| 摘要 |
PROBLEM TO BE SOLVED: To provide a fiber laser device which can emit light of a desired wavelength.SOLUTION: A fiber laser device 1 includes an optical fiber 10 for amplification, an excitation light source 20 outputting exciting light for exciting an active element of the optical fiber 10 for amplification, a first mirror provided on one side of the optical fiber 10 for amplification, and a second mirror provided on the other side of the optical fiber 10 for amplification. When a loss of light between the first and second mirrors is equal to a gain of light in the optical fiber 10 for amplification, the difference of a gain in the optical fiber 10 for amplification at a wavelength of the largest gain, and a gain at the wavelength of light reflected by the first and second mirrors is 35 dB or less. |
