Feasibility of dual comb spectroscopy in the UV range using a free-running, bidirectional ring titanium sapphire laser

Abel Feuvrier (1, 2) , Clément Pivard (1, 2) , Jérôme Morville (1, 2) , Patrick Rairoux (1, 2) , Sandrine Galtier (1, 2)

1 ILM - Institut Lumière Matière [Villeurbanne]
2 iLM - ATMOS - iLM - Atmosphère, Optique et Spectroscopie

We show that our developed free-running, bidirectional ring Ti:Sa laser cavity meets the requirements for Dual Comb Spectroscopy in the UV range (UV-DCS). Two counter-propagative frequency combs with slightly different repetition rate are generated in such a cavity and we show quantitatively that this repetition rate difference can be explained by the self-steepening effect. Molecular absorption lines of the O2 A -band centered around 760~nm are measured with a 1,5 GHz spectral resolution, demonstrating that the mutual coherence of the two combs allows GHz-resolution DCS measurements. Moreover, we demonstrate that the generated output peak power allows for efficient second harmonic generation (SHG), in the scope of developing laboratory and open-path UV-DCS experiments.

Mots clés: Spectroscopy; Laser femtosecond; Dual Comb Spectroscopy; Titanium sapphire laser; UV frequency comb

Domaines: Physique [physics]

Abel Feuvrier, Clément Pivard, Jérôme Morville, Patrick Rairoux, Sandrine Galtier. Feasibility of dual comb spectroscopy in the UV range using a free-running, bidirectional ring titanium sapphire laser. European Optical Society Annual Meeting, Sep 2023, DIJON, France. pp.07019, ⟨10.1051/epjconf/202328707019⟩. ⟨hal-04415362⟩