Abstract

A simple method for absolute-frequency measurements of molecular transitions in the mid-IR region is reported. The method is based on a cw singly resonant optical parametric oscillator (SRO), which is tunable from 3.2 to $3.45\mathrm{\mu m}$. The mid-IR frequency of the SRO is referenced to an optical frequency comb through its pump and signal beams. Sub-Doppler spectroscopy and absolute-frequency measurement of the $P(7)$ transition of the ${\nu }_3$ band of ${\mathrm{CH}}_4$ are demonstrated.

© 2011 Optical Society of America

Frequency-comb-referenced mid-infrared source for high-precision spectroscopy

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