This book discusses several topics associated with different laser systems intended for applications in science and numerous industries. Some of them are latest achievements in laser physics, while others face renewal in industrial applications. The book consists of information regarding various topics like laser beam manipulation, intense pulse propagation phenomena, metrology and laser and terahertz sources which are further diversified into topics like mode-locking, micro-lasers, q-switching, pulse and beam shaping technologies, enhancement methodologies, etc. It will serve as an excellent beginning point for students of laser physics and assist them through the elucidative information encompassed in this book.