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AlGaAs/GaAs Distributed Feedback Quantum Cascade Lasers

  • W. Schrenk (a1), N. Finger (a1), S. Gianordoli (a1), G. Strasser (a1) and E. Gornik (a1)...

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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AlGaAs/GaAs Distributed Feedback Quantum Cascade Lasers

  • W. Schrenk (a1), N. Finger (a1), S. Gianordoli (a1), G. Strasser (a1) and E. Gornik (a1)...

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