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Infrared radiative transitions of thulium doped 5% bismuth oxide modified tellurite glasses

Infrared radiative transitions of thulium doped 5% bismuth o...

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第六届国际稀土开发与应用研讨会

作者： Xin ZHAO,Jie ZHANG,Hai LIN,Changmin LI~* Institute of Inorganic Nonmetal Materials,Dalian Polytechnic university Dalian 116034,PR China

Powerful 1.8μm and effective 1.47μm infrared emissions have been observed in Tm doped 5%BiO modified tellurite glasses(molar composition: 7.5LiO-7.5KO-5BaO -5BiO-75TeO) with lower phonon energies under the excitation of 793 nm diode ***-Ofelt parametersΩ(4.65×10cm),Ω(1.15×10 cm),andΩ(1.16×10 cm) indicate a higher asymmetry and stronger covalent environment in the optical *** predicted spontaneous emission probabilities of F→H and H→F radiative transitions were derived to be 353 and 216 s,respectively, and are larger than those in tungstate fluorophosphate,zinc-boro-silicate,and aluminate *** maximum emission cross-sections of those two transitions are derived to be 6.246×10 and 2.934×10 cm,and the values are obviously higher than those in ZBLAN and tellurite *** low concentration doping,the respective full-widths at half-maximum(FWHMs) of the two emission bands are 136 and 235 nm,the peak intensity ratio of them is close to 0.85,and the quantum efficiency of H state is 74.5%.When the doping concentration increases to 0.5 wt%,the FWHMs of the two emission bands are reduced to 118 and 203 nm,respectively,the peak intensity ratio of the emissions achieves about 2.0,and the quantum efficiency of H level tends to be 62.1%due to the cross-relaxation process[H,H]→[F,F],which benefits to realize efficient 1.8μm *** the population inversion equals 1.0,the ideal gains at 1.675(u-band edge) and 1.854μm were anticipated to be 0.37 and 2.25 dB/cm from the absorption and stimulated emission cross-sections,respectively,and both values are comparable with those in germanate *** result provides a theoretical anticipation for the potentials of Tm doped bismuth oxide modified tellurite glasses in s- and u-band amplifiers and 1.8μm infrared lasers.

关键词： Tm3+ doped bismuth tellurite glasses s- and u-band infrared lasers optical gain anticipation

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