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31 January 2014 Massively-parallel intracavity trace molecular detection in the mid-infrared using broadband frequency combs
Konstantin Vodopyanov
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Proceedings Volume 8993, Quantum Sensing and Nanophotonic Devices XI; 899303 (2014) https://doi.org/10.1117/12.2030443
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
Ultrasensitive detection of methane, isotopic carbon dioxide, carbon monoxide, formaldehyde, acetylene and ethylene is performed in the spectral range 2.5 - 5 μm using intracavity spectroscopy inside a broadband optical parametric oscillator (OPO). The two separate OPOs were operated near degeneracy and were synchronously pumped either by a mode-locked erbium (1560 nm) or thulium (2050 nm) fiber laser. A large instantaneous bandwidth of up to 800 cm-1 allowed for simultaneous detection of several gases. We observed an effective path length enhancement due to coherent interaction inside the OPO cavity and achieve part-per-billion sensitivity levels.
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Konstantin Vodopyanov "Massively-parallel intracavity trace molecular detection in the mid-infrared using broadband frequency combs", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899303 (31 January 2014); https://doi.org/10.1117/12.2030443
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KEYWORDS
Optical parametric oscillators
Methane
Spectroscopy
Frequency combs
Absorption
Mid-IR
Carbon monoxide
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