Investigation Optical Properties of PbO-B2O3 (Lead Borate) and Bi2O3 - B2O3 (Bismuth Borate)

In this research, we investigate and compare the optical properties of lead borate and bismuth borate glasses. We used the Refractive index and the energy band gaps determined experimentally in Ref [22]. We found that molar refraction and electronic polarizability demonstrate similar behavior. The metallization varies from 0.630 to 0.568 for lead borate glasses and from 0.526 to 0.435 for bismuth borate glasses with increasing PbO/Bi2O3 content. The transmission coefficient decreased from 0.884 to 0.846 for PbB glasses and from 0.818 to 0.751 for BiB glasses, while the dielectric constant increased from 2.755 to 3.276 for PbB glasses and from 3.094 to 4.884 for BiB glasses. The optical electronegativity decreased from 0.964 to 0.792 for PbB and from 0.857 to 0.760 for BiB. The linear dielectric susceptibility increased from 0.139 to 0.181 for lead borate glasses and from 0.214 to 0.309 for bismuth borate glasses. The nonlinear optical susceptibility changed from 0.647  to 1.829  esu for PbB and from 0.359  to 1.551  esu for BiB , indicating more than fivefold increment. The nonlinear refraction index varied from 1.470  to 3.810  esu for lead borate glasses and from 0.704  to 2.646  esu for bismuth borate glasses. The results confirm that bismuth borate is better than lead borate for optical applications.