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Mean index changes >10-3 were obtained in non-hydrogen-loaded 3% GeO2-doped silica fibers with a 9/40 micrometer core/cladding diameter using a cw 244-nm-Ar+-laser. Core stress changes are positive indicating a compaction contribution to the index change.
Tobias Kippenberg, Junqiu Liu, Maxim Karpov, Johann Emmeram Riemensberger, Anton Lukashchuk