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Optical feedback cavity-enhanced absorption spectroscopy with a 3.24 μm interband cascade laser.
- Source :
-
Applied Physics Letters . 6/1/2015, Vol. 106 Issue 22, p1-4. 4p. 1 Diagram, 3 Graphs. - Publication Year :
- 2015
-
Abstract
- The development of interband cascade lasers (ICLs) has made the strong C-H transitions in the 3 μm spectral region increasingly accessible. We present the demonstration of a single mode distributed feedback ICL coupled to a V-shaped optical cavity in an optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) experiment. We achieved a minimum detectable absorption coefficient, αmin, of (7.1±0.2)×10-8 cm-1 for a spectrum of CH4 at 3.24 μm with a two second acquisition time (100 scans averaged). This corresponds to a detection limit of 3 ppb CH4 at atmospheric pressure, which is comparable to previously reported OF-CEAS instruments with diode lasers or quantum cascade lasers. The ability to frequency lock an ICL source in the important 3 μm region to an optical cavity holds great promise for future spectroscopic applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 106
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 103126906
- Full Text :
- https://doi.org/10.1063/1.4922149