# Optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses

Vijayakumar, A and Chakradhar, RPS and Ratnakaram, YC (2006) Optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses. In: International Symposium on Non Oxide and new Optical Glasses (ISNOG), 10 - 14 April, 2006, Indian Institute of Science, Bangalore.

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his article presents the optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses of the type $68B_2O_3.xLi_2O.(32-x)Cs_2O$ (where x= 8, 12, 16, 20 and 24 ). The variation of Judd-Ofelt intensity parameters $(\Omega_{\lambda})$, the peak wavelength of the hypersensitive transitions, radiative transition probabilities $(A_{rad})$ and peak emission cross-sections $(\sigma_p)$ with x in the glass matrix has been discussed in detail. The changes in position of hypersensitive transition and intensity parameters with x are correlated to the structural changes in the host matrix. The estimated radiative lifetimes $(\tau_R)$ of certain excited states of both $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses are reported. Branching ratios $(\beta)$ and integrated absorption cross sections $(\Sigma)$ for certain important transitions are presented. Peak stimulated emission cross-sections $(\sigma_p)$ are calculated for the observed emission peaks of $Pr^{3+}$ and $Er^{3+}$ ions in this glass matrix.