FIBER LASER APPARATUS, AND METHOD OF DETECTING ABNORMALITY OF FIBER LASER APPARATUS

摘要

It is an object of the invention to positively detect a failure that has occurred in a fiber. A fiber laser apparatus 1 in which pump light is introduced into an optical fiber to generate laser light is characterized by including a detecting section (PD 50) that detects signal light leaking out from a core of the optical fiber as leakage signal light, a determining section (control unit 40) that determines that, in a case where there is a decrease in an intensity of the leakage signal light detected in the detecting section, a failure of the fiber has occurred, and a stopping section (pumping LD driving power source) that stops, in a case where the determining section has determined that a failure of the fiber has occurred, the introduction of the pump light into the optical fiber.