Photonics Research, Volume. 10, Issue 8, 1803(2022)

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

Roberto Aiello1, Valentina Di Sarno1, Maria Giulia Delli Santi1, Maurizio De Rosa1,2, Iolanda Ricciardi1,2, Giovanni Giusfredi3, Paolo De Natale4, Luigi Santamaria5, and Pasquale Maddaloni1,2、*
Author Affiliations
  • 1Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
  • 2Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
  • 3ppqSense S.r.l., Via Gattinella 20, 50013 Campi Bisenzio, Italy
  • 4Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy
  • 5Agenzia Spaziale Italiana, Contrada Terlecchia, 75100 Matera, Italy
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    Figures & Tables(6)
    Sketch of the experimental setup.
    Comparison between Lamb-dip profiles of the C2H2 (ν1+ν3+ν4←ν4) R(14)e rovibrational transition, obtained by the CRD (upper frame) and SCAR (lower frame) fit of the cavity decay events, respectively, as a function of the gas pressure. In the SCAR case, an SNR as high as 110 is reached (for p=0.59 Pa).
    Linear fit (with intercept set to zero) to the y0(p) and γg(p) trends. While the CRD measurements obviously cannot give meaningful information on the linear absorption regime, the SCAR slope, although extracted in the sub-Pa range (even in the strong saturation regime), aligns with that determined at much higher pressures (between 1500 and 5000 Pa) by a simple (not cavity-enhanced) laser absorption spectrometer.
    Lamb-dip FWHMs provided by the SCAR and CRD analysis, respectively.
    SCAR line-center frequency determinations as a function of p. As mentioned in the text, the self-collisional shift coefficient could not be significantly estimated (by the slope of a linear fit): δself=(−3±6) kHz/Pa.
    • Table 1. Summary of Major Uncertainties Associated with the Absolute Determination of the Center Frequency of the C2H2(ν1+ν3+ν4ν4) R(14)e Rovibrational Transition for p=0.59  Pa

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      Table 1. Summary of Major Uncertainties Associated with the Absolute Determination of the Center Frequency of the C2H2(ν1+ν3+ν4ν4) R(14)e Rovibrational Transition for p=0.59  Pa

      ContributionUncertainty (kHz)
      Statistical1.2
      Pressure shift0.04
      GPS-based reference chain0.5
      Power shift0.2
      Second-order Doppler shift0.3
      Lamb-dip profile fit0.06
      Total1.4
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    Roberto Aiello, Valentina Di Sarno, Maria Giulia Delli Santi, Maurizio De Rosa, Iolanda Ricciardi, Giovanni Giusfredi, Paolo De Natale, Luigi Santamaria, Pasquale Maddaloni. Lamb-dip saturated-absorption cavity ring-down rovibrational molecular spectroscopy in the near-infrared[J]. Photonics Research, 2022, 10(8): 1803

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    Paper Information

    Category: Spectroscopy

    Received: Feb. 22, 2022

    Accepted: May. 10, 2022

    Published Online: Jul. 12, 2022

    The Author Email: Pasquale Maddaloni (pasquale.maddaloni@ino.cnr.it)

    DOI:10.1364/PRJ.456515

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