Comb-locked cavity ring-down saturation spectroscopy

Wang, J.; Sun, Yuxi; Tao, Lei-Gang; Liu, A.-W.; Hua, Tian-Peng; Meng, Fanqi; Hu, S.-M.

doi:10.1063/1.4980037

Cited by 33 publications

(26 citation statements)

References 45 publications

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“…It must be noted that the pressure-induced shift reported in the Doppler regime for a line of the same vibrational band, namely the P14e transition at 7183.388 97 cm −1 , was −1.996(4) kHz Pa −1 [21], which is far from the value reported in this paper. A similar mismatch has been already observed in a previous study on C 2 H 2 [14], and also for other molecules such as CO [28,29] and H 2 O [30,31].…”

Section: Resultssupporting

confidence: 89%

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

et al. 2021

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Doppler-free saturated-absorption Lamb dips are observed for weak vibration-rotation transitions of C2H2 between 7167 and 7217 cm−1, using a frequencycomb assisted cavity ring-down spectrometer based on the use of a pair of phase-locked diode lasers. We measured the absolute center frequency of sixteen lines belonging to the 2ν3 + ν15 band, targeting ortho and para states of the molecule. Line pairs of the P and Q branches were selected so as to form a “V”-scheme, sharing the lower energy level. Such a choice made it possible to determine the rotational energy separations of the excited vibrational state for J-values from 11 to 20. Line-center frequencies are determined with an overall uncertainty between 2 and 13 kHz. This is over three order of magnitude more accurate than previous experimental studies in the spectral region around the wavelength of 1.4 μm. The retrieved energy separations provide a stringent test of the so-called MARVEL method recently applied to acetylene.

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Section: Resultssupporting

confidence: 89%

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

et al. 2021

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“…Concurrently, the majority of wavenumber entries of line-by-line databases is based on less precise (mainly Doppler-limited) experiments, typically accurate to 10 −3 cm −1 . The application of precision-spectroscopy techniques, like Doppler-free cavityenhanced saturation spectroscopy referenced to optical frequency combs, brings a new perspective to the refinement of massive amounts of transitions, entering the kHz (10 −7 cm −1 ) regime [2][3][4][5] , and improving the accuracy of many lines and energy levels of molecular databases by orders of magnitude.…”

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confidence: 99%

Spectroscopic-network-assisted precision spectroscopy and its application to water

et al. 2020

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Frequency combs and cavity-enhanced optical techniques have revolutionized molecular spectroscopy: their combination allows recording saturated Doppler-free lines with ultrahigh precision. Network theory, based on the generalized Ritz principle, offers a powerful tool for the intelligent design and validation of such precision-spectroscopy experiments and the subsequent derivation of accurate energy differences. As a proof of concept, 156 carefullyselected near-infrared transitions are detected for H 2 16 O, a benchmark system of molecular spectroscopy, at kHz accuracy. These measurements, augmented with 28 extremelyaccurate literature lines to ensure overall connectivity, allow the precise determination of the lowest ortho-H 2 16 O energy, now set at 23.794 361 22(25) cm −1 , and 160 energy levels with similarly high accuracy. Based on the limited number of observed transitions, 1219 calibrationquality lines are obtained in a wide wavenumber interval, which can be used to improve spectroscopic databases and applied to frequency metrology, astrophysics, atmospheric sensing, and combustion chemistry.

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“…Sample pressures below 30 Pa were used for Lamb-dip measurements. The laser power used for spectral probing was about 15 mW and the intra-cavity laser power was estimated [26,27] to be about 200 W, leading to a saturation parameter of about 0.2% (maximum) with a laser beam waist radius of 0.5 mm. The spectrum recorded at a pressure of 2 Pa is shown in Fig.…”

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confidence: 99%

Toward a Determination of the Proton-Electron Mass Ratio from the Lamb-Dip Measurement of HD

Tao¹,

Liu²,

Pachucki³

et al. 2018

Phys. Rev. Lett.

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Precision spectroscopy of the hydrogen molecule is a test ground of quantum electrodynamics (QED), and it may serve for the determination of fundamental constants. Using a comb-locked cavity ring-down spectrometer, for the first time, we observed the Lamb-dip spectrum of the R(1) line in the overtone of hydrogen deuteride (HD). The line position was determined to be 217 105 182.79±0.03_{stat}±0.08_{syst} MHz (δν/ν=4×10^{-10}), which is the most accurate rovibrational transition ever measured in the ground electronic state of molecular hydrogen. Moreover, from calculations including QED effects up to the order m_{e}α^{6}, we obtained predictions for this R(1) line as well as for the HD dissociation energy, which are less accurate but signaling the importance of the complete treatment of nonadiabatic effects. Provided that the theoretical calculation reaches the same accuracy, the present measurement will lead to a determination of the proton-to-electron mass ratio with a precision of 1.3 parts per billion.

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Comb-locked cavity ring-down saturation spectroscopy

Cited by 33 publications

References 45 publications

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

Lamb-dip cavity ring-down spectroscopy of acetylene at 1.4 μm

Spectroscopic-network-assisted precision spectroscopy and its application to water

Toward a Determination of the Proton-Electron Mass Ratio from the Lamb-Dip Measurement of HD

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