Abstract

The use of Yb3+ co-doping for the enhancement of Ho3+:I56I57 mid-IR (MIR) emissions was investigated in GGG crystal for the first time. It is established that Yb3+ highly increases Ho3+ 2.84 μm emissions by transforming pump energy from the Yb3+:F25/2 level to the laser upper level I56 of Ho3+. The energy-transfer efficiency from Yb3+:F25/2 to Ho3+:I56 is calculated to be 96.2%. The absorption cross section, emission cross section, and fluorescence quantum efficiency are estimated and discussed. It is concluded that the Yb, Ho:GGG crystal is promising material for an LD-pumped 2.84 μm laser application.

© 2013 Optical Society of America

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