New Era of High Resolution Infrared Molecular Spectroscopy Opened by Optical Frequency Combs

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  • SASADA Hiroyuki
    Department of Physics, Faculty of Science and Technology, Keio University JST, ERATO Minoshima Intelligent Optical Synthesizer Project

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  • 光コムが拓く高分解能赤外分子分光の新時代
  • ヒカリ コム ガ ヒラク コウブンカイノウ セキガイ ブンシ ブンコウ ノ シン ジダイ

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Abstract

Optical frequency combs (OFCs) have greatly simplified optical frequency measurements with a 10‒11 relative uncertainty level. Sub-Doppler resolution spectroscopy, which resolves overlapped Dopplerbroadened spectral lines, gives the absolute frequencies of resolved transitions using OFCs. It has also been used as a spectroscopic source with a broad tunable range, a high accuracy of the frequency determination, and a short data acquisition time. For example, dual-comb spectroscopy has been applied to various fields such as the linear and nonlinear spectroscopy of atoms and molecules. We developed a comb-referenced sub-Doppler resolution infrared spectrometer and recently applied it to Stark spectroscopy of methane. Methane molecules are usually considered nonpolar, but small permanent electric dipole moments are induced by the vibrational and rotational motions. We recorded 20 transitions of the ν 3 band and accurately measured the Stark shifts. The electric dipole moments were precisely determined by considering the vibration-rotation interactions.

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