FIBER FOR FIBER LASER AND METHOD OF MANUFACTURING THE SAME, AND FIBER LASER

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PROBLEM TO BE SOLVED : To provide a fiber for a fiber laser capable of acquiring a high output laser beam without increasing an additive concentration of a rare earth element. SOLUTION : The fiber 1 for the fiber laser includes : a core 2 with the rare earth element added; and a clad 3 formed at the outer circumference of the core 2. The core 2 has a fictive temperature of 1, 720 to 2, 000°C. COPYRIGHT : (C)2010, JPO&INPIT