We present an overview of solid‐state optical refrigeration also known as laser cooling in solids by fluorescence upconversion. The idea of cooling a solid‐state optical material by simply shining a laser beam onto it may sound counter intuitive but is rapidly becoming a promising technology for future cryocoolers. We chart the evolution of this science in rare‐earth doped solids and semiconductors.
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Sheik‐Bahae et al. (2008) studied this question.
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