Yellow laser potential of cubic Ca-3(Nb,Ga)(5)O-12:Dy3+ and Ca-3(Li,Nb,Ga)(5)O-12:Dy3+ single crystals

Yellow laser potential of cubic Ca-3(Nb,Ga)(5)O-12:Dy3+ and Ca-3(Li,Nb,Ga)(5)O-12:Dy3+ single crystals

Publication Type:

Journal Article

Source:

Journal of Alloys and Compounds, Volume 739, p.806-816 (2018)

ISBN:

0925-8388

Abstract:

<p>Spectroscopic investigation of Dy3+ doped Ca-3(Nb,Ga)(5)O-12 (CNGG) and Ca-3(Li,Nb,Ga)(5)O-12 (CLNGG) single crystals were performed in order to assess their potential as laser materials for yellow emission. Dy: CNGG and Dy: CLNGG single crystals were grown by the Czochralski method and investigated by high-resolution spectroscopic measurements for the first time. The Judd-Ofelt intensity parameters for the f-f transitions of Dy3+ in CNGG and CLNGG single crystals, were used to determine radiative transition rates A(r), branching ratios beta, and radiative lifetime tau(r) of the fluorescent Dy3+ levels. Based on low temperature absorption and emission spectra, partial energy levels diagram of Dy3+ doped CNGG and CLNGG single crystals were obtained. The emission cross-sections for the F-4(9/2) -&gt; H-6(13/2) transition of special interest for laser application were determined. The room temperature decay curves were analyzed through the framework of Inokuti-Hirayama (I-H) model and the results shows that electric dipole-dipole interaction are responsible for the energy transfer processes between Dy3+ ions in CNGG and CLNGG single crystals. (c) 2017 Elsevier B.V. All rights reserved.</p>