We present a theoretical scheme for laser cooling in Tm3+-doped oxy-fluoride glass ceramic (GC). Tm3+-doped GC has a unique combination of high chemical and mechanical stability related to the oxide glass and low phonon energy of the fluoride nanocrystals, which trap a majority of Tm3+ ions. This unique property of GC makes it attractive for a number of applications. The effective embedding of rare-earth ions in the crystalline phase with low phonon energy provides high quantum efficiency for the F43→H63 transition in the Tm3+ ions participating in the cooling cycle.
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Nemova et al. (2012) studied this question.
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