Optical EngineeringTransport and gain in a quantum cascade laser: model and equivalent circuit
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A simple rate-equation-based model for transport and gain in quantum cascade lasers is developed. According to the model, the IV characteristics of a quantum cascade laser can be well described by equivalent circuit containing a serial connection of a Schottky diode, a tunnel diode, and a field-effect transistor. As a consequence, a quantum cascade laser can be described in terms accessible to circuit designers.