Scientific Results

Tracing part-per-billion line shifts with direct-frequency-comb Vernier spectroscopy

Year: 2015

Authors: Siciliani de Cumis M., Eramo R., Coluccelli N., Cassinerio M., Galzerano G. , Laporta P. , De Natale P. , Cancio Pastor P.

Autors Affiliation: Istituto Nazionale di Ottica-CNR and European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, Sesto Fiorentino, Italy; Dipartimento di Fisica-Politecnico di Milano and Istituto di Fotonica e Nanotecnologie-CNR, Piazza Leonardo da Vinci 32, Milano, Italy

Abstract: Accurate frequency measurements of molecular transitions around 2 mu m are performed by using a direct-frequency-comb spectroscopy approach that combines an Er+ frequency-comb oscillator at 1.5 mu m, a Tm-Ho fiber amplifier, and a Fabry-Perot-filter, high-resolution dispersive spectrometer optical multiplex-detection system. This apparatus has unique performances in terms of a wide dynamic range to integrate the intensity per comb mode, which allows one to measure molecular absorption profiles with high precision. Spectroscopic information about transition frequencies and linewidths is very accurately determined. Relative frequency uncertainties of the order of a few parts in 10(-9) are achieved for rovibrational transitions of the CO2 molecule around 5100 cm(-1). Moreover, tiny frequency shifts due to molecular collisions and interacting laser power using direct comb spectroscopy are investigated in a systematic way.

Journal/Review: PHYSICAL REVIEW A

Volume: 91 (1)      Pages from: 012505  to: 012505

More Information: This work was supported by the Italian Ministry of University and Research, Extreme Light Infrastructure-Italy (ELI-Italy) project, and Progetti di Ricerca di Interesse Nazionale (PRIN), Project No. 2008H9F3ZY.
KeyWords: Fabry-Perot interferometers; Fiber amplifiers, Dispersive spectrometers; Frequency comb spectroscopies; Frequency measurements; Molecular transitions; Relative frequencies; Rovibrational transitions; Spectroscopic information; Transition frequencies, Spectrometers
DOI: 10.1103/PhysRevA.91.012505

Citations: 11
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