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Proceedings Paper

Bloch gain in quantum cascade lasers
Author(s): R. Terazzi; T. Gresch; M. Giovannini; N. Sekine; J. Faist
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Paper Abstract

Laser action by a weak to vanishing population inversion is observed in mid-infrared (7 μm) quantum cascade lasers. The origin of the optical gain is the same than for the Bloch oscillator predicted in superlattices. This special gain does not only relax the threshold condition for lasing, but also underlines the major role played by coherent processes in semiconductor heterostructures, as it is based on scattering assisted optical transitions.

Paper Details

Date Published: 29 January 2008
PDF: 11 pages
Proc. SPIE 6909, Novel In-Plane Semiconductor Lasers VII, 69090Z (29 January 2008); doi: 10.1117/12.774258
Show Author Affiliations
R. Terazzi, ETH Zuerich (Switzerland)
T. Gresch, ETH Zuerich (Switzerland)
M. Giovannini, Univ. of Neuchâtel (Switzerland)
N. Sekine, Univ. of Tokyo (Japan)
J. Faist, ETH Zuerich (Switzerland)

Published in SPIE Proceedings Vol. 6909:
Novel In-Plane Semiconductor Lasers VII
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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