Fiber lasers, as a dark horse among the new types of lasers, have always received significant attention from the industry. Due to the small core diameter of the fiber, it is easy to achieve high power density within the core. As a result, fiber lasers have high conversion rates and high gains. By utilizing fiber as the gain medium, fiber lasers have a large surface area, which enables excellent heat dissipation. Consequently, they have higher energy conversion efficiency compared to solid-state and gas lasers. In comparison to semiconductor lasers, the optical path of fiber lasers is entirely composed of fiber and fiber components. The connection between fiber and fiber components is achieved through fusion splicing. The entire optical path is enclosed within the fiber waveguide, forming a unified structure that eliminates component separation and greatly enhances reliability. Furthermore, it achieves isolation from the external environment. Moreover, fiber lasers are capable of ope...