Abstract
This paper reports a study of the structure and optical spectra of glass–ceramics of the potassium–zinc–aluminosilicate system doped with Er3+ ions and containing ZnO nanocrystals. The volume fractions and sizes of the crystals are determined, the optical-density spectra are recorded, and the extinction-coefficient spectra are obtained for glass–ceramics created as a result of a series of successive isothermal heat treatments at 720°C and 750°C. The extinction coefficient is resolved into two terms, one of which describes the extinction caused by the presence of free carriers in the ZnO semiconductor crystals, while the second term describes the scattering and intrinsic absorption of light by these crystals. It is shown that the light scattering has an anomalous character: the dependence of the scattering coefficient on the inverse wavelength is described by a power function with an exponent that substantially exceeds the Rayleigh value of 4, while the measured scattering coefficient is appreciably less than that calculated for independent Rayleigh scatterers.
© 2021 Optical Society of America
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