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Optical refrigeration has been observed by subjecting single crystals of yttrium aluminum garnet and Nd-doped yttrium aluminum garnet to intense 1.064-{μ} laser radiation. In addition to this first observation of optical refrigeration, the present experiments yield a very accurate value for the fluorescent quantum efficiency of Nd-doped yttrium aluminum garnet.
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Kushida et al. (1968) studied this question.
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