Mid-infrared feed-forward dual-comb spectroscopy
Mid-infrared feed-forward dual-comb spectroscopy
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DOI：
10.1073/pnas.1819082116
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发表时间：
2019-02-26
影响因子：
11.1
通讯作者：
Picque, Nathalie
中科院分区：
文献类型：
--
作者：
Chen, Zaijun;Haensch, Theodor W.;Picque, Nathalie
中红外高分辨率光谱已被证明是研究气相分子结构和动力学的宝贵工具。频率梳的出现推进了精确分子光谱学的前沿。在这里，我们证明，在重要的3-μ m光谱区域的基本CH拉伸分子，双梳光谱与实验的相干时间之间的梳，超过半小时。中红外傅里叶变换光谱学使用两个频率梳，具有频率标度的自校准、仪器线形对光谱轮廓的贡献可忽略、高信噪比和宽光谱带宽，为小分子的精确光谱学开辟了机会。可以设想线形的高度多路复用计量。
Mid-infrared high-resolution spectroscopy has proven an invaluable tool for the study of the structure and dynamics of molecules in the gas phase. The advent of frequency combs advances the frontiers of precise molecular spectroscopy. Here we demonstrate, in the important 3-mu m spectral region of the fundamental CH stretch in molecules, dual-comb spectroscopy with experimental coherence times between the combs that exceed half an hour. Mid-infrared Fourier transform spectroscopy using two frequency combs with self-calibration of the frequency scale, negligible contribution of the instrumental line shape to the spectral profiles, high signal-to-noise ratio, and broad spectral bandwidth opens up opportunities for precision spectroscopy of small molecules. Highly multiplexed metrology of line shapes may be envisioned.