Intracavity trace molecular detection with a broadband mid-IR frequency comb source
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.
Additional Information
© 2013 Optical Society of America. Received December 3, 2012; revised January 16, 2013; accepted January 18, 2013; posted January 22, 2013 (Doc. ID 181061); published February 15, 2013. We greatly thank NASA, Office of Naval Research, Air Force Office of Scientific Research, Agilent Technologies, Sanofi-Aventis, Stanford University Bio-X, Stanford Medical School, and Stanford Woods Institute for their financial support. We also thank Leo Hollberg, Robert Byer, Martin Fejer, and Alex Kachanov for the most useful discussions. M.W.H. is indebted to Gunnar Arisholm for his comments on the manuscript.Attached Files
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Additional details
- Eprint ID
- 86946
- Resolver ID
- CaltechAUTHORS:20180608-153239292
- NASA
- Office of Naval Research (ONR)
- Air Force Office of Scientific Research (AFOSR)
- Agilent Technologies
- Sanofi-Aventis
- Stanford University Bio-X
- Stanford Medical School
- Stanford Woods Institute for the Environment
- Created
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2018-06-08Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field