This book provides a comprehensive, unified tutorial covering the most recent advances in the emerging technology of free-space laser communications (FSLC), where interest and attention continue to grow along with the number of technical challenges. This book is intended as an all-inclusive source to serve the needs of those who require information about the basics of FSLC, as well as up-to-date advanced knowledge of the state-of-the-art in the technologies available today. Topics covered include a combination of atmospheric effects for laser propagation and FSCL systems performance and design, and are intended as a valuable resource for engineers, scientists and students interested in better understanding laser communication systems designed for the atmospheric optical channel.