A CW CO
2 laser oscillates at the wavelength range of 9-11μm, where various molecules have the fundamental vibrational band. In our laboratory, a widely tunable CO
2 laser sideband system has been developed for high-resolution spectroscopy and applied to a microwave (MW)-infrared (IR) double resonance spectrometer and a Starkmodulated sub-Doppler resolution spectrometer. The present article reports operation principles, features, and practical techniques of the CO
2 laser sideband system and application to high-resolution spectroscopy of methanol. The results show high performance of the CO
2 laser sideband system for studying molecular spectroscopy.
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