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A PbF2–AlF3 fluoride system has been vitrified in the shape of a ribbon using roller quenching over the composition range 30 to 60 mol% AlF3. The infrared absorption edge of the glass originates from the absorption band of AlF3 in PbF2 around a wavelength of 18 µm. The crystallization temperature is determined by DTA to be 280–350°C, and increases with increasing AlF3 content in the glass. The activation energy of crystallization is found to be about 80 kcal/mol for the PbF2–30 mol% AlF3 glass.

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We propose what is to our knowledge the first use of a Pr(3+)-doped fluoride fiber amplifier as a practical amplifier operating at the 1.3-microm band, based on a demonstration of signal amplification and a spectroscopic investigation. The feasibility of the fluoride fiber amplifier is confirmed.