| Autor: |
Medhi, Gautam, Fredricksen, Chris J., Peale, Robert E., Muravjov, Andrey V., Edwards, Oliver J. |
| Zdroj: |
Proceedings of SPIE; February 2012, Vol. 8236 Issue: 1 p82361J-82361J-8, 741258p |
| Abstrakt: |
A quantum cascade laser at IR wavelengths with an open external cavity presents an opportunity for spectral sensing of molecular compounds that have low vapor pressure. The sensitivity of such a system is potentially very high due to extraordinarily long effective optical paths that can be achieved in an active cavity. We demonstrate here an external cavity mid-IR QCL molecular absorption sensor using a fixed Fabry-Perot etalon as the spectrum analyzer. The system is sensitive to the water vapor present in the laboratory air with an absorption coefficient of just 9.6 x 10-8cm-1. The system is sensitive enough to detect the absorption coefficient of TNT vapor at room temperature. |
| Databáze: |
Supplemental Index |
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