Abstract
A rate equation approach is used to model an experimentally realized $\sim {2}~\mu{\rm m}~{\rm Tm}^{3+}$-doped tellurite fiber laser utilizing an in-band pumping scheme $({}^{3}H_{6}\ura{}{} ^{3}F_{4})$. Excellent agreement between the theoretically predicted and experimentally
measured slope efficiency is obtained. It is shown that in order to achieve
agreement between the predicted and measured thresholds it is important to
include cross-relaxation mechanisms with the ${}^{3}H_{4}$ level, even with the in-band
pumping scheme. By fitting the results of the model with level lifetime measurements
and the threshold pump powers we have extracted the cross-relaxation parameters
of Tm-doped tellurite glass.
© 2009 IEEE
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