Abstract
We report saturated-absorption spectra recorded by use of of infrared radiation coupled into a build-up cavity. Single-pass generation of difference-frequency radiation tunable near in a periodically poled crystal was used. Lamb dips of weak transitions of the fundamental rovibrational band of were observed, for what is believed to be the first time, up to the level. Application of these results to the extension of frequency-comb-based metrology in the infrared is discussed.
© 2002 Optical Society of America
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