Abstract

Absorption indices at a wavelength of 10.6 μm for thin films of As₂S₃, GeSe, BaF₂, ZnSe, and CdTe were measured by calorimetric techniques with a CO₂ laser. The values obtained, 4.6 × 10⁻⁴, 1.4 × 10⁻³, 2.8 × 10⁻³, 2.8 × 10⁻³, and 5.0 × 10⁻³, respectively, were significantly greater than the corresponding values for the bulk materials. This difference was least for the vitreous films, As₂S₃ and GeSe, which also had a lower absorption than the remaining polycrystalline films. Details are presented of the microstructure of the films as determined by scanning electron microscopy and x-ray diffraction.

© 1975 Optical Society of America

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