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首页> 美国卫生研究院文献>Scientific Reports >Development of ytterbium-doped oxyfluoride glasses for laser cooling applications
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Development of ytterbium-doped oxyfluoride glasses for laser cooling applications

机译：开发用于激光冷却的掺氟氧化玻璃

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摘要

Oxyfluoride glasses doped with 2, 5, 8, 12, 16 and 20 mol% of ytterbium (Yb3+) ions have been prepared by the conventional melt-quenching technique. Their optical, thermal and thermo-mechanical properties were characterized. Luminescence intensity at 1020 nm under laser excitation at 920 nm decreases with increasing Yb3+ concentration, suggesting a decrease in the photoluminescence quantum yield (PLQY). The PLQY of the samples was measured with an integrating sphere using an absolute method. The highest PLQY was found to be 0.99(11) for the 2 mol% Yb3+: glass and decreases with increasing Yb3+ concentration. The mean fluorescence wavelength and background absorption of the samples were also evaluated. Upconversion luminescence under 975 nm laser excitation was observed and attributed to the presence of Tm3+ and Er3+ ions which exist as impurity traces with YbF3 starting powder. Decay curves for the Yb3+: 2F5/2 → 2F7/2 transition exhibit single exponential behavior for all the samples, although lifetime decrease was observed for the excited level of Yb3+ with increasing Yb3+ concentration. Also observed are an increase in the PLQY and a slight decrease in lifetime with increasing the pump power. Finally, the potential of these oxyfluoride glasses with high PLQY and low background absorption for laser cooling applications is discussed.
机译：用常规的熔融淬火技术制备了掺有2、5、8、12、16和20 mol％的（（Yb 3 + ）离子的氟氧化物玻璃。表征了它们的光学，热和热机械性能。 Yb 3 + 浓度的增加，在920 lasernm激光激发下1020 nm处的发光强度降低，表明光致发光量子产率（PLQY）降低。使用绝对方法用积分球测量样品的PLQY。对于2 mol％的Yb 3 + ：玻璃，最高PLQY为0.99（11），并随着Yb 3 + 浓度的增加而降低。还评估了样品的平均荧光波长和背景吸收。观察到在975 nm激光激发下的上转换发光，归因于存在Tm 3 + 和Er 3 + 离子，它们与YbF3起始粉末作为杂质痕迹存在。 Yb 3 + 的衰减曲线： 2 F5 / 2→ 2 F7 / 2跃迁对所有样品均表现出单指数行为，尽管寿命随着Yb 3 + 浓度的增加，Yb 3 + 的激发能级降低。还观察到随着泵浦功率的增加，PLQY会增加，寿命会略有减少。最后，讨论了这些具有高PLQY和低背景吸收的氟氧化物玻璃在激光冷却应用中的潜力。

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