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Low-threshold quantum well lasers grown by metalorganic chemical vapor deposition on nonplanar substrates

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5 Author(s)
Dzurko, Kenneth M. ; Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA ; Menu, E.P. ; Beyler, C.A. ; Osinski, Julian S.
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Low-threshold quantum-well lasers having as-grown optical and electronic confinement fabricated by a single-step growth on nonplanar substrates are discussed. Several devices using various approaches for delineating narrow active regions by this technique are described. Fully planar index-guided arrays grown over a nonplanar substrate exhibit a threshold current of 8 mA per element. A technology called temperature engineered growth, which permits the formation of submicrometer active-region widths and wide contacting regions in the same growth step, is introduced. Lasers having active regions as narrow as 0.5 μm grown using this technology display stable single-transverse-mode operation. CW threshold currents as low as 2.5 mA at room temperature with differential quantum efficiencies of 34%/facet were measured for uncoated devices

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Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 6 )