M. Wienold, T. Alam, L. Schrottke, H. T. Grahn, and H.-W. Hübers
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-6-6692
We report on the Doppler-free saturation spectroscopy of a molecular transition at 3.3 THz based on a quantum-cascade laser and an absorption cell in a collinear pump-probe configuration. A Lamb dip with a sub-Doppler linewidth of 170 kHz is observed for a rotational transition of HDO. We found that a certain level of external optical feedback is tolerable as long as the free spectral range of the external cavity is large compared to the width of the absorption line.
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