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固体材料的激光制冷又称反斯托克斯荧光制冷,是近年来刚兴起的全光学制冷技术。该技术的核心问题是制冷材料的选择。以Tm3+掺杂离子为例,从理论上分析了最小制冷能级间距与激光抽运速率的关系,研究了不同抽运速率下制冷功率与能级间距的关系以及热光转换效率与能级间距的关系,获得了最佳热光转换效率与抽运速率的关系,结果表明,最小的制冷能级间距约为4500 cm-1,能级间距在5000~6000 cm-1的宽度是比较合适的。最后探讨了Tm3+掺杂材料用于激光冷却的可行性,并讨论了制冷基体材料的合理选择问题。
Solid materials, laser cooling, also known as anti-Stokes fluorescent refrigeration, is the all-optical refrigeration technology that has just emerged in recent years. The core issue of this technology is the choice of refrigeration materials. Taking the Tm3 + doping ion as an example, the relationship between the minimum cooling level spacing and the laser pumping rate is theoretically analyzed. The relationship between the cooling power and the energy level spacing at different pumping rates and the relationship between the thermal conversion efficiency and the energy level spacing The results show that the minimum spacing of refrigeration level is about 4500 cm-1, and the width of energy level between 5000 and 6000 cm-1 is more suitable . Finally, the feasibility of using Tm3 + doped materials for laser cooling was discussed. The reasonable selection of refrigeration matrix materials was also discussed.