Abstract

The fabrication of Bragg reflectors in fluorine depressed cladding silicate glass and SMF-28 fibers by employing a double-phase mask interferometer and 248nm, 500fs laser radiation is demonstrated here. The maximum refractive index changes obtained were of the order of 6×104 for pulse intensities of 220GWcm2 and accumulated energy densities of 3.5kJcm2. 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 248nm photon at sub-TWcm2 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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