Powerful visible luminescence in a Gadolinium Gallium Garnet (GGG) crystal, co-activated with Yb3+ (~15 at.%) and Ho3+ (~0.1 at.%) ions, is investigated under CW laser diode pumping (lambda = 938 and 976 nm). The main visible emission band is observed in the green with its peak at lambda ~540 nm) and measured to be about 10% with respect to Yb3+ IR luminescence (lambda ~1000 nm). Red (lambda ~650 nm) and near-IR (lambda ~755 nm) emission bands are also observed but are weaker (about 3-5%). Analysis of the crystal absorption and luminescence spectra allows one to conclude that Yb3+ - Ho3+ stepwise up-conversion is the mechanism explaining the phenomenon. Ho3+ ions embedded in the crystal in small concentration are shown to form an effective reservoir for energy transferred from the excited Yb3+ subsystem and to be an efficient source of the visible emission.
Ybdoped materials. whith typically lase around 1,03 pm, have the simple electronic stNctwe of Yband have attraded cnnsiderable attention over the past few years. Only a several Ybdoped aystals have been extensively studied as laser media to date: %YAG 111, Yb-FAP,YbS-FAP lu and Yb-GSGG 131.In this paper we repotl for the first time about m m temperature single-mode CW operation of Yb-EdSGa~Ot2 ( YCGGG) laser at Ti-sapphire laser pump in the range of 0.944.97 pm.
Yb-doped materials, whith typically lase around 1.03 μm, have the simple electronic structure of Yb3+ and have attracted considerable attention over the past few years. Only a several Yb-doped crystals have been extensively studied as laser media to date: Yb-YAG/1/, Yb-FAP,Yb-S-FAP /2/ and Yb-GSGG /3/.
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