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- W1970587878 abstract "We have investigated the importance of intervalley (Γ–Χ) electron transfer between Γ-point quantum well states and X-point barrier states in GaAs-based quantum cascade lasers with indirect band gap AlAs barriers. A series of samples has been studied in which the energy separation between the coupled injector/upper laser levels and the lowest confined X state in the injection barrier is varied. We demonstrate that for lasing to occur, electron injection into the upper laser level must proceed via Γ states confined below the lowest X state in the injection barrier. The limit this places on the minimum operating wavelength (λ≈8 μm) for the present laser design is overcome by utilizing a double injection barrier to achieve lasing at λ=7.2 μm." @default.
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- W1970587878 date "2002-08-19" @default.
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- W1970587878 title "Intervalley scattering in GaAs–AlAs quantum cascade lasers" @default.
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- W1970587878 doi "https://doi.org/10.1063/1.1500775" @default.
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