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In this paper, we compare theoretically, as well as experimentally, four constructions of quantum well (QW) AlGaAs/InGaAs/GaAs semiconductor lasers: one standard, simple separate confinement heterostructure (SCH) laser and three different GRIN SCH (graded index separate confinement heterostructure) lasers. By optimising the construction and technology of epitaxy, an increase of laser quantum efficiency...
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