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| Content Provider | MDPI |
|---|---|
| Author | Süess, Martin Hundt, P. Tuzson, Béla Riedi, Sabine Wolf, Johanna Peretti, Romain Beck, Mattias Looser, Herbert Emmenegger, Lukas Faist, Jérôme |
| Abstract | We report on the dynamic behavior of dual-wavelength distributed feedback (DFB) quantum cascade lasers (QCLs) in continuous wave and intermittent continuous wave operation. We investigate inherent etaloning effects based on spectrally resolved light-current-voltage (LIV) characterization and perform time-resolved spectral analysis of thermal chirping during long (>5 µs) current pulses. The theoretical aspects of the observed behavior are discussed using a combination of finite element method simulations and transfer matrix method calculations of dual-section DFB structures. Based on these results, we demonstrate how the internal etaloning can be minimized using anti-reflective (AR) coatings. Finally, the potential and benefits of these devices for high precision trace gas analysis are demonstrated using a laser absorption spectroscopic setup. Thereby, the atmospherically highly relevant compounds CO2 (including its major isotopologues), CO and N2O are simultaneously determined with a precision of 0.16 ppm, 0.22 ppb and 0.26 ppb, respectively, using a 1-s integration time and an optical path-length of 36 m. This creates exciting new opportunities in the development of compact, multi-species trace gas analyzers. |
| File Size | 4904960 |
| File Format | |
| e-ISSN | 23046732 |
| DOI | 10.3390/photonics3020024 |
| Journal | Photonics |
| Issue Number | 2 |
| Volume Number | 3 |
| Language | English |
| Publisher Date | 2016-04-30 |
| Access Restriction | Open |
| Subject Keyword | quantum cascade lasers multi-wavelength laser spectroscopy etaloning thermal effects trace gas analysis |
| Content Type | Text |
| Resource Type | Article |
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