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Results on the inscription of Type IIA Bragg gratings in B-germanosilicate fibres using 248 nm, 500 fs laser radiation are presented. The gratings recorded exhibit index changes Deltan ap 10-3, while they remain intact for temperatures up to 650degC.
The spectral response of fiber Bragg gratings written with an ultrafast IR laser source is shown to be intensity dependent. This result suggests a different grating profile as a function of intensity.
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