FIBER LASER DEVICE

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PROBLEM TO BE SOLVED : To provide a fiber laser device capable of suppressing an output of excitation light. SOLUTION : The fiber laser device 100 includes an optical fiber 30 for amplification which receives excitation light, to which a rare-earth element to be excited by the excitation light is added, and which outputs the excitation light and a laser beam amplified by the excitation light, an optical fiber 40 for receiving the laser light and the excitation light outputted from the optical fiber 30 for amplification and outputting the laser beam and the excitation light from the output end 45, a glass rod 50 for receiving the laser beam and the excitation light outputted from the output end 45 of the optical fiber 40, and an optical filter 60 arranged on the output end surface 52 of the glass rod 50 for transmitting the light of a wavelength band being the same as that of the laser beam and reflecting the light of the wavelength band being the same as that of the excitation light. The excitation light inputted to the glass rod 50 is inputted to the optical filter 60 from a direction vertical to the output end surface 52. COPYRIGHT : (C)2011, JPO&INPIT