Abstract
Pure and Mg doped CaF2 single crystals grown by the Bridgman method were irradiated with gamma rays (γ-rays) for doses ranging from 97Gy to 9.72KGy. The pristine samples showed minimal absorption indicating the purity of the samples. The γ-irradiated pure CaF2 crystals showed prominent and strong absorption with a peak at ~374nm besides three weak ones at ~456, 523 and 623nm. However γ-rayed Mg doped crystals showed a prominent absorption with a strong peak at ~370nm and a broad one at ~530nm. The absorption indicated the generation of F and F-aggregate centers in the irradiated crystals. The photoluminescence (PL) emission spectrum of both pure and Mg doped crystals showed prominent emission at ~390nm when they were excited at ~250nm. Also, when the samples were excited at 323 and 363nm strong emissions were observed at ~430 and 422nm respectively. The optical absorption and PL intensities were found to increase with increase in dose.
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