OPTICAL FIBER LASER LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber laser light source that has high output stability.

SOLUTION: The optical fiber laser light source includes: an input side filter film (7) disposed on an output side end face of an excitation light waveguide fiber (2) and forming an input side gap (N) to an input side end face of an amplified light waveguide fiber (3), and reflecting a predetermined wavelength band of light and transmitting a predetermined wavelength band of light; an output side half mirror film (8) disposed on an output side end face of the amplified light waveguide fiber (3) and forming an output side gap (S) to an input side end face of an output light waveguide fiber (4), reflecting a predetermined wavelength band of light and transmitting a predetermined wavelength band of light, and constituting a first optical resonator (K1) up to the input side filter film (7); and a fiber Bragg grating (14) disposed in the output light waveguide fiber (4) and constituting a second optical resonator (K2) up to the input side filter film (7). The input side gap (N) and the output side gap (S) have a distance (Ln) and a distance (Ls) of 20 μm or shorter, respectively. This structure provides high output stability.

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