This book provides a comprehensive overview of the latest achievements in the field of optical fiber lasers, covering the basics, technology, and numerous applications. Optical fiber lasers are key in a variety of scientific, military, medical, industrial, and commercial spheres, and therefore have undergone rapid innovation. Each chapter highlights a novel development in refining fiber laser features such as the output lasing wavelength, output power, nature of the laser beam, nature of the output laser pulse, design of lasing cavity, and design of fiber structure. These improvements are then applied to a wide variety of lasers, including Raman fiber lasers, gas-filled fiber lasers, rare-earth doped fiber lasers, and more. This book also sheds light on the rise in AI-enabled fiber laser systems in industrial manufacturing. The in-depth coverage of the latest developments in various kinds of optical fiber laser technology ensure this volume will serve as a valuable resource for graduate students, engineers, and scientists both experienced and new to the field.