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Hofstetter, Daniel

Nom
Hofstetter, Daniel
Affiliation principale
Fonction
Ancien.ne collaborateur.trice
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https://libra.unine.ch/handle/123456789/472

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  • Publication
    Accès libre
    Bound-to-continuum and two-phonon resonance, quantum-cascade lasers for high duty cycle, high-temperature operation
    (2002)
    Faist, Jérôme
    ;
    Hofstetter, Daniel 
    ;
    Beck, Mattias
    ;
    Aellen, Thierry
    ;
    Rochat, Michel
    ;
    Blaser, Stéphane
    Recent advances in quantum-cascade (QC) laser active-region design are reviewed. Based on a rate equation model of the active region, we show why new gain regions. based on a two-phonon resonance or a bound-to-continuum transition exhibit significantly better performance than the traditional design based on a three-quantum-well active region. Threshold current densities as low as 3 kA/cm2 at T = 300 K, operation with a peak power of 90 mW at 425 K, single-mode high-power operation up to temperatures above 330 K at λ ≈ 16 μm and continuous wave operation up to T = 311 K are demonstrated. QC lasers able to operate at high duty cycles (50%) on a Peltier cooler were used in a demonstration of a 300-MHz free-space optical link between two buildings separated by 350 m.
  • Publication
    Métadonnées seulement
    Bound-to-continuum and two-phonon resonance quantum-cascade lasers for high duty cycle, high-temperature operation
    (2002)
    Faist, Jérôme
    ;
    Hofstetter, Daniel 
    ;
    Beck, Mattias
    ;
    Aellen, Thierry
    ;
    Rochat, Michel
    ;
    Blaser, Stéphane
    Recent advances in quantum-cascade (QC) laser active-region design are reviewed. Based on a rate equation model of the active region, we show why new gain regions based on a two-phonon resonance or a bound-to-continuum transition exhibit significantly better performance than the traditional design based on a three-quantum-well active region. Threshold current densities as low as 3 kA/cm(2) at T = 300 K, operation with a peak power of 90 mW at 425 K, single-mode high-power operation up to temperatures above 330 K at lambda approximate to 16 mum and continuous wave operation up to T = 311 K are demonstrated. QC lasers able to operate at high duty cycles (50%) on a Peltier cooler were used in a demonstration of a 300-MHz free-space optical link between two buildings separated by 350 m.
  • Publication
    Accès libre
    A quantum cascade laser based on an n-i-p-i superlattice
    (2000)
    Faist, Jérôme
    ;
    Müller, Antoine
    ;
    Beck, Mattias
    ;
    Hofstetter, Daniel 
    ;
    Blaser, Stéphane
    ;
    Oesterle, Ursula
    ;
    Ilegms, Marc
    We demonstrate a quantum cascade laser with a novel injection concept. Periodic insertion of silicon- and beryllium-doped layers are used to control locally the internal electric field in the active region. This concept is demonstrated experimentally using an active region based on a periodic superlattice.