Patent ID: 7983317
Filing Date: 2011-07-19
Classification: B82Y,H01S

Abstract:
1. A multi-quantum well laser diode comprising a laser substrate, a semiconductor active region, a waveguide region, and a cladding region, wherein: the active region comprises at least one active MQW region and at least one passive MQW region; the active MQW region is configured for electrically-pumped stimulated emission of photons; the passive MQW region is optically transparent at the lasing photon energy of the active MQW region; each of the MQW regions comprises a plurality of quantum wells and intervening barrier layers of barrier layer thickness a; each of the MQW regions is positioned in a plane that is displaced from and parallel to planes of adjacent MQW regions; adjacent MQW regions are separated by a spacer layer of spacer thickness b; the spacer thickness b is larger than the barrier layer thickness a; the bandgap of the quantum wells is lower than the bandgap of the intervening barrier layers and the spacer layer; and the respective active, waveguide, and cladding regions are formed as a multi-layered diode over the laser substrate such that the waveguide region guides the stimulated emission of photons from the active region, and the cladding region promotes propagation of the emitted photos in the waveguide region.