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

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 ( ν 1 + ν 3 + ν 4 ←...

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Veröffentlicht in:Photonics research (Washington, DC) DC), 2022-08, Vol.10 (8), p.1803
Hauptverfasser: Aiello, Roberto, Di Sarno, Valentina, Santi, Maria Giulia Delli, De Rosa, Maurizio, Ricciardi, Iolanda, Giusfredi, Giovanni, De Natale, Paolo, Santamaria, Luigi, Maddaloni, Pasquale
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Sprache:eng
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Zusammenfassung: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 ( ν 1 + ν 3 + ν 4 ← ν 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 × 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%.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.456515