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DOI: 10.17586/1023-5086-2024-91-01-33-38
УДК: 535-15; 537.862
The minimum number of stages in a terahertz GaAs/AlGaAs quantum-cascade laser with a waveguide of metal-to-metal
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Publication in Journal of Optical Technology
Дубинов А.А. Минимальное число каскадов в терагерцовом квантово-каскадном лазере на основе GaAs/AlGaAs с волноводом металл-металл // Оптический журнал. 2024. Т. 91. № 1. С. 33–38. http://doi.org/10.17586/1023-5086-2024-91-01-33-38
Dubinov A.A. The minimum number of stages in a terahertz GaAs/AlGaAs quantum-cascade laser with a waveguide of metal-to-metal [in Russian] // Opticheskii Zhurnal. 2024. V. 91. № 1. P. 33–38. http://doi.org/10.17586/1023-5086-2024-91-01-33-38
Alexander A. Dubinov, "Minimum number of stages in a GaAs/AlGaAs terahertz quantum cascade laser with a metal-to-metal waveguide," Journal of Optical Technology. 91(1),19-22 (2024). https://doi.org/10.1364/JOT.91.000019
Subject of study. Absorption coefficient of a metal-to-metal waveguide of a terahertz quantum cascade laser based on heterostructures GaAs/AlGaAs. Aim of study. Theoretical study of the possibility of significantly reducing the number of cascades (thickness of the active region) in terahertz quantum cascade lasers based on two previously implemented cascade designs with GaAs/AlGaAs heterostructures with significant gains and a metal-to-metal waveguide. Method. The absorption coefficient of the metal-to-metal waveguide was calculated numerically by the method of transfer matrices from Maxwell's equations. Main results. The cascade number dependence of the absorption coefficient of a metal-metal waveguide of a terahertz quantum-cascade laser is determined. Only 5 stages are sufficient for generation with a total waveguide thickness of 428 nm for a laser with a gain of 200 cm–1 at a temperature of 100 K. Practical significance. Calculations show that it is possible to significantly reduce the active region thickness and the number of stages in a terahertz quantum-cascade laser, which should facilitate the simplification of its creation and wider use.
absorption coefficient, quantum-cascade laser, active region thickness
Acknowledgements:the work was supported by the Russian Science Foundation, grant № 23-19-00436.
OCIS codes: 140.3070, 140.5965, 140.3410
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