Intracavity trace molecular detection with a broadband mid-IR frequency comb source

Author
Haakestad, Magnus Willum
Lamour, Tobias P.
Leindecker, Nick
Marandi, Alireza
Vodopyanov, Konstantin L.
Date Issued
2013
Keywords
Spektroskopi
Gass
Deteksjon
Permalink
http://hdl.handle.net/20.500.12242/810
https://publications.ffi.no/123456789/810
DOI
10.1364/JOSAB.30.000631
Collection
Articles
Description
Haakestad, Magnus Willum; Lamour, Tobias P.; Leindecker, Nick; Marandi, Alireza; Vodopyanov, Konstantin L.. Intracavity trace molecular detection with a broadband mid-IR frequency comb source. Journal of the Optical Society of America. B, Optical physics 2013 ;Volum 30.(3) s. 631-640
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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 in broadband optical parametric oscillators (OPOs). The OPOs were operated near degeneracy and 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 allows for simultaneous detection of several gases. We observe an effective path-length enhancement due to coherent interaction inside the OPO cavity and achieve part-per-billion sensitivity levels. The measured spectral shapes are in good agreement with a model that takes into account group delay dispersion across the broad OPO frequency band.
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