The fabrication of Bragg reflectors in fluorine depressed cladding silicate glass and SMF-28 fibers by employing a double-phase mask interferometer and $248\mathrm{nm}$ , $500\mathrm{fs}$ laser radiation is demonstrated here. The maximum refractive index changes obtained were of the order of $6\times {10}^{-4}$ for pulse intensities of $220\mathrm{GW}∕{\mathrm{cm}}^2$ and accumulated energy densities of $3.5\mathrm{kJ}∕{\mathrm{cm}}^2$ . The Bragg gratings fabricated in the F-doped fiber endured temperatures greater than 700°C, while those inscribed in the standard telecom fiber demarcated at 900°C. The experimental results presented depict that the combination of the two phase mask interferometer and the $248\mathrm{nm}$ photon at sub- $\mathrm{TW}∕{\mathrm{cm}}^2$ intensities constitute an efficient route in the fabrication of Bragg gratings in low-defect silicate glass optical fibers.

© 2008 Optical Society of America

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