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Chin. Phys., 2007, Vol. 16(6): 1736-1742    DOI: 10.1088/1009-1963/16/6/043
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effect of lithium-potassium mixed alkali on spectroscopic properties of Er3+-doped aluminophosphate glasses

Liao Mei-Songa, Hu Li-Lia, Fang Yong-Zhengb
a Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Shanghai 201800, China; b Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Shanghai 201800, China;Shanghai Institute of Technology, Shanghai 200023, China
Abstract  Er$^{3+}$-doped lithium-potassium mixed alkali aluminophosphate glasses belonging to the oxide system $x$K$_2$O-(15-$x$)Li$_2$O-4B$_2$O$_3$-11Al$_2$O$_3$-5BaO-65P$_2$O$_5$ are obtained in a semi-continuous melting quenching process. Spectroscopic properties of Er$^{3+}$-doped glass matrix have been analysed by fitting the experimental data with the standard Judd--Ofelt theory. It is observed that Judd--Ofelt intensity parameters ${\it\Omega}_ t (t= 2$, 4 and 6) of Er$^{3+}$ change when the second alkali is introduced into glass matrix. The variation of line strength $S_{\rm ed}$[$^4$I$_{13/2}$,$^4$I$_{15/2}$] follows the same trend as that of the ${\it\Omega}_6$ parameter. The effect of mixed alkali on the spectroscopic properties of the aluminophosphate glasses, such as absorption cross-section, stimulated emission cross-section, spontaneous emission probability, branching ratio and the radiative lifetime, has also been investigated in this paper.
Keywords:  radiative lifetime      Judd--Ofelt theory      non-crystalline materials      mixed alkali  
Received:  20 October 2006      Revised:  29 December 2006      Published:  20 June 2007
PACS:  78.45.+h (Stimulated emission)  
  78.30.Ly (Disordered solids)  
  78.40.Pg (Disordered solids)  
Fund: Project supported by the Young Teacher Foundation of Shanghai Education Committee (Grant No 04YQHB162) and the National Natural Science Foundation of China (Grant No 50572110).

Cite this article: 

Fang Yong-Zheng, Liao Mei-Song, Hu Li-Li Effect of lithium-potassium mixed alkali on spectroscopic properties of Er3+-doped aluminophosphate glasses 2007 Chin. Phys. 16 1736

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