Temperature dependence of the key electro-optical characteristics for midinfrared emitting quantum cascade lasers

D. Botez; S. Kumar; J. C. Shin; L. J. Mawst; I. Vurgaftman; J. R. Meyer

doi:10.1063/1.3478836

Temperature dependence of the key electro-optical characteristics for midinfrared emitting quantum cascade lasers

D. Botez, S. Kumar, J. C. Shin, L. J. Mawst, I. Vurgaftman, J. R. Meyer

Department of Electronics & Electrical Engineering

Research output: Contribution to journal › Article › peer-review

82 Scopus citations

Abstract

The equations for threshold-current density J_th, differential quantum efficiency η_d, and maximum wallplug efficiency η_wp,max for quantum-cascade lasers (QCLs) are modified for electron leakage and backfilling. A thermal-excitation model of "hot" injected electrons from the upper laser state to upper active-region states is used to calculate leakage currents. The calculated characteristic temperature T₀ for J_th is found to agree well with experiment for both conventional and deep-well (DW) QCLs. For conventional QCLs η_wp,max is found to be strongly temperature dependent; explaining experimental data. At 300 K for optimized DW-QCLs, front-facet, continuous-wave η_wp,max values >20% are projected.

Original language	English
Article number	071101
Journal	Applied Physics Letters
Volume	97
Issue number	7
DOIs	https://doi.org/10.1063/1.3478836
State	Published - 16 Aug 2010

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abstract = "The equations for threshold-current density Jth, differential quantum efficiency ηd, and maximum wallplug efficiency ηwp,max for quantum-cascade lasers (QCLs) are modified for electron leakage and backfilling. A thermal-excitation model of {"}hot{"} injected electrons from the upper laser state to upper active-region states is used to calculate leakage currents. The calculated characteristic temperature T0 for Jth is found to agree well with experiment for both conventional and deep-well (DW) QCLs. For conventional QCLs ηwp,max is found to be strongly temperature dependent; explaining experimental data. At 300 K for optimized DW-QCLs, front-facet, continuous-wave ηwp,max values >20% are projected.",

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AU - Botez, D.

AU - Kumar, S.

AU - Shin, J. C.

AU - Mawst, L. J.

AU - Vurgaftman, I.

AU - Meyer, J. R.

PY - 2010/8/16

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AB - The equations for threshold-current density Jth, differential quantum efficiency ηd, and maximum wallplug efficiency ηwp,max for quantum-cascade lasers (QCLs) are modified for electron leakage and backfilling. A thermal-excitation model of "hot" injected electrons from the upper laser state to upper active-region states is used to calculate leakage currents. The calculated characteristic temperature T0 for Jth is found to agree well with experiment for both conventional and deep-well (DW) QCLs. For conventional QCLs ηwp,max is found to be strongly temperature dependent; explaining experimental data. At 300 K for optimized DW-QCLs, front-facet, continuous-wave ηwp,max values >20% are projected.

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Temperature dependence of the key electro-optical characteristics for midinfrared emitting quantum cascade lasers

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