Two-well THz quantum cascade lasers with double extraction and injection

摘要

We present a two-quantum well THz intersubband laser operating up to 192 K.The structure has been optimized with a non-equilibrium Green's function model,as well as by experimentally measured devices, which both have converged on abest design featuring double extraction from the lower laser state, withsubsequent double injection into the upper laser level of the next period. Athigh temperature, the simulations indicate that lasing fails due to acombination of electron-electron scattering, thermal backfilling, and, mostimportantly, broadened re-absorption.