Abstract
We present the design and optimization of a deep-well GaAs-based quantum cascade laser (QCL) emitting at 6.7 μm, the shortest wavelength in GaAs-based QCLs, using a multivalley Monte Carlo simulation. Simulation results provide direct insights into optimizing the layer sequence design. The optimized structure exhibits sufficient gain for lasing at both 77 and 300 K. The calculated threshold-current densities are 5 kA/cm2 at 77 K and 14 kA/cm2 at 300 K.
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