Abstract
A refractive-index grating was formed for the first time in a germanosilicate fibre by cw Ar+ laser radiation in the near-UV range (333–364 nm). The refractive index change induced in a fibre with 10 mol.% GeO2 in the core was 1.9 × 10-4 when the radiation power density was 1.7 × 105 W cm-2. The gratings formed in this way were as therma lly stable as those formed by KrF laser (248 nm) radiation.
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