Vanier Francis, Côté François, Amraoui Mohammed El, Messaddeq Younès, Peter Yves-Alain, Rochette Martin
Opt Lett. 2015 Nov 15;40(22):5227-30. doi: 10.1364/OL.40.005227.
Thulium-doped (Tm-doped) tellurite glass microspheres are used as laser media. Emission lines at wavelengths near 1975 nm are observed. The onset of laser emission is achieved with 8.6 and 30 μW of coupled pump power and injected pump power, respectively, at a wavelength of 1554 nm. To the authors' knowledge, these are the lowest laser threshold values recorded for a Tm-doped tellurite glass microcavity. Intrinsic Q-factors above 10(6) for the undoped tellurite glass microspheres assert the quality of the fabrication processes. An optical intrinsic Q-factor comparison between Tm-doped tellurite and undoped tellurite microspheres shows that ion absorption is the dominant loss source at pump wavelengths. Lower lasing threshold powers and higher power conversion are observed at longer pump wavelengths in agreement with theoretical models.
掺铥碲酸盐玻璃微球用作激光介质。观察到波长接近1975 nm处的发射线。在1554 nm波长下，分别以8.6 μW和30 μW的耦合泵浦功率和注入泵浦功率实现了激光发射的起始。据作者所知，这些是掺铥碲酸盐玻璃微腔记录到的最低激光阈值。未掺杂碲酸盐玻璃微球的本征品质因数高于10(6)，这表明了制造工艺的质量。掺铥碲酸盐和未掺杂碲酸盐微球之间的光学本征品质因数比较表明，离子吸收是泵浦波长处的主要损耗源。与理论模型一致，在较长泵浦波长下观察到较低的激光阈值功率和较高的功率转换。
