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Lithium-Borate glasses medium doped Erbium (Er 3+ ) active ion have been prepared by melting-quenching technique. The glasses medium followed composition (mol%): 65 – x)B 2 O 3 - 5ZnO - 5Li 2 O - 15 Na 2 O - 10PbO - xEr 2 O 3 (with  x = 0; 0,05; 0,1; 0,5; 1,0; 2,0 dan 4,0 mol%). Sample with powder form are mixed in the crucible alumina and melted at temperature 1200 o C by using of electrical furnance. After poured in to stainless stell,  glasses sample were annealed with the decreases rate 7 o C per minute. Physical properties og glass medium such as density, molar volume and refractive index were inviestigated. From measured results can be known that Er 3+ ion doped with lithium borate glass can affect physical properties of glass host medium. Density of glass is increased from 2.96 gr/cm 3 (x = 0.1 mol%) to 3.185 gr/cm 3 (x = 4 mol%). Refractive index of glass medium also increased with addition Er 3+ ion concentration. The maximum refractive index is obtained when Er 3+ ion concentration of 2.0 mol%. Based on research results can be explained that Er 3+ doped Lithium-Borat glasses can be used as one of optical gain candidate.

Pengaruh Konsentrasi Ion Aktif Erbium (Er3+) Terhadap Sifat Fisis Medium Gelas Borat-Lithium