scholarly journals Leakages suppression by isolating the desired quantum levels for high-temperature terahertz quantum cascade lasers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Li Wang ◽  
Tsung-Tse Lin ◽  
Mingxi Chen ◽  
Ke Wang ◽  
Hideki Hirayama
Keyword(s):  
High Temperature ◽  
Quantum Well ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Thermally Activated ◽  
High Fraction ◽  
Consistent Method ◽  
Cascade Lasers ◽  
Non Equilibrium Green’S Function

AbstractThe key challenge for terahertz quantum cascade lasers (THz-QCLs) is to make it operating at room-temperature. The suppression of thermally activated leakages via high lying quantum levels is emphasized recently. In this study, we employ the advanced self-consistent method of non-equilibrium Green’s function, aiming to reveal those kinds of leakages in the commonly used THz-QCL designs based on 2-, 3- and 4-quantum well. At the high temperature of 300 K, if all the confined high lying quantum levels and also the continuums are included within three neighboring periods, leakages indeed possess high fraction of the total current (21%, 30%, 50% for 2-, 3- and 4-quantum well designs, respectively). Ministep concept is introduced to weaken those leakage channels by isolating the desired levels from high lying ones, thus the leakages are well suppressed, with corresponding fractions less than 5% for all three designs.

scholarly journals Turn-key compact high temperature terahertz quantum cascade lasers: imaging and room temperature detection

2006 ◽  
Vol 14 (5) ◽  
pp. 1829 ◽  
Author(s):  
Erik Bründermann ◽  
Martina Havenith ◽  
Giacomo Scalari ◽  
Marcella Giovannini ◽  
Jérôme Faist ◽  
...  
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Temperature Detection ◽  
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 High-temperature and high-power terahertz quantum-cascade lasers

2007 ◽  
Author(s):  
Benjamin S. Williams ◽  
Qi Qin ◽  
Sushil Kumar ◽  
Qing Hu ◽  
John L. Reno
Keyword(s):  
High Temperature ◽  
High Power ◽  
Quantum Cascade Lasers ◽  
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

Room temperature mid-infrared quantum cascade lasers

1996 ◽  
Vol 32 (6) ◽  
pp. 560 ◽  
Author(s):  
J. Faist ◽  
F. Capasso ◽  
C. Sirtori ◽  
D.L. Sivco ◽  
A.L. Hutchinson ◽  
...  
Keyword(s):  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Cascade Lasers

Room-Temperature GaAs/AlGaAs Quantum Cascade Lasers Grown by Metal–Organic Vapor Phase Epitaxy

2011 ◽  
Vol 23 (12) ◽  
pp. 774-776 ◽  
Author(s):  
A B Krysa ◽  
D G Revin ◽  
J P Commin ◽  
C N Atkins ◽  
K Kennedy ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Room Temperature ◽  
Quantum Cascade Lasers ◽  
Vapor Phase Epitaxy ◽  
Quantum Cascade ◽  
Organic Vapor ◽  
Metal Organic ◽  
Cascade Lasers

Room temperature continuous wave operation of λ ∼ 3–3.2 μm quantum cascade lasers

2012 ◽  
Vol 101 (24) ◽  
pp. 241110 ◽  
Author(s):  
N. Bandyopadhyay ◽  
Y. Bai ◽  
S. Tsao ◽  
S. Nida ◽  
S. Slivken ◽  
...  
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade Lasers ◽  
Quantum Cascade ◽  
Continuous Wave Operation ◽  
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.

Sign in / Sign up

Export Citation Format

Share Document