CARRIER ENERGY RELAXATION IN MULTISUBBAND QUANTUM-WELL LASERS WITH HOT PHONON EFFECTS

Carrier energy relaxation rates via carrier-polar optical-phonon inter actions with hot phonon effects are theoretically studied in multisubb and quantum well structures. The effects of changing the width and dep th of quantum wells on the carrier energy relaxation rate are discusse d. Compared to the result of the bulk, we find that the difference in the energy relaxation rate between quantum wells and bulk is rather sm all. Reducing the lifetime of longitudinal-optical phonons will effect ively enhance the carrier energy relaxation rate. The implications in designing high-speed quantum well lasers are also suggested.