In the early 1960s, transparency which was sufficiently good, so that imaging through short path lengths was possible, was observed in certain glass-ceramic materials [1] and this eventually led to a commercial cookware application. This work was instrumental in the subsequent discovery of many new transparent glass-ceramic systems [2-29]. However, scattering in most of these new compositions is too large to be practical for optical devices. The turbidity in these systems is well described by Rayleigh Ganz particle scattering the ory, where the most important factors for achieving high transparency are a crystal size that is much smaller than the wavelength of the incident light and a small refractive index difference between the crystal and matrix glass phases.
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