Abstract
In Cr-doped garnets, with a low crystal field for the octahedral site, Cr3+ can be used as a tunable four-level laser ion as well as an efficient sensitizer ion for Nd3+. Due to the broadband emission of Cr3+, the sensitizer effect is not only restricted to Nd3+; for example, Tm3+ can be pumped via Cr3+ with a quantum efficiency near unity.
© 1986 Optical Society of America
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