26ème Congrès Général de la SFP

Mid-IR laser frequency control with a comb: application to HCOOH spectroscopy and H2+ spectroscopy at the sub ppt level

Non programmé

20m

Centre des Congrès de la Villette (Cité des sciences et de l'Industrie, Paris)

Poster MC5 Physico-chimie des environnements atomiques et moléculaires froids et ultra froids Session Poster 1: MC3, MC5, MC6, MC11, MC13, MC15, MC16, MC18, MC19, MC25, REDP, posters hors MC

Orateur

Prof. Laurent Hilico (Laboratoire Kastler Brossel - Université d'Evry Val d'Essonne)

Description

Laboratoire Kastler Brossel, Sorbonne Université, ENS, CNRS ; 4 place Jussieu, Case 74, 75005 Paris, France
Département de Physique, Univ EVRY Université Paris Saclay, rue du père André Jarlan, 91025 Evry, France

The work presented in this poster focusses on the stabilisation of a mid-IR laser against a frequency comb which is optically locked to the ultrastable REFIMEVE signal and on first tests performed on formic acid (HCOOH) by saturation spectroscopy.
The poster first presents the laser stabilization signals (laser beam management, sum frequency efficiency, comb to comb beatnote characteristics), laser phase lock loops and resulting stability properties.

The poster also presents recent HCOOH optical frequency measurements at 9.166 µm with a detailled lineshape analysis. Systematic effect analysis allows to extract relevant line parameters (line center, light shifts, pressure shifts, modulation shifts, as well as pressure and power broadening) and show the spectrometer has a sub ppt (10 12) resolution.
The poster also discusses the application to state selected cold H2+ molecular ion spectroscopy.