Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 30, Issue 3, Pages 631-640Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.30.000631
Keywords
-
Categories
Funding
- NASA
- Office of Naval Research
- Air Force Office of Scientific Research
- Agilent Technologies
- Sanofi-Aventis
- Stanford University Bio-X
- Stanford Medical School
- Stanford Woods Institute
Ask authors/readers for more resources
Ultrasensitive detection of methane, isotopic carbon dioxide, carbon monoxide, formaldehyde, acetylene, and ethylene is performed in the spectral range 2.5-5 mu m 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. (c) 2013 Optical Society of America
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available