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Browsing by Author "Liu, Mei-Chung"

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    Temperature dependent gain characteristics in GaN-based vertical-cavity surface-emitting lasers
    (2009-10-26)
    Lu, Tien-Chang
    ;
    Cheng, Bo-Siao
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    Liu, Mei-Chung
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    光電工程學系
    ;
    Department of Photonics
    Temperature dependent gain characteristics and linewidth enhancement factor (alpha-factor) of vertical-cavity surface-emitting lasers with InGaN/GaN multiple quantum wells were studied by measuring the photoluminescence spectra below the threshold condition and analyzed by using the Hakki-Paoli method. The optical gain and differential gain showed a more rapid increase as a function of the injected carriers as temperature decreased. The alpha-factor for the lasing mode was estimated as 2.8 at room temperature and decreased to a value as low as 0.6 at 80 K. (C) 2009 Optical Society of America