The potassium lithium borate glasses used in this work were prepared with the following composition in mol%, 20Li2O–10K2O–70B2O3:0.4Dy3+ and 20Li2O–10K2O–70B2O3:0.4Sm3+ by employing the melt-quenching technique, using high purity boric acid (H3BO3), lithium carbonate (Li2CO3), magnesium oxide (MgO), samarium(III) oxide (Sm2O5) as raw materials. All chemical mixtures were selected as a fine powdered with 99.99% purity. Before the process of melting, the powders were mixed and homogenized by milling the powders for 40 minutes. The homogenous mixture transferred to a platinum crucible and heated at 1200oC for one hour. After ensuring of homogeneity, the melt sample was poured onto a stainless steel plate for the produce glass sample. In addition, the glass was transferred to furnace for annealing at 400oC where it was kept for 3 hours to release any residual stress, which could cause loss of ductility of a material making it brittle.