为了研究Yb^(3+):LuLiF_4晶体在反Stokes荧光制冷过程中的热负载管理机制,开展了在常压(1.0×105Pa)和高真空(2.5×10-3 Pa)状态下的激光制冷实验。掺杂浓度为5 mol%的样品由两根光纤支撑,被放置在真空状态不同的腔体内。利用波...为了研究Yb^(3+):LuLiF_4晶体在反Stokes荧光制冷过程中的热负载管理机制,开展了在常压(1.0×105Pa)和高真空(2.5×10-3 Pa)状态下的激光制冷实验。掺杂浓度为5 mol%的样品由两根光纤支撑,被放置在真空状态不同的腔体内。利用波长1 020 nm,功率3 W的激光激发样品。在常压下,样品温度相对室温下降了△T≈12 K;在高真空下,△T≈26 K。对于常压状态,空气热对流负载约11.23 m W,光纤热传导负载约0.03 m W,腔体热辐射负载约4.8 m W。对于高真空状态,空气热对流负载约0.03 m W,光纤热传导负载约0.07 m W,腔体热辐射负载约10.4 m W。实验结果表明,当腔体压强由-105 Pa降至-10-3Pa时,空气热对流负载几乎忽略不计,而腔体热辐射负载则成为作用在制冷样品上最主要的热负载。展开更多
The enhanced laser cooling performance of rare-earth-ions-doped glasses containing small particles is predicted. This is achieved by the enhancement of local field around rare earth ions, owing to the surface plasmon ...The enhanced laser cooling performance of rare-earth-ions-doped glasses containing small particles is predicted. This is achieved by the enhancement of local field around rare earth ions, owing to the surface plasmon resonance of small metallic particles. The role of energy transfer between ions and the particle is theoretical discussed. Depending on the particle size and the ion emission quantum efficiency, the enhancement of the absorption and the fluorescence is predicted. Moreover, taking Yb^3＋-doped ZBLAN as example, the cooling power and heat-light converting efficiency are calculated. It is finally concluded that the absorption and the fluorescence are greatly enhanced in these composite materials, the cooling power is increased compared to the bulk material.展开更多
文摘为了研究Yb^(3+):LuLiF_4晶体在反Stokes荧光制冷过程中的热负载管理机制,开展了在常压(1.0×105Pa)和高真空(2.5×10-3 Pa)状态下的激光制冷实验。掺杂浓度为5 mol%的样品由两根光纤支撑,被放置在真空状态不同的腔体内。利用波长1 020 nm,功率3 W的激光激发样品。在常压下,样品温度相对室温下降了△T≈12 K;在高真空下,△T≈26 K。对于常压状态,空气热对流负载约11.23 m W,光纤热传导负载约0.03 m W,腔体热辐射负载约4.8 m W。对于高真空状态,空气热对流负载约0.03 m W,光纤热传导负载约0.07 m W,腔体热辐射负载约10.4 m W。实验结果表明,当腔体压强由-105 Pa降至-10-3Pa时,空气热对流负载几乎忽略不计,而腔体热辐射负载则成为作用在制冷样品上最主要的热负载。
基金supported by the National Natural Science Foundation of China under Grant Nos.10434060 and 10674047the Doctor Foundation of the Ministry of Education under Grant No.20040269010Shanghai Priority Academic Discipline,and the 211 Foundation of the Ministry of Education Doctor Program Scholarship Fund of ECNU 2007
文摘The enhanced laser cooling performance of rare-earth-ions-doped glasses containing small particles is predicted. This is achieved by the enhancement of local field around rare earth ions, owing to the surface plasmon resonance of small metallic particles. The role of energy transfer between ions and the particle is theoretical discussed. Depending on the particle size and the ion emission quantum efficiency, the enhancement of the absorption and the fluorescence is predicted. Moreover, taking Yb^3＋-doped ZBLAN as example, the cooling power and heat-light converting efficiency are calculated. It is finally concluded that the absorption and the fluorescence are greatly enhanced in these composite materials, the cooling power is increased compared to the bulk material.
