Abstract
One of the main causes of optical defects in ruby lasers is the segregation of chromium, which results in changes of the index of refraction and in divergence of the light beam. Here studies are being carried out, using the technique of contact autoradiography, on the segregation of chromium in ruby monocrystals obtained with the aid of Verneuille's method. The specimens for autoradiographic studies were activated in a nuclear reactor or labelled with 51Cr(51Cr-labelled γ-Al2O3). Autoradiograms of samples, cut out perpendicularly to the direction of growth of ruby monocrystals revealed the presence of concentration changes in the form of concentric rings. The autoradiography permits to carry out qualitative and quantitative evaluation of concentration changes of chromium. This technique can also be used for the examination of other optically active admixtures e.g. Nd.
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