MULTIMODE OPTICAL FIBER, FIBER LASER AMPLIFIER, AND FIBER LASER OSCILLATOR

摘要

The core center region of a multimde core is doped with a gain medium which absorbs excitation light to generate a gain, and at least one of the core periphery region of the multimode core which contacts a clad and the clad center region of the clad which contacts the multimode core is doped with an absorption medium which absorbs signal light.