Photorefractivity in GeO2-doped silica fibers

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Abstract
Photorefractivity has been observed in several GeO2‐doped fibers. The effect is manifested by formation of a grating in the fiber core introduced by laser radiation in the green part of the spectrum. The grating is a distributed Bragg reflector which selectively reflects light at the writing wavelength. Reflections of up to 50% in a 15 cm length of fiber have been observed. The grating persists for at least five days after being written.