The ongoing research in optical fiber laser technology represents an ever-evolving field, driven by the pursuit of enhanced performance and the creation of new generations of specialty optical fibers, including the exploration of novel materials and designs. This book comprises 20 chapters, dedicated to the recent advances in the field of optical fiber laser technology, ensuring a comprehensive coverage of this dynamic research area. The content reflects significant progress in various types of optical fiber lasers, addressing topics that range from fundamental principles to cutting-edge fabrication technologies, along with their wide-ranging applications. The findings and insights presented in this book serve to underscore the significance and potential of various kinds of optical fiber laser technology in modern science, paving the way for future advancements.