Designs for a quantum cascade laser using interband carrier extraction

We have performed band structure calculations on intersubband cascade lasers using interband extraction, based on type II InAs/GaSb superlattices. The band structure under high electric field biasing was calculated using four-band k·p theory. We show that the broken gap system should enable emission beyond View the MathML source without leakage of carriers from the active well. Design of the structures allows us to enhance or suppress electric field tunability.