荧光再吸收对固体荧光制冷的影响
Influence of fluorescence reabsorption on solid fluorescence cooling
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摘要: 建立了荧光再吸收的蒙特卡罗计算模型，对不同尺寸的Yb3+:ZBLANP玻璃材料的荧光再吸收作用进行了数值计算，给出了由于再吸收作用引起的荧光平均波长红移与界面反射和材料尺寸的关系。对于立方体形状，当材料尺寸较小时由界面全反射引起的荧光平均波长红移量占主要部分；随着尺寸的变大，界面全反射的影响相对变小；材料尺寸在0.1~1.0 cm时，由于荧光再吸收作用导致的荧光平均波长红移量在2.6~5.0 nm范围内。随激发光波长的变化绝对制冷效率和单位长度的制冷功率均存在极大值,荧光平均波长红移使制冷效率明显下降，通过减小材料尺寸、改变材料形状等措施可减小荧光再吸收作用对激光冷却固体的不利的影响。Abstract: The model of fluorescence reabsorption calculation with Monte-Carlo method is proposed, and the fluorescence reabsorption effects of Yb3+:ZBLANP glass are analyzed for a range of sizes. The redshift in the observed fluorescence spectra caused by the fluorescence reabsorption is calculated considering the reflection on the boundary and material size. For cubic Yb3+:ZBLANP glass, the redshift related to the total internal reflection at the surfaces dominates when the material size is small. The redshift of the mean fluorescence wavelength is in the range of 2.6~5.0 nm when the glass size is in the range of 0.1~1.0 cm. The influence of the fluorescence reabsorption on solid fluorescence cooling can be weakened by minishing material size and changing the geometry of the material.
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