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Transmission losses induced by ionising radiation in fibre opties having cores drawn from pure synthetic silica may be reduced by pre-exposure to large hardening doses. Characteristics of the hardened fibres are described and the necessary features of the hardening irradiations identified.
Transmission losses produced in fibre-optics by ionising radiation may be annealed by the signal light. Results are presented for the dependence of the effect on the light power level and its wavelength. Losses which are thus annealed appear to be related to strain in the fibre.
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