OPTICAL FIBER FOR FIBER LASER, AND FIBER LASER USING THE SAME

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PROBLEM TO BE SOLVED : To provide an optical fiber for a fiber laser having high quality and high optical output, and capable of providing laser light in a single mode, and to provide a fiber laser. SOLUTION : In this optical fiber 2 for a fiber laser provided with a core with a rare-earth element added therein, and a cladding formed around the core and having a plurality of holes, and used for oscillating laser light by amplifying excitation light, a mode filter 6 is formed at a predetermined position in a longitudinal direction. COPYRIGHT : (C)2010, JPO&INPIT