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Nd doped phosphate glasses have been studied before and after gammairradiation in order to understand the effect of glass composition andradiation induced defects on the optical properties of glasses. UV, Visabsorption and photoluminescence spectra of these glasses are found stronglydependent on the composition of glass matrix, particularly on the ratio ofoxygen (O) and neodymium (Nd) concentration obtained from energy dispersiveX-ray spectroscopic (EDX) measurement. Gamma irradiation of glass modifies thetransmission below 700 nm due to generation of some new absorption bandscorresponding to different types of defects. Observations indicate towardpossibility of change in the valence state of Nd3+ to Nd2+ and generation ofoxygen vacancies in glass matrix. EDX and X-ray photoelectron spectroscopic(XPS) measurements indicate change in the composition of glasses particularlydecrease in the relative concentration of oxygen in glass samples after gammairradiation.

Study of gamma induced defects in Nd doped phosphate glass using UV-Vis spectrophotometer and photophysics beamline on INDUS-1