影响固体材料激光冷却若干因素的研究  

Research on several parameters influencing on laser cooling of solids

作　　者：贾佑华[1] 纪宪明[1] 印建平[1] 

机构地区：[1]光谱学与波谱学教育部重点实验室华东师范大学物理系,上海200062

出　　处：《物理学报》2007年第3期1770-1774,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10174050和10374029);上海市重点学科和教育部211工程专项基金资助的课题.~~

摘　　要：采用一个简单的二能级系统来分析激光冷却的微观物理过程,从微观的离子数等方面讨论制冷功率,从而计算出温度的变化,同时讨论了影响制冷功率的因素,找到了提高制冷功率的途径,详细分析了掺杂离子浓度、抽运功率、有效吸收截面对冷却极限的影响.最后比较了计算结果与实验数据,二者基本一致,从而验证了采用该二能级系统理论分析反斯托克斯荧光制冷的合理性.Laser cooling of solids is also called anti-Stokes fluorescent cooling, it is a new optical cooling technology in recent years. We propose a two-level model to analyze the absorption and stimulated,emission processes between the Yb^3 ＋ 2 F7/2 ground-state manifold and the 2^F5/2 excited,state manifold, and discuss several parameters that influence the cooling power, and find some ways to improve the cooling power. The influences of the doped concentration, pumping power and the effective pump-spot area on cooling are particularly analyzed. At the same time, we make computer simulation about the cooling process and obtain the temperature as a function of the cooling time, which is similar to the experimental results. So this shows that our model is reasonable.

关 键 词：激光制冷 反斯托克斯荧光 掺杂浓度 制冷功率 

分 类 号：O431.2[机械工程—光学工程]