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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 3 — Mar. 1, 2013
  • pp: 631–640

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

Magnus W. Haakestad, Tobias P. Lamour, Nick Leindecker, Alireza Marandi, and Konstantin L. Vodopyanov  »View Author Affiliations


JOSA B, Vol. 30, Issue 3, pp. 631-640 (2013)
http://dx.doi.org/10.1364/JOSAB.30.000631


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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 800cm1 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.

© 2013 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(300.6340) Spectroscopy : Spectroscopy, infrared
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(010.1030) Atmospheric and oceanic optics : Absorption

ToC Category:
Spectroscopy

History
Original Manuscript: December 3, 2012
Revised Manuscript: January 16, 2013
Manuscript Accepted: January 18, 2013
Published: February 15, 2013

Citation
Magnus W. Haakestad, Tobias P. Lamour, Nick Leindecker, Alireza Marandi, and Konstantin L. Vodopyanov, "Intracavity trace molecular detection with a broadband mid-IR frequency comb source," J. Opt. Soc. Am. B 30, 631-640 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-3-631

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