Abstract

We report on absolute measurements of saturated-absorption line-center frequencies of room-temperature trifluoromethane using a quantum cascade laser at 8.6 μm and the frequency modulation spectroscopy method. Absolute calibration of the laser frequency is obtained by direct comparison with a mid-infrared optical frequency comb synthesizer referenced to a radio-frequency Rb standard. Several sub-Doppler transitions falling in the υ5 vibrational band are investigated at around 1158.9  cm1 with a fractional frequency precision of 8.6·1012 at 1-s integration time, limited by the Rb-clock stability. The demonstrated frequency uncertainty of 6.6·1011 is mainly limited by the reproducibility of the frequency measurements.

© 2017 Optical Society of America

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