BRAGG FIBER GRATING AND METHOD FOR MODIFYING REFRACTIVE INDEX OF BRAGG FIBER GRATING

摘要

PROBLEM TO BE SOLVED: To provide a Bragg fiber grating and a method for modifying the refractive index of the Bragg fiber grating which are used for simplifying a Raman fiber laser beam which irradiates with wavelengths of approximately 1.24 m and 1.48 m, and enhancing the efficiency of the radiation transformation of Raman scattering. SOLUTION: The Bragg fiber grating is that which is realized as a form of a part of a fiber optical waveguide based on SiO2 having a kind of impurity dopant GeO2 , and the refractive index of the core of the optical waveguide is varied along the length of the optical waveguide, and the Bragg fiber grating is characterized by the fact that the content of GeO2 is in the range of 11 to 39 mol%.