The book deals with the studies on "Microstructural, dielectric and spectroscopic properties of Li2O-Nb2O5-ZrO2-SiO2 glass system crystallized with CuO and V2O5 & Emission features of Nd3+ and Ho3+ ions in Li2O-Nb2O5/Ta2O5/La2O3-ZrO2-SiO2 glass systems". This work has been carried out in the Department of Physics, Acharya Nagarjuna University - Dr.M.R.A.R Campus, Nuzvid. The book contains the methods of preparation,characterization and studies on dielectric and spectroscopic properties including photo-induced second order susceptibility studies of Li2O-Nb2O5-ZrO2-SiO2 glass systems...