High power diode lasers in mid-infrared spectral range have growing demand for a variety of applications including biological spectral analysis, remote sensing, medical diagnostic tools, and surgery instruments. The work presented in this book focuses on GaSb/AlGaAsSb/GaInAsSb material system for type-I diode lasers at the wavelength range above 3 μm. The new device design was proposed to reach desirable laser operation wavelength. Besides employing...