Analysis of upconversion processes in germanate and tellurite glasses codoped with Yb3+/Ho3+

In this paper the analysis of upconversion luminescence dynamics in tellurite and germanate glasses doped with Ho<sup>3+</sup> and sensitized by Yb<sup>3+</sup> in 8:1 molar ratio was presented. Population of energy levels was calculated using Runge-Kutta method. The influence of pump power (976 nm) radiation on population of excited levels and the possible upconversion mechanisms were analyzed. The energy transfer coefficient in tellurite glass C<sub><sup>D2</sup></sub> = 5,0 x 10<sup>-18</sup> cm<sup><sup>3</sup></sup>/s, C<sub>D3</sub> = 1,5 x 10<sup>-17</sup> cm<sup>3</sup>/s and C<sub><sub>D4</sub></sub> = 9,0 x 10<sup><sup>-17</sup></sup> cm<sup>3</sup>/s and in germanate glass C<sub>D2</sub> = 2,80 x 10<sup>-18</sup> cm<sup>3</sup>/s, C<sub>D3</sub> = 6,35 x 10<sup>-18</sup> cm cm<sup>3</sup>/s and C<sub>D4</sub> = 3,56 x 10<sup>-17</sup> cm<sup>3</sup>/s were used to analyze dynamics of upconversion processes.

[1]  M. E. Torres,et al.  Cooperative energy transfer in Yb3+–Tb3+ codoped silica sol-gel glasses , 2001 .

[2]  Q. Nie,et al.  Energy transfer and frequency upconversion in Ho3+/Yb3+ co-doped bismuth-germanate glasses , 2008 .

[3]  Yasutake Ohishi,et al.  Spectroscopic properties of Tb3+-Yb3+-codoped borosilicate glasses for green lasers and amplifiers , 2006, SPIE Optics East.

[4]  Xiang Shen,et al.  Investigation of energy transfer and frequency upconversion in Ho3+/Yb3+ co-doped tellurite glasses , 2007 .

[5]  Shibin Jiang,et al.  Optical transitions and visible upconversion in Er3+ doped niobic tellurite glass , 2003 .

[6]  Younes Messaddeq,et al.  Frequency upconversion in Er3+/Yb3+-codoped chalcogenide glass , 1998 .

[7]  S. Rai,et al.  UV–visible emission in Tb–Yb codoped tellurite glass on 980-nm excitation , 2007 .

[8]  Robert J. Thrash,et al.  Upconversion laser emission from Yb3 + -sensitized Tm3 + in BaY2F8 , 1994 .

[9]  Wei Chen,et al.  An efficient erbium doped phosphate laser glass for high average power pumping , 2009 .

[10]  C. Wiechers,et al.  Near-IR emission from holmium–ytterbium co-doped alkali bismuth gallate and fluorophosphate fiber glass preforms , 2009 .

[11]  Effect of thermal lens on beam quality and mode matching in LD pumped Er?Yb-codoped phosphate glass microchip laser , 2008 .

[12]  J. Méndez-Ramos,et al.  Up-conversion and colour tuneability in Yb3+–Er3+–Tm3+ co-doped transparent nano-glass-ceramics , 2009 .

[13]  L. Johnson,et al.  Upconversion laser emission from Yb 3+ -sensitized Tm 3+ in BaY 2 F 8 , 1994 .

[14]  Yongming Zhang,et al.  Red and green upconversion luminescence of Gd2O3 : Er3+, Yb3+ nanoparticles , 2008 .