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

Hyunyong Choi | Zendy; Theodore B. Norris | Zendy; Tobias Gresch | Zendy; Marcella Giovannini | Zendy; Jérôme Faist | Zendy; Laurent Diehl | Zendy; Federico Capasso | Zendy

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

Author(s) -

Hyunyong Choi,

Theodore B. Norris,

Tobias Gresch,

Marcella Giovannini,

Jérôme Faist,

Laurent Diehl,

Federico Capasso

Publication year - 2008

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2898518

Subject(s) - dephasing , superlattice , lasing threshold , quantum tunnelling , femtosecond , laser , cascade , relaxation (psychology) , quantum well , optical pumping , condensed matter physics , ground state , materials science , optoelectronics , atomic physics , physics , chemistry , optics , psychology , social psychology , chromatography

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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