Feasibility of GaAs/AlGaAs quantum cascade laser operating above 6 THz

A band design of a quantum cascade laser with a generation frequency higher than 6 THz and an active region based on four GaAs/Al0.14Ga0.86As quantum wells is proposed. Calculations were carried out based on the solution of the Schrödinger equation taking into account the dephasing of quantum states...

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Bibliographic Details
Published in:Journal of applied physics 2024-04, Vol.135 (13)
Main Authors: Ushakov, D. V., Afonenko, A. A., Afonenko, An. A., Khabibullin, R. A., Fadeev, M. A., Gavrilenko, V. I., Dubinov, A. A.
Format: Article
Language:English
Subjects:
Aluminum gallium arsenides
Gallium arsenide
Mathematical analysis
Operating temperature
Quantum cascade lasers
Quantum wells
Schrodinger equation
Waveguides
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Summary:A band design of a quantum cascade laser with a generation frequency higher than 6 THz and an active region based on four GaAs/Al0.14Ga0.86As quantum wells is proposed. Calculations were carried out based on the solution of the Schrödinger equation taking into account the dephasing of quantum states, as well as a closed system of balance equations. The temperature dependences of the gain at frequencies of 6.3–6.6 THz were calculated for the proposed quantum cascade laser with a double metal waveguide. Features of the proposed laser structure include two injection quantum wells and the suppression of non-radiative transitions between laser levels. According to calculations, this provides the maximum operating temperature of up to 81 K at 6.4 THz. The results of this study open up the way for quantum cascade lasers based on GaAs/AlGaAs to operate at frequencies above 6 THz.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0198236