Abstract
In this study we present a simulation model to optimize and engineer PbSe/Pb <sub>0.934</sub> Sr<sub>0.066</sub> Se quantum well laser structures which is a promising material system that has been used in IR Tunable Laser Spectroscopy. Four nanostructures were investigated: Single Quantum Well Lasers (SQW), Separate Confinement Heterostructure_Single Quantum Well Lasers (SCH_SQW), Multiple Quantum Well Lasers (MQW), and Modified Multiple Quantum Well Lasers (MMQW). We calculated the emitted wavelengths, the amount of optical energy that was confined in these structures, modal gain, total losses and the threshold current behavior as a function of laser cavity length and mirror reflectivity. The results showed that at low modal gain values, there are crossover points between the gain-current density curves for the four structures investigated. These points are crucial for determining the structure of choice with optimize and design parameters. The anisotropy in the constant energy surfaces and effects of non parabolic band structure for this system are included in the calculations. Finally, the theoretical model used in this research can be used with other material systems as a design and optimization tool for quantum well laser structures.
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