Mobile photoacoustic trace-gas monitoring using high power quantum cascade lasers as pump sources operated near room temperature

2001 ◽  
Author(s):  
M. Nagele ◽  
M.W. Sigrist ◽  
D. Hofstetter ◽  
T. Aellen ◽  
M. Beck ◽  
...  
Keyword(s):  
High Power ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Trace Gas ◽  
Gas Monitoring ◽  
Quantum Cascade ◽  
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

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.

High-power λ∼9.5μm quantum-cascade lasers operating above room temperature in continuous-wave mode

2006 ◽  
Vol 88 (9) ◽  
pp. 091113 ◽  
Author(s):  
J. S. Yu ◽  
S. Slivken ◽  
A. Evans ◽  
S. R. Darvish ◽  
J. Nguyen ◽  
...  
Keyword(s):  
High Power ◽  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade Lasers ◽  
Wave Mode ◽  
Quantum Cascade ◽  
Continuous Wave Mode ◽  
Cascade Lasers

High-power room-temperature continuous-wave operation of quantum cascade lasers grown by GasMBE

2004 ◽  
Author(s):  
Allan J. Evans ◽  
John E. David ◽  
Lisa C. Doris ◽  
Jae S. Yu ◽  
Steven Slivken ◽  
...  
Keyword(s):  
High Power ◽  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Continuous Wave Operation ◽  
Cascade Lasers

High-power long-wavelength (/spl lambda//spl sim/11.5 μm) quantum cascade lasers operating above room temperature

1998 ◽  
Vol 10 (8) ◽  
pp. 1100-1102 ◽  
Author(s):  
J. Faist ◽  
C. Sirtori ◽  
F. Capasso ◽  
D.L. Sivco ◽  
J.N. Baillargeon ◽  
...  
Keyword(s):  
High Power ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Long Wavelength ◽  
Quantum Cascade ◽  
Cascade Lasers
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