Abstract
Thermally activated longitudinal optical (LO) phonon scattering time (τthermal LO) of excited subbands in a 3.8 THz quantum cascade laser is studied. The active region used herein is based on a LO phonon depopulation scheme. A single plasmon waveguide was used for optical confinement. By calculating the temperature dependence of threshold current density (Jth) and comparing with the experiment, τthermal LO limiting the characteristic temperature of Jth is estimated: τthermal LO is 246 ns at 5 K, which rapidly decreases 15 ps when temperature rises up to 100 K.
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