Chen Zaijun, Hänsch Theodor W, Picqué Nathalie
Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany;
Proc Natl Acad Sci U S A. 2019 Feb 26;116(9):3454-3459. doi: 10.1073/pnas.1819082116. Epub 2019 Feb 12.
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-µm 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.
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。频率梳的出现推动了精确分子光谱学的前沿发展。在此，我们展示了在分子中重要的3微米基本CH伸缩光谱区域，双梳光谱的实验相干时间超过半小时。使用两个频率梳的中红外傅里叶变换光谱，具有频率尺度的自校准、仪器线形对光谱轮廓的贡献可忽略不计、高信噪比和宽光谱带宽，为小分子的精密光谱学开辟了机会。可以设想对线形进行高度复用的计量。
