Magnetically assisted quantum cascade laser emitting from 740 GHz to 1.4 THz

Scalari, Giacomo; Turcˇinková, Dana; Lloyd-Hughes, James; Amanti, Maria I.; Fischer, Milan; Beck, Mattias; Faist, Jérôme
August 2010
Applied Physics Letters;8/23/2010, Vol. 97 Issue 8, p081110
Academic Journal
In this paper we show that by applying a perpendicular magnetic field to a quantum cascade structure it is possible to enhance the gain of different optical transitions. The combination of magnetic confinement with a broadband, cutoff-free optical resonator allows the demonstration of laser action over a large bandwidth, from 733 GHz to 1.38 THz together with the emission at 3.2 THz. A different lasing scheme is revealed that does not rely on resonant tunneling as the main injection mechanism. In combination with the magnetically enhanced gain laser emission at 1 THz is observed up to a temperature of 115 K, which corresponds to a ratio kBT/hν=2.3 between the lattice thermal energy and the laser photon energy.


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