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%% Sample TeX file for the HRMS Dijon 2023 abstracts
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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.

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\title{DEVELOPMENT OF AN OPTICAL FEEDBACK-CAVITY RING DOWN SPECTROMETER AT 8.5 $\mu m$. APPLICATION TO THE SELF CONTINUUM OF WATER VAPOR.}

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\author{\underline{\FirstName Q. \LastName FOURNIER},
  \FirstName S. \LastName KASSI,
\FirstName A. \LastName CAMPARGUE,
\FirstName H. \LastName FLEURBAEY,
\FirstName D. \LastName MONDELAIN}
\address{Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France}



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\author{\FirstName R. \LastName GEORGES}

\address{Institut de Physique de Rennes, UMR 6251 CNRS, Univ. de Rennes, Rennes, France}


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%% See http://www.tug.org/texlive/doc.html for a description of available packages.

%% The macros below will change the page head and foot.
%% Please, do not modify the content of the \fancyhead macro nor the \fancyfoot line.
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0.6pt}

%% The hyperref package allows to include hyperlinks in a document.
%% See the instructions for abstract submission for more details.
%% WARNING: Make sure that this package comes LAST since it re-defines many LaTeX macros.
\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {9,15}
\begin{document}

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

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%% Place the body of your abstract below.
The effective atmospheric absorption of the earth atmosphere within its 10 $\mu m$ transparency window is crucial for
radiative transfer calculations. The contribution of the water continuum in this region is still under discussion. The
proposal of an updated value at 1184 cm$^{-1}$ should increase the accuracy of the semi-empirical MTCKD model, which is
incorporated in radiative transfer codes. For this purpose, we used a newly developed spectrometer combining a quantum
cascade laser (QCL) with a high finesse linear cavity, working around 8.45 $\mu m$. This setup takes benefit of optical feedback
from an optical cavity and constitutes a Optical-Feedback-Cavity Ring Down Spectrometer (OF-CRDS). We will present
the behavior of the laser in such a configuration and demonstrate the sharpening of the QCL emission profile under optical
feedback from a TEM$_{00}$ resonant mode of a linear cavity. Absorption spectra are measured using the CRDS method, and
reach a sensitivity of 10$^{-8}$ cm$^{-1}$ per ring down event. Long-term performance will be presented. The spectral resolution,
governed by the free spectral range of the optical resonator, is about 300 MHz. The spectra are obtained by adjusting the
temperature of the QCL. Some already known water absorption lines were identified in the spectra, from 1183 cm$^{-1}$ and
1186 cm$^{-1}$ , and used for calibration. The broadband absorption of the water self-continuum is evaluated and will be
compared to the literature.




Acknowledgements: ANR FULLDIBS for financial support

\end{document}
