Trace gas measurements using optically resonant cavities and quantum cascade lasers operating at room temperature

2008 ◽  
Vol 104 (9) ◽  
pp. 093115 ◽  
Author(s):  
S. Welzel ◽  
G. Lombardi ◽  
P. B. Davies ◽  
R. Engeln ◽  
D. C. Schram ◽  
...  
Keyword(s):  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Trace Gas ◽  
Resonant Cavities ◽  
Quantum Cascade ◽  
Gas Measurements ◽  
Cascade Lasers

Photoacoustic spectroscopy for trace gas detection with cryogenic and room-temperature continuous-wave quantum cascade lasers

Open Physics ◽  
2010 ◽  
Vol 8 (2) ◽  
Author(s):  
Virginie Zeninari ◽  
Agnès Grossel ◽  
Lilian Joly ◽  
Thomas Decarpenterie ◽  
Bruno Grouiez ◽  
...  
Keyword(s):  
Detection Limit ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Gas Detection ◽  
Trace Gas ◽  
Atmospheric Gases ◽  
Trace Gas Detection ◽  
Quantum Cascade ◽  
Cascade Lasers

AbstractThe main characteristics that a sensor must possess for trace gas detection and pollution monitoring are high sensitivity, high selectivity and the capability to perform in situ measurements. The photacoustic Helmholtz sensor developed in Reims, used in conjunction with powerful Quantum Cascade Lasers (QCLs), fulfils all these requirements. The best cell response is # 1200 V W−1 cm and the corresponding ultimate sensitivity is j 3.3 × 10−10 W cm−11 Hz−11/2. This efficient sensor is used with mid-infrared QCLs from Alpes Lasers to reach the strong fundamental absorption bands of some atmospheric gases. A first cryogenic QCL emitting at 7.9 μm demonstrates the detection of methane in air with a detection limit of 3 ppb. A detection limit of 20 ppb of NO in air is demonstrated using another cryogenic QCL emitting in the 5.4 μm region. Real in-situ measurements can be achieved only with room-temperature QCLs. A room-temperature QCL emitting in the 7.9 μm region demonstrates the simultaneous detection of methane and nitrous oxide in air (17 and 7 ppb detection limit, respectively). All these reliable measurements allow the estimated detection limit for various atmospheric gases using quantum cascade lasers to be obtained. Each gas absorbing in the infrared may be detected at a detection limit in the ppb or low-ppb range.

Applications of quantum cascade lasers for sensitive trace gas measurements of CO, CH4, N2O and HCHO

2008 ◽  
Vol 92 (3) ◽  
pp. 419-430 ◽  
Author(s):  
C.L. Schiller ◽  
H. Bozem ◽  
C. Gurk ◽  
U. Parchatka ◽  
R. Königstedt ◽  
...  
Keyword(s):  
Quantum Cascade Lasers ◽  
Trace Gas ◽  
Quantum Cascade ◽  
Gas Measurements ◽  
Cascade Lasers

λ∼3.36 μm room temperature InGaAs/AlAs(Sb) quantum cascade lasers with third order distributed feedback grating

2010 ◽  
Vol 97 (11) ◽  
pp. 111113 ◽  
Author(s):  
J. P. Commin ◽  
K. Kennedy ◽  
D. G. Revin ◽  
S. Y. Zhang ◽  
A. B. Krysa ◽  
...  
Keyword(s):  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Distributed Feedback ◽  
Third Order ◽  
Quantum Cascade ◽  
Cascade Lasers

scholarly journals λ~71 μm quantum cascade lasers with 19% wall-plug efficiency at room temperature

2011 ◽  
Vol 19 (18) ◽  
pp. 17203 ◽  
Author(s):  
Richard Maulini ◽  
Arkadiy Lyakh ◽  
Alexei Tsekoun ◽  
C. Kumar N. Patel
Keyword(s):  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Wall Plug Efficiency ◽  
Cascade Lasers

High-power long-wavelength room-temperature MOVPE-grown quantum cascade lasers with air-semiconductor waveguide

2008 ◽  
Vol 44 (8) ◽  
pp. 525 ◽  
Author(s):  
Q.J. Wang ◽  
C. Pflügl ◽  
L. Diehl ◽  
F. Capasso ◽  
S. Furuta ◽  
...  
Keyword(s):  
High Power ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Long Wavelength ◽  
Quantum Cascade ◽  
Cascade Lasers
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