Paper Info
Title
Widely-Tunable Quantum Cascade-Based Sources for the Development of Optical Gas Sensors.
Abstract
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 (similar to 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.
Year
DOI
Venue
2020
10.3390/s20226650
SENSORS
Keywords
DocType
Volume
quantum cascade laser,widely tunable laser sources,mid-infrared laser sources,laser spectroscopy,QCL array,external-cavity systems,intra-cavity laser absorption spectroscopy,compliance voltage technique,gas sensors
Journal
20
Issue
ISSN
Citations 
22
1424-8220
0
PageRank 
References 
Authors
0.34
0
8
Name
Order
Citations
PageRank
Virginie Zéninari100.34
Raphaël Vallon200.34
Laurent Bizet300.34
Clément Jacquemin400.34
Guillaume Aoust500.68
Grégory Maisons600.34
Mathieu Carras700.34
Bertrand Parvitte800.68