"Semiconductor Optics" is to explain the optical properties of semi-conductors, e.g., the spectra of transmission, reflection and luminescence, or of the complex dielectric function in the infrared, visible and near-ultraviolet part of the electromagnetic spectrum. The book includes Maxwell’s equations and concept of photons, interaction of light with matter, ensemble of uncoupled oscillators, the concept of polaritons et al. The book wants to evoke in the reader a clear and intuitive understanding of the physical concepts and foundations of semiconductor optics and of some of their numerous applications. The textbook is not only suitable for graduate and postgraduate students of physics, but also for students of neighboring disciplines, such as materials science and electronics.