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AlGaAs/GaAs Distributed Feedback Quantum Cascade Lasers

Published online by Cambridge University Press:  10 February 2011

W. Schrenk,
N. Finger,
S. Gianordoli,
G. Strasser and
E. Gornik
W. Schrenk
Affiliation:
Solid State Electronics, TU Wien, AUSTRIA, http://www.fke.tuwien.ac.at/
N. Finger
Affiliation:
Solid State Electronics, TU Wien, AUSTRIA, http://www.fke.tuwien.ac.at/
S. Gianordoli
Affiliation:
Solid State Electronics, TU Wien, AUSTRIA, http://www.fke.tuwien.ac.at/
G. Strasser
Affiliation:
Solid State Electronics, TU Wien, AUSTRIA, http://www.fke.tuwien.ac.at/
E. Gornik
Affiliation:
Solid State Electronics, TU Wien, AUSTRIA, http://www.fke.tuwien.ac.at/
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Abstract

We report on the realization of distributed feedback quantum cascade lasers in the GaAs/AIGaAs material system. The use of a metallized surface relief grating for feedback allows a fabrication process without regrowth. A feature of this laser is that either single mode or double mode emission at λ ≍ 10 µm is achieved, which is typical for index coupled lasers. The coupling coefficient is measured from the mode spacing for double mode emission of a strong overcoupled laser to be κ ≍ 24 cm"−1. The emission wavenumber can be continuously tuned with the temperature at a rate of dv / dT ≍ 0.048 cm−1/K, which is in close agreement to the temperature dependence of the refractive index of GaAs.

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