Patent ID: 9350140
Filing Date: 2016-05-24
CPC Classification: H01S

Claim Text:
1. A quantum cascade laser comprising: a substrate having a first region and a second region arranged in a waveguiding direction; a stacked semiconductor layer disposed on the second region of the substrate, the stacked semiconductor layer including an active layer, the stacked semiconductor layer having a first end facet and a second end facet that constitute a laser cavity; an insulating layer disposed on the first end facet and an upper surface of the stacked semiconductor layer, the insulating layer having an opening on the upper surface of the stacked semiconductor layer; a conductive layer disposed on the insulating layer and in the opening, the conductive layer being in contact with the upper surface of the stacked semiconductor layer through the opening; and a metal layer disposed on the conductive layer on the first end facet and the upper surface of the stacked semiconductor layer, wherein the first end facet of the stacked semiconductor layer is retreated from an end facet of the substrate to a boundary between the first region and the second region of the substrate in the waveguiding direction.