Improvement of 4I11/2 -> 4I13/2 Transition Rate and Thermal Stabilities in Er3+-Doped TeO2

ETRI Journal

关键词: emission cross section;    lifetime;    GeO2;    B2O3;    tellurite glass;    Er;    Optical amplifier;   

Others  :  1184360
DOI  :  10.4218/etrij.01.0101.0401

【 摘 要 】

Spectroscopic and thermal analysis indicates that tellurite glasses doped with B₂O₃ and GeO₂ are promising candidatehost materials for wide-band erbium doped fiber amplifier (EDFA) with a high 980 nm pump efficiency. In this study, we measured the thermal stabilities and the emission cross-sections for Er³⁺: ⁴I_13/2 ? ⁴I_15/2 transition in this tellurite glass system. We also determined the Judd-Ofelt parameters and calculated the radiative transition rates and the multipho-non relaxation rates in this glass system. The 15 mol% sub-stitution of B₂O₃ for TeO₂ in the Er³⁺-doped 75TeO₂-20ZnO-5K₂O glass raised the multiphonon relaxation rate for ⁴I_11/2? ⁴I_13/2 transition from 4960 s^-1 to 24700 s^-1, but shortened the lifetime of the 4I13/2 level by 14 % and reduced the emis-sion cross-section for the ⁴I_13/2 ? ⁴I_15/2 transition by 11%. The 15 mol% GeO2 substitution in the same glass system also reduced the emission cross-section but increased the lifetime by 7%. However, the multiphonon relaxation ratefor ⁴I_11/2? ⁴I_13/2 transition was raised merely by 1000 s^-1.Therefore, a mixed substitution of B2O3 and GeO2 for TeO2was concluded to be suitable for the 980 nm pump effi-ciency and the fluorescence efficiency of ⁴I_13/2 ? ⁴I_15/2 transitionin Er³+-doped tellurite glasses.

   

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