental observation of a new modulation instability spectral window induced by fourth-order dispersion in a normally dispersive single-mode optical fiber", Optics Communications, 226,415-422 (2003)} in a specially designed dispersion-controlled highly nonlinear fiber to convert our frequency combs in the two-micron region \footnote{S.E. Ahmedou \textit{et al.}, "Design and fabrication of dispersion controlled highly nonlinear fibers for far-detuned four-wave mixing frequency conversion",Optics Express, 30, 6 (2023)}. This approach enables us to measure the rotational-vibrational absorptions of $^{12}\text{C}^{16}\text{O}_2$ and $^{14}\text{N}_2 ^{16}\text{O}$ and extract the self-broadening coefficients associated with these molecules. A study is also performed on a mixture $^{12}\text{C}^{16}\text{O}_2$/$^{14}\text{N}_2 ^{16}\text{O}$, in order to measure the broadening of the $\text{CO}_2$ peaks due to the presence of $\text{N}_2 \text{O}$. Our results are in very good agreement with the HITRAN database, showing the performance of the proposed dual-comb spectrometer.


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