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Employing an ensemble Monte Carlo transport simulation, we self-consistentlyanalyze the spectral gain for different THz quantum cascade laser structures,considering bound-to-continuum as well as resonant phonon depopulation designs.In this context, we investigate temperature dependent gain broadening,affecting the temperature performance of THz structures. Furthermore, wediscuss the influence of the individual scattering mechanisms, such aselectron-electron, impurity and interface roughness scattering. A comparison ofthe simulation results to experimental data yields good agreement.

Monte-Carlo-based spectral gain analysis for THz quantum cascade lasers