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• W2756165784 abstract "The mechanisms that limit the temperature performance of diagonal GaAs/Al0.15GaAs0.85-based terahertz quantum cascade lasers (THz-QCLs) have been identified as thermally activated leakage of charge carriers through excited states into the continuum. THz-QCLs with energetically higher-laying excited states supported by sufficiently high barriers aim to eliminate these leakage mechanisms and lead to improved temperature performance. Although suppression of thermally activated carrier leakage was realized in a three-well THz-QCL based on a resonant-phonon scheme, no improvement in the temperature performance was reported thus far. Here, we report a major improvement in the temperature performance of a two-quantum-well direct-phonon THz-QCL structure. We show that the improved laser performance is due to the suppression of the thermally activated carrier leakage into the continuum with the increase in the injection barrier height. Moreover, we demonstrate that high-barrier two-well structures can support a clean three-level laser system at elevated temperatures, which opens the opportunity to achieve temperature performance beyond the state-of-the-art." @default.
• W2756165784 created "2017-09-25" @default.
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• W2756165784 date "2017-09-11" @default.
• W2756165784 modified "2023-09-26" @default.
• W2756165784 title "Two-well terahertz quantum cascade lasers with suppressed carrier leakage" @default.
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• W2756165784 doi "https://doi.org/10.1063/1.4996567" @default.
• W2756165784 hasPublicationYear "2017" @default.
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