Highly transparent Cr, Tm, Ho triple-doped Y3Al5O12 (YAG) ceramics were prepared using advanced ceramic technology and their spectroscopic properties were studied for infrared laser applications. 2.09 μm emission was observed by exciting at 430 nm, which indicated the realization of energy transition from Cr3+ to Ho3+ with Tm3+ acted as an intermediate media. The efficiency between the energy transfer (Tm3+) 3F4→ (Ho3+) 5I7 and its back-transfer process was 7.87, which was comparable to that of YAG single crystal and YLF. Studies on the optical gain and stimulated emission characteristics suggested that this triple-doped YAG ceramic could be an appropriate material for 2.09 μm laser application.
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Fei et al. (2013) studied this question.
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