Kuantum kaskat lazerlerin karakteristik parametrelerinin üç boyutlu modellenmesi

Quantum cascade lasers (QCL) are semiconductor lasers that contain quantum wells. Quantum wells provide distinct quality for QCLs. Changing width of quantum wells cause to obtain different wavelengths for QCLs. QCLs have critical characteristic quantities such as optical gain, linewidth enhancement factor (LEF) and refractive index change. These parameters differ according to conditions. In this study; relating to injection current and wavelength the changes of optical gain, LEF (Alpha parameter) and refractive index change which are characteristic parameters of QCLs are modelled three dimensionally considering experimental values. Surface fitting techniques: regression analysis (lowest, polynomial) and method of least squares are applied to provide the optimal surface. Both the training and test results are used to obtain surface curves of characteristic quantities with minimum error. Except method of least squares, MATLAB program is used to find the surfaces and the errors of techniques. In this study, we present the best fitting technique to find the ideal parameters for each different QCLs' variables.