Comb-locked cavity ring-down saturation spectroscopy

We present a new method of comb-locked cavity ring-down spectroscopy for the Lamb-dip measurement of molecular ro-vibrational transitions. By locking both the probe laser frequency and a temperature-stabilized high-finesse cavity to an optical frequency comb, we realize saturation spectroscopy of mo...

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Veröffentlicht in:Review of scientific instruments 2017-04, Vol.88 (4), p.043108-043108
Hauptverfasser: Wang, J., Sun, Y. R., Tao, L.-G., Liu, A.-W., Hua, T.-P., Meng, F., Hu, S.-M.
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Sprache:eng
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Zusammenfassung:We present a new method of comb-locked cavity ring-down spectroscopy for the Lamb-dip measurement of molecular ro-vibrational transitions. By locking both the probe laser frequency and a temperature-stabilized high-finesse cavity to an optical frequency comb, we realize saturation spectroscopy of molecules with kilohertz accuracy. The technique is demonstrated by recording the R(9) line in the υ = 3 − 0 overtone band of CO near 1567 nm. The Lamb-dip spectrum of such a weak line (transition rate 0.0075 s−1) is obtained using an input laser power of only 3 mW, and the position is determined to be 191 360 212 770 kHz with an uncertainty of 7 kHz ( δ ν / ν ∼ 3.5 × 10 − 11 ), which is currently limited by our rubidium clock.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4980037