Temperature dependence of the gain profile for THz quantum cascade lasers

Abstract

We study the rapid decrease of peak gain in resonant-phonon THz Quantum Cascade Lasers with increasing temperature. The effect of various microscopic scattering processes on the gain profile as a function of temperature is discussed. We argue that increased broadening, primarily due to increased impurity scattering, and not diminishing population inversion, is the main reason for the reduction of peak gain.

4 pages, 4 figures

References in corpus (5)

• Nonequilibrium Green's function theory for transport and gain properties of quantum cascade structures
• Quantum-mechanical wavepacket transport in quantum cascade laser structures
• Self-Consistent Theory of the Gain Linewidth for Quantum Cascade Lasers
• Quantum-transport theory for semiconductor nanostructures: A density-matrix formulation
• Density matrix theory of transport and gain in quantum cascade lasers in a magnetic field

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• Room temperature operation of n-type Ge/SiGe terahertz quantum cascade lasers predicted by non-equilibrium Green's functions
• Density matrix Monte Carlo modeling of quantum cascade lasers
• Temperature Dependence and Screening Models in Quantum Cascade Structure
• Temperature performance analysis of terahertz quantum cascade lasers: Vertical versus diagonal designs
• Analysis of High Performing Terahertz Quantum Cascade Lasers
• Modeling bound-to-continuum terahertz quantum cascade lasers: The role of Coulomb interactions