Frequency-comb-referenced molecular spectroscopy in the mid-infrared region |
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| Authors: | Vainio Markku Merimaa Mikko Halonen Lauri |
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| Affiliation: | Centre for Metrology and Accreditation (MIKES), P. O. Box 9, FIN-02151 Espoo, Finland. markku.vainio@helsinki.fi |
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| 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?μm. 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 ν3 band of CH4 are demonstrated. |
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