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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
    Métadonnées seulement
    Edge- and surface-emitting 10.1
    (2000)
    Hofstetter, Daniel 
    ;
    Faist, Jérôme
    ;
    Beck, Mattias
    ;
    Muller, Antoine
    ;
    Oesterle, Ursula
    We present measurement results on high-power low-threshold quantum cascade-distributed feedback lasers emitting infrared radiation at 10.16 mu m. A lateral current injection scheme allowed the use of a strongly coupled surface grating without metal coverage and epitaxial re-growth. Although this design resulted in a simplified processing, the fabrication of high-performance edge- and surface-emitting devices was demonstrated. For the edge-emitting laser, we used a standard first-order grating with a period of 1.57 mu m, and for the surface emitter, a second-order grating with a period of 3.15 mu m was used. Maximal output powers in excess of 200 mW at 85 K and 70 mW at 300 K were achieved for both configurations. The threshold current densities at 85 K (300 K) were 1.85 kA/cm(2) (5.4 kA/cm(2)) and 2.1 kA/cm(2) (5.6 kA/cm(2)) for edge and surface emitters, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.
  • Publication
    Métadonnées seulement
    Surface-emitting 10.1
    (1999)
    Hofstetter, Daniel 
    ;
    Faist, Jérôme
    ;
    Beck, Mattias
    ;
    Oesterle, Ursula
    We present measurement results on a surface-emitting quantum-cascade distributed feedback laser emitting infrared radiation at 10.1 mu m. The use of a second order grating enabled the laser to emit about 25% of its total optical power from the grating. The beam radiated from the grating was at a very low divergence angle of about 1 degrees x14 degrees. As already presented in a previous paper, we simplified the processing by using a lateral current injection scheme avoiding epitaxial regrowth. At 85 K, the laser emitted 210 and 60 mW of pulsed power from facet and grating, respectively; at room temperature, the corresponding numbers were 70 and 18 mW. Threshold current densities of 2.1 kA/cm(2) at 85 K and 5.6 kA/cm(2) at room temperature were observed. The device showed single mode behavior for the entire temperature range and all investigated power levels. In addition, a constant temperature tuning coefficient of 0.06 cm(-1)/K was seen. (C) 1999 American Institute of Physics. [S0003-6951(99)04350-8].
  • Publication
    Métadonnées seulement
    Demonstration of high-performance 10.16
    (1999)
    Hofstetter, Daniel 
    ;
    Faist, Jérôme
    ;
    Beck, Mattias
    ;
    Muller, Antoine
    ;
    Oesterle, Ursula
    We present measurement results on high-power low threshold quantum cascade distributed feedback lasers emitting infrared radiation at 10.16 mu m. A lateral current injection scheme allowed the use of a strongly coupled surface grating without metal coverage and epitaxial regrowth. Although this design resulted in a simplified processing, the fabrication of high performance devices was demonstrated. The laser emitted 230 mW of pulsed power at 85 K, and 80 mW at room temperature. Threshold current densities of 1.85 kA/cm(2) at 85 K and 5.4 kA/cm(2) at room temperature were observed. Since the spectrum showed single mode behavior for all temperatures and power levels of the operating range, this device will be ideal for optical sensor applications. (C) 1999 American Institute of Physics. [S0003-6951(99)01931-2].