Patent ID: 8514902
Filing Date: 2013-08-20
Classification: B82Y,H01S

Abstract:
1. A quantum cascade laser comprising one or more p-type electrical isolation regions and a plurality of electrically isolated laser sections extending along a waveguide axis of the laser, wherein: the quantum cascade laser comprises an active waveguide core sandwiched between upper and lower n-type cladding layers; the active core and the upper and lower n-type cladding layers extend through the electrically isolated laser sections of the quantum cascade laser; a portion of the upper n-type cladding layer comprises sufficient p-type dopant to define a p-type electrical isolation region that extends across at least a part of the thickness of the upper n-type cladding layer along a projection separating the electrically isolated laser sections of the quantum cascade laser; and the core layer comprises alternating semiconductor layers that are configured to amplify light emitted due to carrier transitions between energy states within the same energy band.