R<inf>2</inf>O<inf>3</inf> (R = La, Y) modified erbium activated germanate glasses for mid-infrared 2.7 μm laser materials
- Publication Type:
- Journal Article
- Scientific Reports, 2015, 5
- Issue Date:
Er3+ activated germanate glasses modified by La
2O 3 and Y 2O 3 with good thermal stability were prepared. 2.7 μm fluorescence was observed and corresponding radiative properties were investigated. A detailed discussion of J-O parameters has been carried out based on absorption spectra and Judd-Ofelt theory. The peak emission cross sections of La 2O 3 and Y 2O 3 modified germanate glass are (14.3 ± 0.10) × 10-21cm2 and (15.4 ± 0.10) × 10-21cm2, respectively. Non-radiative relaxation rate constants and energy transfer coefficients of 4I 11/2 and 4I 13/2 levels have been obtained and discussed to understand the 2.7 μm fluorescence behavior. Moreover, the energy transfer processes of 4I 11/2 and 4I 13/2 level were quantitatively analyzed according to Dexter's theory and Inokuti-Hirayama model. The theoretical calculations are in good agreement with the observed 2.7 μm fluorescence phenomena. Results demonstrate that the Y 2O 3 modified germanate glass, which possesses more excellent spectroscopic properties than La 2O 3 modified germanate glass, might be an attractive candidate for mid-infrared laser.
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