The book "Design of a Laser Based Free Space Communication System" provides a comprehensive introduction to the science of wireless optical communication. It is divided into five chapters that cover various aspects of the topic. The first chapter offers a fundamental introduction to the subject, followed by theoretical concepts and standards in chapter two, which deals with point-to-point networks and the main types of transmission media in computer networks. Chapter three focuses on the experimental work and the design of the system, while chapter four presents the performance of the proposed system, calculations, results, and discussions. Finally, chapter five discusses the conclusions as well as suggestions for future work to improve system performance and features. This specialized book is aimed at students and professionals in the fields of mathematics, natural sciences, and astronomy who wish to engage with modern communication systems.