Patent ID: 9203205
Filing Date: 2015-12-01
Classification: H01S

Abstract:
1. A fiber laser device comprising: a pumping light source configured to emit pumping light; an amplification optical fiber configured to amplify signal light by the pumping light and emit the signal light; a first FBG provided on one side of the amplification optical fiber and configured to reflect the signal light; a second FBG provided on the other side of the amplification optical fiber and configured to reflect the signal light at a reflectance lower than the first FBG; and a detecting unit configured to detect, among the light passed through the first FBG from the amplification optical fiber side, light in a specific wavelength range with priority to light at other wavelengths, wherein the specific wavelength range is a wavelength range between a wavelength 15 nm below and above a maximum reflection wavelength range, in which a reflectance of the first FBG is at the maximum.