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Method for Accurate Gain Calculation of a Highly {\rm Yb}^{3+}/{\rm Er}^{3+} -Codoped Waveguide Amplifier in Migration-Assisted Upconversion Regime

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1 Author(s)
Valles, J.A. ; Dept. of Appl. Phys.-I3A, Univ. de Zaragoza, Zaragoza, Spain

The performance of a highly Yb3+/Er3+-codoped phosphate glass femtosecond-laser written waveguide amplifier is numerically analyzed using a macroscopic rate-equation propagation model where concentration-dependent rates for the interatomic migration-assisted energy-transfer mechanisms are considered. The Er3+-upconversion rate is obtained by a rigorous microscopic statistical modeling of the migration-assisted homogeneous upconversion, and the concentration dependence of the experimental Yb3+-sensitization rate utilized reflects the presence of migration among the Yb3+ ions. The results of the amplifier gain dependence on the dopant concentrations illustrate the influence of migration and the need of a careful modeling of interatomic energy-transfer mechanisms for high-concentration rare-earth-doped fiber or waveguide active devices.

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Quantum Electronics, IEEE Journal of  (Volume:47 ,  Issue: 8 )