Ridge waveguide InGaN/GaN quantum dot edge emitting visible lasers

Authors

  • Animesh Banerjee,

    1. Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109-2122, USA
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  • Thomas Frost,

    Corresponding author
    1. Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109-2122, USA
    • Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109-2122, USA
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  • Shafat Jahangir,

    1. Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109-2122, USA
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  • Ethan Stark,

    1. Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109-2122, USA
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  • Pallab Bhattacharya

    1. Department of Electrical Engineering and Computer Science, Center for Photonics and Multiscale Nanomaterials, University of Michigan, Ann Arbor, Michigan 48109-2122, USA
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Abstract

Blue-emitting and green-emitting laser heterostructures were grown by molecular beam epitaxy, incorporating InGaN/GaN quantum dots as the active medium, with a measured quantum efficiency of 60% on n-GaN bulk substrates. These quantum dots exhibit no S-shape in the photoluminescence peak wavelength as a function of temperature, as typically found in comparable quantum well devices. The lasers were characterized by a threshold current density, Jth, of 930 A/cm2 under pulsed bias, with a differential efficiency of 13.9%, and a wall plug (power conversion) efficiency of 0.4% at 1050 A/cm2. Green-emitting quantum dot lasers have Jth = 935 A/cm2. The lasers were also characterized by their modal properties through near field imaging (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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