Abstract
The mechanisms of formation and erasure of holographic gratings recorded in calcium fluoride crystals with a low sodium content have been considered. It is found that in the case of recording by UV radiation, an effective holographic grating is formed due to the spatial modulation of the colloidal centers arising under the action of the radiation at temperatures about 200°C. The decisive role of photoinduced diffusion of anion vacancies in this modulation is demonstrated.
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