| 摘要 |
A fiber laser device in the present invention comprises an excitation light source that emits excitation light and comprises a core and a non-circular cladding, an amplification light fiber that outputs laser light by absorbing the excitation light, an amplification coil having a configuration in which the amplification light fiber has been wound, a first reflection part provided on the inlet side of the amplification coil configured to reflect the laser light toward the amplification coil and a second reflection part provided on the emission side of the amplification coil that has a reflectivity lower than the reflectivity of the first reflection part and that is configured to reflect the laser light toward the amplification coil. Further, in the amplification coil, the wound amplification optical fiber is fixed and integrated by being wound in a twisted state in a circumferential direction of the amplification optical fiber around the central axis of the amplification optical fiber. |
