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The most efficient lamp-pumped laser yet reported has been obtained from the 2.1-μm transition of Ho3+in Er3+-Tm3+sensitized YAG at liquid nitrogen temperatures. Multimode CW output of 20 W, efficiencies up to 4 percent, and 5-W TEM00at 1 percent resulted when tungsten-iodine pump lamps were utilized.
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Devor et al. (1972) studied this question.
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