Inter-Landau level scattering and LO-phonon emission in terahertz quantum cascade laser | Zendy

Nicolas PéréLaperne | Zendy; L. A. de Vaulchier | Zendy; Y. Guldner | Zendy; G. Bastard | Zendy; Giacomo Scalari | Zendy; Marcella Giovannini | Zendy; Jérôme Faist | Zendy; Angela Vasanelli | Zendy; Sukhdeep Dhillon | Zendy; Carlo Sirtori | Zendy

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Inter-Landau level scattering and LO-phonon emission in terahertz quantum cascade laser

Author(s) -

Nicolas PéréLaperne,

L. A. de Vaulchier,

Y. Guldner,

G. Bastard,

Giacomo Scalari,

Marcella Giovannini,

Jérôme Faist,

Angela Vasanelli,

Sukhdeep Dhillon,

Carlo Sirtori

Publication year - 2007

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 - 10.1063/1.2766862

Subject(s) - population inversion , phonon , terahertz radiation , physics , laser , quantum cascade laser , landau quantization , condensed matter physics , excited state , scattering , inelastic scattering , cascade , phonon scattering , population , magnetic field , atomic physics , optics , chemistry , quantum mechanics , demography , sociology , chromatography

A terahertz quantum cascade laser (QCL) structure based on a bound to continuum and LO-phonon extraction stage is studied under a strong magnetic field. Two series of power oscillations as a function of magnetic field are observed. Comprehensive simulations of the lifetimes allow the first series to be assigned to interface roughness (elastic) and the second to LO-phonon scattering (inelastic) of hot carriers in an excited Landau level, previously unobserved in terahertz QCL. The authors demonstrate that for the latter, the thermal electron distribution in the upper laser state leads to a breaking of the population inversion and hence laser action.

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