Frequency-comb-assisted precision laser spectroscopy of CHF3 around 8.6 mu m

Year: 2015

Authors: Gambetta A., Coluccelli N., Cassinerio M., Fernandez T.T., Gatti D., Castrillo A., Ceausu-Velcescu A., Fasci E., Gianfrani L., Santamaria L., Di Sarno V., Maddaloni P., De Natale P., Laporta P., Galzerano G.

Autors Affiliation: Dipartimento di Fisica – Politecnico di Milano and Istituto di Fotonica e Nanotecnologie – CNR, Piazza Leonardo da Vinci 32, Milano, 20133, Italy; Dipartimento di Matematica e Fisica – Seconda Università di Napoli, Viale Lincoln 5, Caserta, 81100, Italy; Laboratoire de Mathématiques et Physique, Université de Perpignan, Via Domitia EA 4217, Perpignan, F-66860, France; CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, Pozzuoli, NA, 80078, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Sez. Firenze, Via G. Sansone 1, Sesto Fiorentino, FI, 50019, Italy; CNR-INO, Istituto Nazionale di Ottica, Largo E. Fermi 6, Firenze, 50125, Italy

Abstract: We report a high-precision spectroscopic study of room-temperature trifluoromethane around 8.6 μm, using a CW quantum cascade laser phase-locked to a mid-infrared optical frequency comb. This latter is generated by a nonlinear down-conversion process starting from a dual-branch Er:fiber laser and is stabilized against a GPS-disciplined rubidium clock. By tuning the comb repetition frequency, several transitions falling in the υ5 vibrational band are recorded with a frequency resolution of 20 kHz. Due to the very dense spectra, a special multiple-line fitting code, involving a Voigt profile, is developed for data analysis. The combination of the adopted experimental approach and survey procedure leads to fractional accuracy levels in the determination of line center frequencies, down to 2 × 10-10. Line intensity factors, pressure broadening, and shifting parameters are also provided. © 2015 AIP Publishing LLC


Volume: 143 (23)      Pages from: 234202-1  to: 234202-6

KeyWords: Fiber lasers; Laser spectroscopy; Quantum cascade lasers; Spectroscopic analysis, Experimental approaches; Frequency resolutions; Line intensities; Optical frequency combs; Pressure-broadening; Repetition frequency; Spectroscopic studies; Vibrational bands, Laser mode locking
DOI: 10.1063/1.4937424

Citations: 9
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