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Optical absorption of $Nd^3^+$, $Sm^3^+$ and $Dy^3^+$ in bismuth borate glasses with large radiative transition probabilities

Saisudha, MB and Ramakrishna, J (2002) Optical absorption of $Nd^3^+$, $Sm^3^+$ and $Dy^3^+$ in bismuth borate glasses with large radiative transition probabilities. In: Optical Materials, 18 (4). pp. 403-417.

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Abstract

This paper reports on the optical properties of $Nd^3^+$, $Sm^3^+$ and $Dy^3^+$ in bismuth borate glasses, with $Bi_2O_3$ content varying from 30 to 60 mol%. The variation of the optical properties with composition plays a dominant role in determining a good laser host material. The variation of the Judd–Ofelt intensity parameters ${\Omega}_t (t=2,4,6)$ and the radiative transition probabilities and the hypersensitive band positions, with composition, have been discussed in detail. The changes in position and intensity parameters of the transitions in the optical absorption spectra are correlated to the structural changes in the host glass matrix. The variation of ${\Omega}_2$ with $Bi_2O_3$ content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth–oxygen (R–O) covalency, whereas the variation of ${\Omega}_6$strongly depends on nephlauxetic effect. The shift of the hypersensitive band shows that the covalency of the R–O bond increases with increase of $Bi_2O_3$ content, due to increased interaction between the rare earth ions and the non-bridging oxygens. The radiative transition probabilities of the rare earth ions are large in bismuth borate glasses, suggesting their suitability for laser applications.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Optical absorption studies;Rare earth ions;Glasses
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 02 Jun 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ernet.in/id/eprint/7401

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