Double channel planar waveguides for quantum cascade lasers are represented two-dimensionally in the transverse plane. Thermal and optical simulations are implemented over a set of geometrical parameters pertaining to the active region of the laser. The process of fine-tuning of the simulation is discussed in the context of optical mode analysis. Spatial profiles of electric and magnetic fields for zero-order and first-order quasi-transverse-magnetic and quasi-transverse-electric modes are compared. A partially automated framework of extraction of the fundamental lasing mode is proposed. Limitations of simulation-based methods are discussed.
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