12 March 2013 Intracavity molecular spectroscopy in the mid-IR using ultra-broadband optical parametric oscillator
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We have performed intracavity molecular spectroscopy of water vapor, isotopic carbon dioxide, methane, acetylene, carbon monoxide, formaldehyde and other gases using broadband mid-IR sync-pumped OPO sources (PPLN-based OPO pumped by a femtosecond Er-fiber laser, or OP-GaAs-based OPO pumped by a femtosecond Tm-fiber laser) operating near degeneracy, with up to 2.5–6.1 μm instantaneous bandwidth. We found that the measured spectral line shapes may show dispersive features. The measured spectra were compared to a simple model, based on the intracavity round-trip dispersion, and excellent agreement between theory and measurements was found. Detection limits in the ppb-range were demonstrated.
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Magnus W. Haakestad, Magnus W. Haakestad, Tobias P. Lamour, Tobias P. Lamour, Nick Leindecker, Nick Leindecker, Alireza Marandi, Alireza Marandi, Konstantin L. Vodopyanov, Konstantin L. Vodopyanov, } "Intracavity molecular spectroscopy in the mid-IR using ultra-broadband optical parametric oscillator", Proc. SPIE 8604, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII, 86040T (12 March 2013); doi: 10.1117/12.2006122; https://doi.org/10.1117/12.2006122

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