Spectroscopic studies of γ-rayed CaF2:Sr

Optical absorption spectra of gamma irradiated (γ-rayed) Strontium (Sr) doped Calcium fluoride (CaF2) single crystals showed a prominent absorption peak at ∼370 nm and two weak ones at ∼463 and 524 nm. At higher γ-dose the two weak peaks merged into a broad one at ∼520 nm. The Photoluminescence (PL) spectra showed a prominent emission at ∼394 nm when the crystals were excited at ∼240 nm. The excitation of samples at 370 nm showed strong emission at ∼530 nm with a shoulder at ∼465 nm. The optical absorption and PL intensities were found to increase with γ-dose. However, the optical absorption and PL intensities of CaF2:Sr are found to be less than those of undoped CaF2 single crystals