Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3481698
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- SNF [200020-116749]
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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 k(B)T/h nu=2.3 between the lattice thermal energy and the laser photon energy. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3481698]
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