Widely-Tunable Quantum Cascade-Based Sources for the Development of Optical Gas Sensors
| Autor: | Zéninari, Virginie, Vallon, Raphaël, Bizet, Laurent, Jacquemin, Clément, Aoust, Guillaume, Maisons, Grégory, Carras, Mathieu, Parvitte, Bertrand |
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| Přispěvatelé: | Groupe de spectrométrie moléculaire et atmosphérique (GSMA), Université de Reims Champagne-Ardenne (URCA)-Centre National de la Recherche Scientifique (CNRS), Mirsense, Nanno-INNOV |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
[PHYS]Physics [physics]
QCL array intra-cavity laser absorption spectroscopy quantum cascade laser lcsh:Chemical technology Article widely tunable laser sources gas sensors compliance voltage technique external-cavity systems laser spectroscopy lcsh:TP1-1185 mid-infrared laser sources ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Sensors Volume 20 Issue 22 Sensors, MDPI, 2020, 20 (22), pp.6650. ⟨10.3390/s20226650⟩ Sensors, Vol 20, Iss 6650, p 6650 (2020) Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s20226650 |
| Popis: | Spectroscopic techniques based on Distributed FeedBack (DFB) Quantum Cascade Lasers (QCL) provide good results for gas detection in the mid-infrared region in terms of sensibility and selectivity. The main limitation is the QCL relatively low tuning range (~10 cm−1) that prevents from monitoring complex species with broad absorption spectra in the infrared region or performing multi-gas sensing. To obtain a wider tuning range, the first solution presented in this paper consists of the use of a DFB QCL array. Tuning ranges from 1335 to 1387 cm−1 and from 2190 to 2220 cm−1 have been demonstrated. A more common technique that will be presented in a second part is to implement a Fabry–Perot QCL chip in an external-cavity (EC) system so that the laser could be tuned on its whole gain curve. The use of an EC system also allows to perform Intra-Cavity Laser Absorption Spectroscopy, where the gas sample is placed within the laser resonator. Moreover, a technique only using the QCL compliance voltage technique can be used to retrieve the spectrum of the gas inside the cavity, thus no detector outside the cavity is needed. Finally, a specific scheme using an EC coherent QCL array can be developed. All these widely-tunable Quantum Cascade-based sources can be used to demonstrate the development of optical gas sensors. |
| Databáze: | OpenAIRE |
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