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ENTROPY AND EFFICIENCY IN LASER COOLING OF SOLIDS

机译:固体激光冷却的熵和效率

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The thermodynamics of laser cooling of solids is analyzed. Using the general theory of radiation entropy, the important roles of the optical frequency and the photon distribution function in determining the radiation entropy are identified. The usefulness of a narrowband approximation is established for a wide range of radiant sources. This approximation is then applied to compare the entropies of different light sources, including blackbody radiation, lasers, fluorescence, and the emerging class of random lasers. Based on these results, the Carnot efficiency for laser cooling of solids is determined, for emission fields with various entropy characteristics. It is shown that fluorescent emission is the most efficient form of the radiated field for laser cooling of solids, and cooling schemes based on any stimulated emission process (including random laser action) are inherently less efficient. The influence of luminescence quantum yield on cooling is also considered.
机译:分析了固体激光冷却的热力学。使用辐射熵的一般理论,确定了光频率和光子分布函数在确定辐射熵中的重要作用。窄带近似的有用性已建立在广泛的辐射源范围内。然后将此近似值用于比较不同光源的熵,包括黑体辐射,激光,荧光和新兴类别的随机激光。基于这些结果,可以确定具有各种熵特性的发射场的固体激光冷却的卡诺效率。结果表明,荧光发射是固体激光冷却中辐射场的最有效形式,基于任何受激发射过程(包括随机激光作用)的冷却方案本质上效率较低。还考虑了发光量子产率对冷却的影响。

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