Abstract
Bragg gratings are written with ultrafast 800 nm radiation and a phase mask through the polyimide polymer coatings of commercially available high NA fibres that are both unloaded and loaded with high pressure hydrogen gas. For polyimide coated fibres with very high germanium core concentrations, index modulations greater than 1×10−4 are induced. Stable core index modulations ∼60% of their original value were present after 115h at 500°C.
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