12 March 2013 Intracavity molecular spectroscopy in the mid-IR using ultra-broadband optical parametric oscillator
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Proceedings Volume 8604, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII; 86040T (2013); doi: 10.1117/12.2006122
Event: SPIE LASE, 2013, San Francisco, California, United States
Abstract
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, Tobias P. Lamour, Nick Leindecker, Alireza Marandi, 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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KEYWORDS
Optical parametric oscillators

Absorption

Methane

Carbon monoxide

Mid-IR

Femtosecond phenomena

Molecular spectroscopy

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