Gain recovery dynamics of quantum cascade lasers

Abstract

We study the gain recovery dynamics of quantum cascade lasers when the operating conditions such as electric field and temperature vary. We find that gain becomes positive from negative and gradually increases as the applied electric field increases from zero. We also find that as the temperature increases, gain decreases with a reduction in the depletion of the gain when the pump pulse interacts. The recovery becomes faster with less coherent oscillations as the temperature increases.