Abstract
Strong (>20 dB) long-period fibre gratings were fabricated by combining F/sub 2/-laser photosensitivity-locking of hydrogen-soaked telecommunication fibre and KrF-laser grating formation. The 157 nm pretreatment permanently enhances the fibre photosensitivity response to the low-energy 248 nm photons. Thermal annealing at 120/spl deg/C for 24 h improves the grating stability without diminishing the enhancement.
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