Analysis of the thermal properties of GaInAs Quantum Cascade

Analysis of the thermal properties of GaInAs
Quantum Cascade Laseres
O. Concepción, A. Abelenda and M. Sánchez
Facultad de Física, Universidad de La Habana, Cuba
A model to study the thermal properties of GaInAs/AlInAs quantum
cascade lasers (QCLs) is presented. The temperature distribution is
obtained by solving the heat conduction equation using the finite difference
method and a two-dimensional anisotropic heat-flow model in a typical
structure. The simulation was performed in Comsol Multiphysics
considering as the main heat sources, the phonon scattering at the layer
boundaries and Joule heating. The thermal resistance was calculated and
compared with experimental results reported by other authors, obtaining a
good agreement.
A comparison of the distribution temperature among currently know
quantum cascade laser designs (ridge, double channel and buried) was done
analyzing the influence of the design parameters such as the thickness of
the insulator layer, the distance between the channels and the total width of
the device. The results show that buried structure is more efficient in heat
dissipation; however, with suitable design much simpler, in a dual-channel
structure, you can obtain a similar thermal behavior.