| 摘要 |
A fiber laser includes a light emitting unit that amplifies pulsed signal light in a rare-earth doped fiber and emits output light, and a filter arranged in an optical path of the output light emitted from the light emitting unit. The signal light is light having a longer wavelength than a wavelength with which a gain is maximized in a rare-earth doped fiber within a gain wavelength band of the rare-earth doped fiber. The filter does not allow transmission of light in at least a part of the wavelength band that includes the wavelength with which the gain is maximized in the rare-earth doped fiber, and allows transmission of light having the same wavelength as the signal light and light in a wavelength band on a longer wavelength side than the wavelength of the signal light. |
