抄録
Fiber lasers are promising for industrial applications because they excel in beam quality, efficiency, compactness, and ruggedness. However, even in the double-clad geometry, the power scalability is severely limited with the end-pumping technique. Indeed, the end faces of an optical fiber offer only a small area and this makes it difficult to launch the pump light from the many high power diode lasers. To solve this pump source multiplexing problem we researched and developed the fiber laser in original which was called “Fiber structure type fiber laser”. The disk-shaped, fiber-structure type fiber laser that we developed provides an average output of 1 kW (total output at both ends) and a laser efficiency (electric-to-optical) of 15.6 %. As the fiber laser except for the bundled type, the average output 1 kW is the highest value as long as we know.
