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Germanium-niobate glasses doped with Tm3+ and their infrared spectral properties

Wang Yong-Chao Xia Hai-Ping Zhang Jian-Li Zhang Qin-Yuan

Germanium-niobate glasses doped with Tm3+ and their infrared spectral properties

Wang Yong-Chao, Xia Hai-Ping, Zhang Jian-Li, Zhang Qin-Yuan
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  • Received Date:  06 December 2009
  • Accepted Date:  25 December 2009
  • Published Online:  05 April 2010

Germanium-niobate glasses doped with Tm3+ and their infrared spectral properties

  • 1. (1)Key Laboratory of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials,South China University of Technology,Guangzhou 510641,China; (2)Laboratory of Photo-electronic Materials,Ningbo University,Ningbo 315211,China

Abstract: Glasses with the compositions of (90-x)GeO2-xNb2O5-10Na2O(x=1,2,4,6,8 molar ratio)doped with Tm2O3 at the same concentration (4wt%) and 86GeO2-4Nb2O5-10Na2O dore at different concentrations were fabricated respectively by conventional melting method.The effects of Nb2O5 content on glass stability,fluorescence strength and J-O strength parameters were studied.According to the Judd-Ofelt theory,the J-O strength parameters (Ω2, Ω4, Ω6) of Tm3+ in different Nb2O5 concentration were calculated,with which the radiative transition probabilities,branching ratios and radiative lifetime were obtained.Meanwhile,according to the McCumber theory,the absorption and emission cross-sections corresponding to the 3F4→3H6 transitions of Tm3+ at 1.8 μm were obtained.The gain cross section was calculated by using the emission cross-section,absorbtion cross section and Tm3+ concentration.The fluorescence features (under 808 nm LD excitation) at ~1.47 and ~1.8 μm of Tm3+-doped glasses of different concentrations were studied.The fluorescence intensity at ~1.8 μm reached to the maximum when the Tm2O3-doping concentration was about 3wt%,and then decreased as the doping concentration increased further.The fluorescence intensity at ~1.8 μm reached to the maximum when the Nb2O5 content in glass composition was about 2 mol%.The effects of Nb2O5 content on the glass structure and the spectra properties were also discussed.

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