Abstract
Pure and Ytterbium (Yb) doped Calcium fluoride (CaF 2) single crystals were irradiated with 100 MeV Ni 7+ ions for fluences in the range 5 × 10 11–2.5 × 10 13 ions cm −2. The irradiated crystals were characterized by Optical absorption (OA) and Thermoluminescence (TL) techniques. The OA spectra of ion irradiated pure CaF 2 crystals showed a broad absorption with peak at ∼556 nm and a weak one at ∼220 nm, whereas the Yb doped crystals showed two strong absorption bands at ∼300 and 550 nm. From the study of OA spectra, the defect centers responsible for the absorption were identified. TL measurements of Ni 7+ ion irradiated pure CaF 2 samples indicated a strong TL glow with peak at ∼510 K. However, the Yb doped crystals showed two TL glows at ∼406 and 496 K. The OA and TL intensity were found to increase with increase of ion fluence upto 1 × 10 13 ions cm −2 and thereafter it decreased with further increase of fluence. The results obtained are discussed in detail.
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