GASB-CLAD MID-INFRARED SEMICONDUCTOR LASER

摘要

A semiconductor laser operating in the mid-infrared region is described. In one particular embodiment, the semiconductor laser is provided having first and second cladding layers consisting essentially of GaSb that surround an active core, wherein the index of refraction of the first and second cladding layers is less than but close to the index of refraction of active core. The semiconductor laser in accordance with this invention has a low divergence angle with a high power efficiency. In an alternate embodiment, the semiconductor laser is provided having first and second cladding layers consisting essentially of AlxGa1-xAsySb1-y that surround the active core with an aluminum mole fraction between 0 and 25 percent. The index of refraction of the first and second cladding layers consisting essentially of AlxGa1-xAsySb1-y can be adjusted to match a variety of types of active cores and to provide a pre-determined divergence.