Semiconductor lasers possess unique features in terms of performance, size and impact, and user-friendliness. From a team of international experts, this book provides readers with a solid reference of the fundamentals of these devices through to the technologies and applications in bio-optics and biophotonics. It covers recent advances in semiconductor materials, visible and NIR lasers, LEDs, blue lasers, quantum cascade lasers, SDLs and their applications in photo-chemical applications, Near-Infrared Imaging, Raman spectroscopy, and optical coherence tomography.