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We report for the first time the possibility of co-extrusion of silver and potassium halide crystals to produce double-clad polycrystalline IR fibres. This combination allows the disadvantages inherent in each of the crystals separately to be overcome. The resulting fibres have stable long-term transmission and can be used to transmit CO2 laser radiation. The loss in the fibre at a wavelength of 10.6 μm constitutes 0.75 dB m−1.

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