Heat transfer speed and phonon related phenomena in terahertz quantum cascade lasers

摘要

We report on the measurement of both transverse and in-plane heat transfer speed in GaAs/AlGaAs quantum cascade lasers via time-resolved micro-probe photoluminescence. We found approximately a one order of magnitude reduction in the heat transverse speed with respect to bulk values that we ascribed to the heat interface boundary resistance. We also compared the non equilibrium population of phonons via anti-Stokes Raman scattering in different active region configurations.