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New Designs of Laser Transitions in Terahertz Quantum–Cascade Lasers by D. V. Ushakov; A. A. Afonenko; D. S. Ponomarev; S. S. Pushkarev; V. I. Gavrilenko; R. A. Khabibullin is a Physics and Astronomy article available to read on EtoBox.

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We study the band designs of terahertz quantum-cascade lasers (THz QCLs) with an active region of GaAs/Al x Ga 1−x As quantum wells (QWs) by using the solution of the Schrödinger equation with allowance for dephasing of quantum states, as well as solving a system of closed balance equations. For two-QW designs with increased Al x Ga 1−x As potential barrier height (x = 0.20, 0.25, and 0.30), temperature dependences of the peak gain are calculated. It is shown that by increasing the aluminum content in the barrier layers compared to the conventional x = 0.15, it becomes possible to increase the operating temperatures of THz QCLs by more than 220 K. Two new designs of laser transitions are proposed to increase the output power and operating temperature of THz QCLs. To increase the output power, a design with a two-photon scheme of laser transitions was proposed, which causes an approximately twofold slower drop in the nonlinear gain with increasing photon density. To increase operating temperatures, it is suggested to use weakly localized electron states with wave functions extending over two or more periods of the structure. The matrix element of dipole transitions in such structure

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Author

D. V. Ushakov; A. A. Afonenko; D. S. Ponomarev; S. S. Pushkarev; V. I. Gavrilenko; R. A. Khabibullin

Publisher

Springer Science and Business Media LLC

Published

2022

Language

EN

Field

Physics and Astronomy (Physical Sciences)