Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe
Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe
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DOI：
10.1103/physrevlett.126.063001
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发表时间：
2021-02-11
影响因子：
8.6
通讯作者：
Lehmann, Kevin K.
中科院分区：
文献类型：
--
作者：
Foltynowicz, Aleksandra;Rutkowski, Lucile;Lehmann, Kevin K.
本文首次报道了利用频率梳作为光-光双共振光谱探针测量亚多普勒分子响应。我们使用一个3.3 μ m的连续波泵和1.67 μ m的梳状探头，以类似于1.7 MHz的中心频率精度检测亚多普勒过渡到2 NU（3）和3 NU（3）的甲烷频带。这些测量首次验证了高度振动激发态理论预测的准确性，这是模拟系外行星高温光谱所需的。到3 nu（3）波段的跃迁频率与TheoReTS谱线表显示出良好的一致性。
We report the first measurement of sub-Doppler molecular response using a frequency comb by employing the comb as a probe in optical-optical double-resonance spectroscopy. We use a 3.3 mu m continuous wave pump and a 1.67 mu m comb probe to detect sub-Doppler transitions to the 2 nu(3) and 3 nu(3) bands of methane with similar to 1.7 MHz center frequency accuracy. These measurements provide the first verification of the accuracy of theoretical predictions from highly vibrationally excited states, needed to model the high-temperature spectra of exoplanets. Transition frequencies to the 3 nu(3) band show good agreement with the TheoReTS line list.