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The fifteen-unity coupled ridge waveguide quantum cascade laser (QCL) arrays integrated in parallel were present. In-Phase mode of operation is provided by both the index-guided nature and the strong coupling between lasers inherent in this structure. Single-lobe lateral far-field with a nearly diffraction limited beam pattern was obtained. The simplicity of this structure and fabrication process...
We use Candela CS20 optical surface analyzer to detect micropipe and downfall defects of 4H-SiC epilayers grown on 3-inch 4H-SiC substrates. Although both micropipes and downfalls appear as growth pits with different sizes in the topographic image, the micropipes are found to have a signature of bright elongated streaks in the scattered light image. Using this unique feature, the micropipes are distinguished...
High-power strain-compensated In1-xGaxAs/In1-yAlyAs quantum cascade lasers (lambda~5.5 mum) are demonstrated. Peak power at least 1.2 W per facet for a 32 mum times 2 mm uncoated laser stored in ambient condition for 240 days, is obtained at 80 K. Considering the collection efficiency of 60%, the actual output power is 4 W at this temperature.
InAlGaN quaternary alloys were grown on nitrided sapphire, AlN nuclear layer and GaN layer by radio-frequency plasma-excited molecular beam epitaxy (RF-MBE). Reflection high-energy electron diffraction (RHEED), Rutherford back-scatter spectrometry (RBS), atomic-force microscopy (AFM) and high resolution X-ray diffraction (HRXRD) were used to characterize the InAlGaN alloys. Different buffer layers...
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