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## Print version ISSN 0035-001X

#### Abstract

SANTIAGO NUNEZ, I.; SHLYAGIN, M.G.  and  BELTRAN-PEREZ, G.. Cinética inicial de formación de rejillas de Bragg en fibras ópticas estándar. Rev. mex. fis. [online]. 2017, vol.63, n.2, pp.124-129. ISSN 0035-001X.

Results on experimental study on kinetics of fiber Bragg gratings formation in the standard telecom optical fiber SMF-28 at initial stage of irradiation are presented. For low fluence per pulse, it was found that the fast formation of color centers Ge(1) is a dominant mechanism of the refractive index change at initial stage for accumulated fluence of below 0.02 J/cm2 at the wavelength of 266 nm. At low fluence per pulse, the induced change of the refractive index does not depend on UV light intensity and saturates at a level of $\sim 2×{10}^{-6}$. Dominance of the Ge(1) color center mechanism in the FBG formation at the initial stage makes possible a cost-effective recording of large arrays of weak FBGs for sensors utilizing lasers of low energy per pulse.

Keywords : Bragg gratings; photosensitivity; color centers; sensor.

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