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: Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy; CNR, Ist Foton & Nanotecnol, I-20133 Milan, Italy; Univ Naples 2, Dipartimento Matemat & Fis, I-81100 Caserta, Italy; Univ Perpignan, Lab Math & Phys, F-66860 Perpignan, France; Ist Nazl Ottica, CNR INO, I-80078 Pozzuoli, NA, Italy; Ist Nazl Fis Nucl, I-50019 Sesto Fiorentino, FI, Italy; Ist Nazl Ottica, CNR INO, I-50125 Florence, 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

Journal/Review: JOURNAL OF CHEMICAL PHYSICS

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

More Information: We wish to acknowledge the financial support from the Italian Ministry of University and Research, FIRB under Project No. RBFR1006TZ.
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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