材料科学
激光阈值
激光器
低语长廊波浪
聚苯乙烯
光电子学
光热治疗
辐射
兴奋剂
光学
纳米技术
波长
谐振器
复合材料
聚合物
物理
作者
Rachel Gariepy,Xiaojing Xia,Robert G. Felsted,Ayelet Teitelboim,Emory M. Chan,Peter J. Pauzauskie
摘要
Microlaser designs based on the coupling of whispering gallery modes (WGMs) with the upconversion processes which take place within lanthanide-doped nanoparticles (UCNPs) have been demonstrated and shown to have many valuable qualities, such as high Q factors and low lasing thresholds. One obstacle that these microlaser designs still face is the challenges caused by photothermal heating of the gain medium, which could be solved through the design of a radiation balanced microlaser. In this work, WGM microresonators composed of 5 μm diameter polystyrene spheres are fabricated with a layer of Yb3+-doped NaYF4 UCNPs in order to test if the anti-Stokes cooling properties of the UCNPs can cool the microresonator and its environment under laser irradiation. We find via calibrated mean fluorescence spectroscopy that the UCNPs can cool their local environment by as much as 23 °C and significantly reduce the heating of the aqueous environment surrounding the microresonator, showing promise for inclusion in a design for a radiation balanced microlaser.
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