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

doi:10.1063/1.2898518

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

Department of Electrical and Electronic Engineering

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

25 Citations (Scopus)

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 language	English
Article number	122114
Journal	Applied Physics Letters
Volume	92
Issue number	12
DOIs	https://doi.org/10.1063/1.2898518
Publication status	Published - 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2898518

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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.",

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AU - Choi, Hyunyong

AU - Norris, Theodore B.

AU - Gresch, Tobias

AU - Giovannini, Marcella

AU - Faist, J́rôme

AU - Diehl, Laurent

AU - Capasso, Federico

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

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ER -

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

Abstract

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