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"Laser Cooling of Solids" icon

Laser Cooling of Solids

Enhanced laser cooling of ion doped nanocrystalline powders (e.g., Yb3+: Y2O3) can be achieved by enhancing the anti-Stokes, off-resonance absorption, which is proportional to the three design-controlled factors, namely, dopant concentration, pumping field energy, and anti-Stokes transition rate. The optimum dopant concentration for cooling shows that higher dopant concentration increases absorption, while decreases quantum efficiency. Using the energy transfer theory for concentration quenching, the optimum concentration corresponding to the maximum cooling power is found. The pumping field energy is enhanced in random nanopowders compared with bulk crystals under the same irradiation, due to the multiple scattering of photons. Photons are thus localized in the medium and do not propagate,... Show More


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