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Temperature maps of laser diode facets obtained by photothermal reflectance microscopy are presented. Biased double heterojunction InGaAsP lasers were investigated. The temperature images reveal the influence of laser mode on the spatial distribution of the heat dissipation in the device. Moreover, a study of the modulated reflectance as a function of the injection current is achieved.
Inspec keywords: reflectivity; laser modes; temperature measurement; gallium arsenide; indium compounds; distributed feedback lasers; photothermal effects; semiconductor lasers; laser variables measurement; III-V semiconductors; gallium compounds; temperature distribution
Other keywords:
Subjects: Semiconductor lasers; Laser beam modulation, pulsing and switching; mode locking and tuning; Thermal variables measurement; Lasing action in semiconductors; Thermometry; Thermal instruments and techniques