Abstract
A simple model is developed to study the laser cooling of solids. The
condition of laser cooling of a solid is developed. By using some parameters of the
Yb<sup>3+</sup> ion, which is most widely used in laser cooling, we then calculate the cooling
power and the cooling efficiency. In order to make a more precise analysis, the
effect of fluorescent reabsorption, which is unavoidable in the cooling process, is
discussed using the random walk model. Taking Tm<sup>3+</sup> ion as an example, we derive the
average number of absorption events and determine the change in quantum efficiency
due to reabsorption. Finally, we obtain the red-shift of the fluorescent wavelength
and the requirement of sample dimension.
© 2012 Chinese Optics Letters
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