Frequency stable and low phase noise THz synthesis for precision spectroscopy

Léo Djevahirdjian (), Loïc Lechevallier (), Marie-Aline Martin-Drumel (), Olivier Pirali (), Guillaume Ducournau (), Rédha Kassi () and Samir Kassi ()
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Léo Djevahirdjian: Univ. Grenoble Alpes, CNRS, LIPhy
Loïc Lechevallier: Univ. Grenoble Alpes, CNRS, LIPhy
Marie-Aline Martin-Drumel: Institut des Sciences Moléculaires d’Orsay
Olivier Pirali: Institut des Sciences Moléculaires d’Orsay
Guillaume Ducournau: UMR 8520 IEMN, Institut d’Electronique de Microélectronique et de Nanotechnologie
Rédha Kassi: UMR 8520 IEMN, Institut d’Electronique de Microélectronique et de Nanotechnologie
Samir Kassi: Univ. Grenoble Alpes, CNRS, LIPhy

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract We present a robust approach to generate a continuously tunable, low phase noise, Hz linewidth and mHz/s stability THz emission in the 0.1 THz to 1.4 THz range. This is achieved by photomixing two commercial telecom, distributed feedback lasers locked by optical-feedback onto a single highly stable V-shaped optical cavity. The phase noise is evaluated up to 1.2 THz, demonstrating Hz-level linewidth. To illustrate the spectral performances and agility of the source, low pressure absorption lines of methanol and water vapors have been recorded up to 1.4 THz. In addition, the hyperfine structure of a water line at 556.9 GHz, obtained by saturation spectroscopy, is also reported, resolving spectral features displaying a full-width at half-maximum of 10 kHz. The present results unambiguously establish the performances of this source for ultra-high resolution molecular physics.

Date: 2023
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DOI: 10.1038/s41467-023-42905-z

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