Lamb-dip saturated-absorption cavity ring-down rovibrational molecular spectroscopy in the near-infrared

Year: 2022

Authors: Aiello R., Di Sarno V., Santi MGD., De Rosa M., Ricciardi I., Giusfredi G., De Natale P., Santamaria L., Maddaloni P.

Autors Affiliation: Ist Nazl Ottica, Consiglio Nazl Ric, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy; Ist Nazl Fis Nucl, Sez Napoli, Complesso Univ MS Angelo,Via Cintia, I-80126 Naples, Italy; PpqSense Srl, Via Gattinella 20, I-50013 Campi Bisenzio, Italy; Ist Nazl Ottica, Consiglio Nazl Ric, Largo E Fermi 6, I-50125 Florence, Italy; Agenzia Spaziale Italians, Contrada Terlecchia, I-75100 Matera, Italy.

Abstract: The high-detection-sensitivity saturated-absorption cavity ring-down (SCAR) technique is extended to Lamb-dip spectroscopy of rovibrational molecular transitions in the near-infrared region. Frequency-comb-referenced sub-Doppler saturation measurements, performed on the acetylene (nu(1) + nu(3) + nu(4) <- nu(4)) R(14)e line at 6562 cm(-1), are analyzed by a SCAR global line profile fitting routine, based on a specially developed theoretical model. Compared to a conventional cavity ring-down evaluation, our approach yields dip profiles with a linewidth freed from saturation broadening effects, reduced by 40%, and a signal-to-noise ratio increased by 90%. Ultimately, an overall (statistical and systematic) fractional uncertainty as low as 7 x 10(-12) is achieved for the absolute line-center frequency. At the same time, our method is also able to accurately infer the linear (non-saturated) behavior of the gas absorption, providing Lamb-dip-based line strength measurements with a relative uncertainty of 0.5%. (C) 2022 Chinese Laser Press Journal/Review: PHOTONICS RESEARCH

Volume: 10 (8)      Pages from: 1803  to: 1809

KeyWords: Radiocarbon Dioxide
DOI: 10.1364/PRJ.456515

Citations: 9
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