| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fiber laser device that can measure the power of emitted light even when light having large power is emitted.SOLUTION: A fiber laser device 1 comprises: an exciting light source 10 for emitting excited light; an amplifying optical fiber 30 for amplifying and emitting signal light based on the excited light; a first FBG 45 which is provided at one side of the amplifying optical fiber 30 and reflects the signal light; a second FBG 46 which is provided at the other side of the amplifying optical fiber 30 and reflects the signal light with a reflectivity lower than the first FBG 45; and a detector 71 for detecting, preferentially to light having the other wavelengths, light having a wavelength ranging from a wavelength 15-nm shorter than the maximum reflection wavelength band in which the reflectivity of the first FBG 45 is maximum to a wavelength 15-nm longer than the maximum reflection wavelength band, out of light transmitted from the amplifying optical fiber 30 side through the first FBG 45.</p> |
