Semiconductor lasers is an academic concept and research field dedicated to the study, design, fabrication, and application of laser devices utilizing a semiconductor material as the active gain medium. This area investigates the fundamental physics of light generation via stimulated emission within semiconductors under electrical or optical excitation, exploring device architectures, fabrication techniques, and performance optimization. Key characteristics explored include their compact size, high efficiency, direct electrical pumping, and wavelength versatility, underscoring their critical significance as essential components in telecommunications, data storage, sensing, and diverse industrial and medical technologies.