Abstract
A new type of bismuth silicate glass
(Bi<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-ZnO-Al<sub>2</sub>O<sub>3</sub>-La<sub>2</sub>O<sub>3</sub>)
doped with Tm<sub>2</sub>O<sub>3</sub> is prepared by melt-quenching method. The
thermal stability of the glass is examined by differential scanning calorimetry. No
crystallization peak is found. Using the absorption and emission spectra, the
absorption and emission cross-sections are calculated. Their maximum data are
2.9×10<sup>-21</sup> cm<sup>2</sup> at 1 663 nm and 4.7×10<sup>-21</sup>
cm<sup>2</sup> at 1 826 nm, respectively. Using the Judd-Ofelt theory, the
radiation transition probabilities and radiative lifetimes are obtained. The
extended overlap integral method is applied to analyze energy transfer process among
the Tm<sup>3+</sup> ions. The transfer constants of cross-relaxation and energy
migration among the Tm<sup>3+</sup> ions at the <sup>3</sup>H<sub>4</sub> level are
7.60×10<sup>-40</sup> and 14.98×10<sup>-40</sup> cm<sup>6</sup>/s, respectively.
The critical transfer radius for cross-relaxation is 0.99 nm. The cross relaxation
process is easy to realize and is favorable for obtaining ~2-μm laser.
© 2012 Chinese Optics Letters
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