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\documentclass[11pt]{article}

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

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\title{NEW PERSPECTIVES FOR THZ WATER LASER USING QCL OPTICAL PUMPING}

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\author{\underline{\FirstName L. \LastName JUPPET},
  \FirstName O. \LastName PIRALI}
\address{Institut des Sciences Mol\'eculaires d'Orsay, CNRS, Universit\'e Paris-Saclay, 91405 Orsay, France}

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\author{\FirstName J. F. \LastName LAMPIN,
  \FirstName A. \LastName KHABBAZ}
\address{Institut d'Electronique Micro\'electronique et Nanotechnologie (IEMN), CNRS, Universit\'e de Lille, F-59652 Villeneuve d'Ascq Cedex, France}

\author{\FirstName G. \LastName MOURET}
\address{Universit\'e du Littoral C\^ote d'Opale (LPCA), F-59140 Dunkerque, 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]{}
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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.
Laboratory astrophysics and molecular spectroscopy are among the most demanding applications for coherent, intense, and tunable continuous wave (CW) THz radiation (0.3 -- 10 THz). Such THz source is still lacking despite the continuous efforts of specialized teams and the various approaches developed in the last decades (see e.g Ref\footnote{J. C. Pearson and al, IEEE \textit{Journal of Microwaves} \textbf{1} 43 (2021)} for a review on the subject). The recent demonstration of efficient optical pumping using highly tunable quantum cascade lasers (QCL) renewed the interest for THz molecular lasers \footnote{A. Pagies and al, \textit{APL Photonics} (2016)}$^,$\footnote{M. Wienold and al, \textit{Optics Express} \textbf{28} (2020)}$^,$\footnote{P. Chevalier and al, \textit{Applied Physics Letters} \textbf{120} (2022)}. Moreover, some of us recently demonstrated the recording of several absorption lines of methanol, at sub-MHz resolution in the 1--3.3 THz, range by heterodyne mixing of the THz continuum extracted by the AILES beamline of SOLEIL synchrotron with the laser lines produced by a QCL-based optically pumped molecular laser\footnote{J. F. Lampin and al, \textit{Optics Letters} \textbf{44} (2019)}$^,$\footnote{T. S. Hearne and al, \textit{Optics Express} \textbf{30} (2022)} acting as the THz local oscillator. To extend such heterodyne mixing experiments to various molecular systems, it is mandatory to generate new lists of THz laser frequencies using the great opportunities offered by QCL optical pumping. In this work, we investigate the use of the water molecule (H$_2$O and its isotopologue of same symmetry, D$_2$O) as a gain medium for a THz molecular laser pumped by a mid-IR QCL. Indeed, within its firsts vibrational states, water presents dense and intense pure rotational spectra covering the 0.5--10 THz spectral range, making this molecule an interesting candidate for the heterodyne set-up for high resolution spectroscopy. This spectroscopic method as well as results obtained with THz water laser as a local oscillator will also be presented.


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