Patent ID: 6819696
Filing Date: 2004-11-16
Classification: B82Y,H01S

Abstract:
A method for enhancing phonon assisted transitions in a semiconductor device comprising:forming an active quantum well structure containing a final electron energy subband for an optical lasing transition and a drain quantum well structure for collecting electrons after a lasing transition; injecting carriers into the active quantum well structure which emit laser photons as the carriers transition from a higher energy subband to the final energy subband within the active quantum well; depopulating the carriers from the final energy subband of the active quantum well structure to an energy subband of the drain quantum well structure; and transitioning the carriers from the energy subband of the drain quantum well structure to a lower energy subband within the drain quantum well structure separated in energy from the energy subband of the drain quantum well structure by at least one quantum of optical phonon energy to thereby emit laser photons.