DocumentCode :
1144144
Title :
Short-Injector Quantum Cascade Laser Emitting at 8- 
m Wavelength With High Slope Efficiency
Author :
Vizbaras, Augustinas ; Katz, Simeon ; Boehm, Gerhard ; Amann, Markus-Christian
Author_Institution :
Walter Schottky Inst., Tech. Univ. Munchen, Garching, Germany
Volume :
21
Issue :
19
fYear :
2009
Firstpage :
1384
Lastpage :
1386
Abstract :
This letter presents experimental results of a three-alloy-based short-injector quantum cascade laser (QCL). The investigated 4-mm-long device shows a pulsed threshold current density of 1.24 kA/cm2 , a slope efficiency of 1.4 W/A, a characteristic temperature above 250 K, and a peak average output power above 726 mW at room temperature. A good high-temperature performance is attributed to the diagonal transition design and better depopulation of the lower laser levels at higher temperatures. The laser emission wavelength at room temperature is 8 mum, resulting in a low voltage defect of 71 meV per period for the QCL structure.
Keywords :
aluminium compounds; current density; gallium arsenide; indium compounds; infrared sources; laser transitions; laser variables measurement; quantum cascade lasers; AlInAs-GaInAs; QCL; characteristic temperature; diagonal transition design; electron volt energy 71 meV; laser level depopulation; quantum cascade laser; size 4 mm; slope efficiency; temperature 293 K to 298 K; threshold current density; wavelength 8 mum; High slope efficiency; high ${T}_{0}$
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2009.2027334
Filename :
5170078
Link To Document :
