Infrared optical constants for CO2 laser waveguide materials
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- Worrell, C.A. J Mater Sci (1986) 21: 781. doi:10.1007/BF01117354
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The infrared optical constants of a number of commercially available glasses and ceramics have been determined by Kramers-Krönig analyses of the reflectance spectra of the materials at near normal incidence. The data derived, the refractive indexn, and extinction coefficientK, have been further analysed to provide an assessment of these materials as hollow waveguides at mid-infrared frequencies. The results demonstrate that the frequency dependence of waveguide transmission is a feature of anomalous dispersion. Furthermore, in the case of beryllia and alumina ceramics, the high transmissions predicted in straight guide at 10.6μm can be attributed to the low refractive indices measured for these materials. Some experimental data are presented which substantiate the frequency characteristics of the predicted waveguide transmission.