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

Abstract : A Terahertz Quantum Cascade Laser (THz 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. We 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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https://hal.archives-ouvertes.fr/hal-00156810
Contributor : Louis-Anne de Vaulchier <>
Submitted on : Friday, June 22, 2007 - 4:30:57 PM
Last modification on : Tuesday, September 22, 2020 - 3:58:05 AM
Long-term archiving on: : Monday, September 24, 2012 - 10:16:09 AM

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  • HAL Id : hal-00156810, version 1

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Nicolas Péré-Laperne, Louis-Anne de Vaulchier, Yves Guldner, Gérald Bastard, Giacomo Scalari, et al.. Inter-Landau level scattering and LO-phonon emission in Terahertz quantum cascade laser. Applied Physics Letters, American Institute of Physics, 2007, 91, pp.062102. ⟨hal-00156810⟩

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