Title :
Optimisation of resonant tunnelling injection and doping density in high-performance THz superlattice quantum cascade lasers
Author :
Barbieri, S. ; Alton, J. ; Worrall, C. ; Houghton, M. ; Beere, H.E. ; Linfield, E.H. ; Ritchie, D.A.
Author_Institution :
TeraView Ltd., Cambridge, UK
Abstract :
This study attempts to reduce the fast increase of threshold current densities JTH with temperature by optimising the performance of a recently demonstrated superlattice QCL emitting at λ = 100 μm using different active region doping levels. In addition, this work studies the injection efficiency as a function of the thickness of the Al0.15Ga0.85As barrier controlling the tunnel coupling between the superlattice miniband and the upper state of the laser transition.
Keywords :
III-V semiconductors; aluminium compounds; doping; gallium arsenide; laser transitions; optimisation; quantum cascade lasers; resonant tunnelling; submillimetre wave lasers; 100 mum; Al0.15Ga0.85As; Al0.15Ga0.85As barrier; THz lasers; active region doping levels; doping density; high-performance lasers; laser transition; optimisation; quantum cascade lasers; resonant tunnelling injection; superlattice lasers; superlattice miniband; tunnel coupling; Doping; Laser transitions; Optical control; Optical coupling; Quantum cascade lasers; Resonant tunneling devices; Superlattices; Temperature; Thickness control; Threshold current;
Conference_Titel :
Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE
Print_ISBN :
0-7803-8557-8
DOI :
10.1109/LEOS.2004.1363357
