Abstract
The fabrication of Bragg reflectors in fluorine depressed cladding silicate glass and SMF-28 fibers by employing a double-phase mask interferometer and , laser radiation is demonstrated here. The maximum refractive index changes obtained were of the order of for pulse intensities of and accumulated energy densities of . 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 photon at sub- 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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