ICL-Based OF-CEAS: A Sensitive Tool for Analytical Chemistry
| Autor: | Katharine M. Hunter, Katherine M. Manfred, Luca Ciaffoni, Grant A. D. Ritchie |
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| Rok vydání: | 2016 |
| Předmět: |
Spectrometer
Absorption spectroscopy Chemistry Analytical chemistry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Noise (electronics) Analytical Chemistry law.invention 010309 optics law Cascade Optical cavity 0103 physical sciences 0210 nano-technology Spectroscopy Absorption (electromagnetic radiation) |
| Zdroj: | Analytical Chemistry. 89:902-909 |
| ISSN: | 1520-6882 0003-2700 |
| DOI: | 10.1021/acs.analchem.6b04030 |
| Popis: | Optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) using mid-infrared interband cascade lasers (ICLs) is a sensitive technique for trace gas sensing. The setup of a V-shaped optical cavity operating with a 3.29 μm cw ICL is detailed, and a quantitative characterization of the injection efficiency, locking stability, mode matching, and detection sensitivity is presented. The experimental data are supported by a model to show how optical feedback affects the laser frequency as it is scanned across several longitudinal modes of the optical cavity. The model predicts that feedback enhancement effects under strongly absorbing conditions can cause underestimations in the measured absorption, and these predictions are verified experimentally. The technique is then used in application to the detection of nitrous oxide as an exemplar of the utility of this technique for analytical gas phase spectroscopy. The analytical performance of the spectrometer, expressed as noise equivalent absorption coefficient, was estimated as 4.9 × 10 |
| Databáze: | OpenAIRE |
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