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\documentclass[11pt]{article}

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

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\title{FREQUENCY STABLE AND LOW PHASE NOISE THZ GENERATION FOR PRECISION SPECTROSCOPY}

%% Note that \author and \address macros must be paired.
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\author{\underline{\FirstName L. \LastName LECHEVALLIER},
\FirstName L. \LastName DJEVAHIRDJIAN,
\FirstName S. \LastName KASSI}

\address{Univ. Grenoble Alpes, CNRS, LIPhy, Grenoble, France}

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\author{\FirstName M. A. \LastName MARTIN-DRUMEL,
\FirstName O. \LastName PIRALI}
\address{Univ., CNRS, Institut des Sciences Mol\'eculaires d\textquotesingle Orsay, Orsay, France}

\author{\FirstName G. \LastName DUCOURNAU,
\FirstName R. \LastName KASSI}
\address{Univ. Lille 1, CNRS, Institut d\textquotesingle Electronique, de Micro\'electronique et de Nanotechnologie, Villeneuve d\textquotesingle Ascq, France}

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\usepackage{fancyhdr}
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\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.
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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {15,4}
\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 terahertz (THz) region offers new possibilities for accurate characterization of light molecules\footnote{\href{https://www.researchgate.net/publication/222402899_The_submillimeter_A_spectroscopist's_view}{10.1016/j.jms.2010.01.002}, Lucia, Frank, The submillimeter: A spectroscopist\textquotesingle s view, Journal of Molecular Spectroscopy, \textbf{261}, 1-17, (2010).}
as well as the low lying vibrational modes of heavier ones\footnote{\href{https://pubs.rsc.org/en/content/articlelanding/2013/CP/c3cp44305a}{10.1039/C3CP44305A}, Pirali, O. and Goubet, M. and Huet, T. R. and Georges, R. and Soulard, P. and Asselin, P. and Courbe, J. and Roy, P. and Vervloet, M., The far infrared spectrum of naphthalene characterized by high resolution synchrotron FTIR spectroscopy and anharmonic DFT calculations, The Royal Society of Chemistry, \textbf{15}, 10141-10150, (2013).}.
High resolution molecular spectroscopy requires sub-KHz and very stable sources to typically resolve sub-Doppler features. Unfortunately, current high resolution THz spectrometers remain rather complex and/or cover limited spectral ranges necessitating fastidious experimental adjustments\footnote{\href{https://www.researchgate.net/publication/318687597_Terahertz_Frequency_Metrology_for_Spectroscopic_Applications_a_Review}{10.1007/s10762-017-0406-x}, Consolino, Luigi and Bartalini, Saverio and Natale, P., Terahertz Frequency Metrology for Spectroscopic Applications: a Review, Journal of Infrared, Millimeter, and Terahertz Waves, \textbf{38}, (2017).}\footnote{\href{https://ieeexplore.ieee.org/document/9318754}{10.1109/JMW.2020.3032454}, John C. Pearson and Brian J. Drouin and Shanshan Yu, Instrumentation for THz Spectroscopy in the Laboratory and in Space, IEEE Journal of Microwaves, \textbf{1}, 43-54, (2021).}.
We recently developed an efficient system that generates a low phase noise, continuously tunable THz signal. It achieves Hz linewidth and mHz/s stability by locking two commercial distributed feedback (DFB) lasers, using optical feedback technique, onto a common highly stable V-shaped optical cavity. The photomixing of the lasers is achieved using a commercial photomixer that emits a collimated THz radiation. A Mach-Zehnder modulator provides fine frequency tuning by adding or subtracting a Radio-Frequency (RF) frequency to one of the DFB lasers. To illustrate the performances and the agility of the instrument we will present phase noise measurements results and spectroscopic applications on absorption lines of methanol and water vapours up to 1.4 THz including a recording of hyperfine structure of water line at 556.9 GHz, obtained by saturation spectroscopy.


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