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固体材料的激光制冷是近年来发展起来的一个新的研究领域.掺Tm3+的ZrF4-BaF2-LaF3-AlF3-NaF-PbF2(ZBLANP)玻璃材料是激光冷却的典型材料之一.与另一种制冷掺杂离子Yb3+相比,Tm3+具有更好的制冷潜力.目前制约材料制冷的一个主要机理就是荧光再吸收.首先根据Tm3+:ZBLANP的光谱参数,利用半经典的随机行走模型得到了不同情况下的平均荧光再吸收次数,随后分析了荧光光子界面出射的全反射效应,并对所得结果进行了修正.计算结果表明,荧光再吸收会导致量子效率降低0.5%—1%,出射荧光波长红移达到2—10nm,激光制冷的效率和功率降低.为了有利于荧光出射和净制冷的实现,宜采用小体积细长棒的制冷元.
Laser cooling of solid materials is a new research field developed in recent years.Zirconium-doped glass (ZrF4-BaF2-LaF3-AlF3-NaF-PbF2) doped with Tm3 + is one of the typical materials for laser cooling, Tm3 + has better refrigeration potential than doped Yb3 + .At present, one of the main mechanisms that restrict the material refrigeration is fluorescence resorption.Firstly, according to the spectral parameters of Tm3 +: ZBLANP, the semiclassical random walk model The average number of fluorescence resorptions was then analyzed, and the total reflection effect of the exit of the fluorescence photon interface was analyzed, and the results were corrected. The results show that the fluorescence resorption can reduce the quantum efficiency by 0.5% -1% 2-10nm, laser cooling efficiency and power reduction.In order to facilitate the fluorescence emission and the net cooling, the cooling element should be small size slender rod.