| 简介 |
PROBLEM TO BE SOLVED : To provide an optical fiber laser capable of highly efficiently conducting a side excitation of a double clad fiber.
SOLUTION : The optical fiber laser includes an optical fiber 21 having clads 23 in the periphery of a core 22 with rare-earth element added, and an excitation light source for entering the excitation light from the side surface of the optical fiber 21. The optical fiber 21 has a concavo-convex shape along the outer circumferential part of the clad 23 in a longitudinal direction, and the clads 23 are winded and focussed as their sides mutually contact.
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