Температурная зависимость выходной мощности терагерцовых квантово-каскадных лазеров на основе резонансно-фононного дизайна

Abstract

We have designed and fabricated terahertz quantum cascade lasers (THz QCL) based on GaAs/Al0.15Ga0.85As three and four-quantum well active module with resonant-phonon depopulation scheme. Three-well and four-well THz QCLs have a lasing frequencies of 3.2 and 2.3 THz, respectively. We investigate the dependence of threshold current and lasing output power on temperature. The investigation of temperature degradation in THz QCLs shows that the thermally activated longitudinal optical-phonon scattering is the dominant mechanism.