Skip to Main content Skip to Navigation

Spectroscopie adaptative à deux peignes de fréquences

Abstract : Dual-comb Fourier-transform spectroscopy takes advantage of an interferometer without moving parts. Interferences pattern between two femtosecond frequency combs, broadband laser sources whose spectra consist of evenly-spaced narrow lines, is measured. The measurement time and the spectral resolution are significantly improved compared to traditional Fourier spectrometers. However, the required short-term stability of the combs cannot be achieved by classic locking methods. Until now, no high-quality spectra could be recorded within a very short acquisition time. This thesis reports on the development of a real-time correction method able to compensate for the combs’ residual fluctuations and to restore non-distorted spectra. This analog technique does not require any locking system or a posteriori calculation. Its performance is demonstrated in the near-infrared (1.5 µm) and in the visible (520 nm) with fiber-based femtosecond lasers. Doppler-limited molecular spectra spanning 12 THz are measured within 500 µs. They are in excellent agreement with databases. For the first time, the full potential of dual-comb spectroscopy is demonstrated. The mid-infrared region is an attractive spectral range for molecular spectroscopy due to the molecules’ strong and characteristic absorptions. Therefore, extending dual-comb spectroscopy to this region is the next goal to achieve. Toward this goal, a comb emitting around 3 µm is characterized. It is based on the non-linear difference frequency generation from an erbium oscillator spectrally broadened with a highly non-linear fiber.
Complete list of metadata
Contributor : Abes Star :  Contact
Submitted on : Tuesday, August 20, 2013 - 9:32:12 AM
Last modification on : Wednesday, October 14, 2020 - 3:41:47 AM
Long-term archiving on: : Thursday, November 21, 2013 - 4:13:30 AM


Version validated by the jury (STAR)


  • HAL Id : tel-00852102, version 1



Antonin Poisson. Spectroscopie adaptative à deux peignes de fréquences. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112121⟩. ⟨tel-00852102⟩



Record views


Files downloads