High pressure H 2 loading as a technique for achieving ultrahigh UV photosensitivity and thermal sensitivity in GeO 2 doped optical fibres

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Abstract
High pressure ‘hydrogen loading’ has been used to sensitise standard singlemode fibres, resulting in the largest reported UV induced index changes for low GeO2 fibres. Grating bandwidths of 4 nm and peak Δns of 5.9 × 10−3 have been reproducibly achieved. Substantial index changes have also been achieved by rapidly heating H2 loaded fibres of various compositions.