Femtosecond dynamics of resonant tunneling and superlattice relaxation in quantum cascade lasers

Hyunyong Choi, Theodore B. Norris, Tobias Gresch, Marcella Giovannini, J́rôme Faist, Laurent Diehl, Federico Capasso

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Abstract

Time-resolved mid-infrared pump-probe measurements are performed on a quantum cascade laser below and above the threshold. The gain recovery is determined by the electron transport through the cascade heterostructure. Subpicosecond resonant tunneling injection from the injector ground state into the upper lasing state is found to be incoherent due to the strong dephasing in the active subband. The gain recovery due to transport through superlattice is interpreted in terms of dielectric relaxation within the superlattice miniband.

Original languageEnglish
Article number122114
JournalApplied Physics Letters
Volume92
Issue number12
DOIs
Publication statusPublished - 2008 Apr 3

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Choi, H., Norris, T. B., Gresch, T., Giovannini, M., Faist, J., Diehl, L., & Capasso, F. (2008). Femtosecond dynamics of resonant tunneling and superlattice relaxation in quantum cascade lasers. Applied Physics Letters, 92(12), [122114]. https://doi.org/10.1063/1.2898518