OPTICAL FIBER LASER DEVICE

摘要

A fiber laser device for generating a laser beam using an amplifying optical fiber for the amplification medium in a laser oscillator, wherein the optical fiber laser device is provided with: an outputting optical fiber for emitting the laser beam to the exterior; a returning-light-attenuating unit for attenuating returning light that propagates through at least the outputting optical fiber in a direction opposite to the direction of the laser beam; a heat conversion means for converting the returning light into heat, the heat conversion means being provided on the returning-light-attenuating unit; a temperature-monitoring means for measuring the increase in temperature in the returning-light-attenuating unit as caused by the heat emitted by the heat conversion means; and a control unit for lowering or stopping the output of the laser beam when the temperature measured by the temperature-monitoring means reaches at least a predetermined threshold.