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Hofstetter, Daniel

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

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  • Publication
    Accès libre
    Distributed-feedback quantum cascade lasers emitting in the 9-μm band with InP top cladding layers
    (2002)
    Hofstetter, Daniel 
    ;
    Beck, Mattias
    ;
    Aellen, Thierry
    ;
    Faist, Jérôme
    ;
    Oesterle, Ursula
    ;
    Ilegems, Marc
    ;
    Gini Emilio
    ;
    Melchior, Hans
    Two different high performance quantum cascade distributed-feedback lasers with four quantum-well-based active regions and InP top cladding layers are presented. The first device, which emitted at 9.5 μm, was mounted junction down in order to get high average powers of up to 71 mW at -30°C and 30 mW at room temperature. The other device, which lased at 9.1 μm, was optimized for high pulsed operating temperatures and tested up to 150°C at 1.5% duty cycle. The emission of both lasers stayed single mode with more than 20-dB side-mode suppression ratio over the entire investigated power and temperature range.
  • Publication
    Accès libre
    High average power first-order distributed feedback quantum cascade lasers
    (2000)
    Hofstetter, Daniel 
    ;
    Aellen, Thierry
    ;
    Beck, Mattias
    ;
    Faist, Jérôme
    We present distributed feedback quantum cascade lasers at 965 cm-1 with a high average optical output power at temperatures of up to 60°C. At a duty cycle of 3%, the averaged maximal output power of a 55-μm wide and 1.5-mm-long device at -30°C was 13.6 mW; at 60°C, the device emitted 2 mkV. Corresponding peak optical powers of 450 mW at -30°C and of 70 mW at 60°C have been observed. Due to the lateral current injection, we achieved single-mode behavior in a slightly distorted zero-order lateral mode across the whole range of investigated temperatures and output powers. At room temperature, the threshold current density was on the order of 6.7 kA/cm2; the characteristic temperature T0 was, due to tuning of the Bragg resonance into the gain curve, rather high, namely 310 K.