A new type of middle-infrared optical fiber is proposed in which oxide glass is used as the cladding material to define a hollow core. Several kinds of oxide glasses have refractive indices lower than unity in the frequency range near 1000 cm−1 due to the nearby reasonance of molecular vibration; hence due to the total reflection of the incident laser light from air to the oxide-glass surface, it is expected that the hollow-core optical fiber made with the glass functioning as the cladding will exhibit small transmission loss. A preliminary experiment on a 1-mm-inner diam hollow-core Pb glass optical fiber shows its loss to be 7.7 dB/m at 940 cm−1 for CO2 laser light.
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Hidaka et al. (1981) studied this question.
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