Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis
| Autor: | Sabine Riedi, Jérôme Faist, Matthias Beck, P. Morten Hundt, Martin J. Süess, Johanna Wolf, Béla Tuzson, Romain Peretti, Lukas Emmenegger, Herbert Looser |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Time delay and integration
lcsh:Applied optics. Photonics Materials science multi-wavelength Transfer-matrix method (optics) 02 engineering and technology 01 natural sciences law.invention 010309 optics trace gas analysis quantum cascade lasers laser spectroscopy etaloning thermal effects Optics law 0103 physical sciences Chirp Radiology Nuclear Medicine and imaging Absorption (electromagnetic radiation) Instrumentation business.industry lcsh:TA1501-1820 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics Trace gas Quantum cascade lasers Multi-wavelength Laser spectroscopy Etaloning Thermal effects Trace gas analysis Cascade Continuous wave 0210 nano-technology business |
| Zdroj: | Photonics; Volume 3; Issue 2; Pages: 24 Photonics, 3 (2) Photonics, Vol 3, Iss 2, p 24 (2016) |
| ISSN: | 2304-6732 |
| DOI: | 10.3390/photonics3020024 |
| Popis: | 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. Photonics, 3 (2) |
| Databáze: | OpenAIRE |
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