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Frequency-comb-referenced mid-infrared source for high-precision spectroscopy. | LitMetric
We report on a tunable continuous-wave mid-infrared optical parametric oscillator (OPO), which is locked to a fully stabilized near-infrared optical frequency comb using a frequency doubling scheme. The OPO is used for 40 GHz mode-hop-free, frequency-comb-locked scans in the wavelength region between 2.7 and 3.4 μm. We demonstrate the applicability of the method to high-precision cavity-ring-down spectroscopy of nitrous oxide (NO) and water (HO) at 2.85 µm and of methane (CH) at 3.2 μm.
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