A significant reduction in the optical losses of AIF3-based, infrared transmitting fibres has been achieved for the first time. A minimum loss of 0.05dB/m at 2.65μm coupled with extended transparency beyond 4μm and excellent chemical durability makes these fibres excellent candidates for infrared sensing, remote spectroscopy, laser power delivery and active fibre research.
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Iqbal et al. (1991) studied this question.