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Results are reported of reflectivity and complex refractive-index measurements performed on a number of samples of oxide glasses (SiO2 and GeO2 with different dopings) to be used as cladding materials in hollow-core fibers for medium IR and in particular CO2 laser radiation transmission. GeO2 glasses are more convenient for guidance of CO2 radiation at λ = 10.6 μm, while comparable results can be obtained with SiO2 glasses with 27.8% doping for λ ~ 9.2 μm.
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Scheggi et al. (1985) studied this question.
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