Abstract
This paper demonstrates that annealing can greatly improve the quality of Cr-sensitized Nd:LuAG (Cr,Nd:LuAG) ceramics. Additionally, the pumping efficiency of Nd:LuAG ceramics can be improved by co-doping with Cr3+ ions. The two broad and strong absorption bands around 600 nm (4A2- 4T2) and 440 nm (4A2- 4T1) caused by Cr3+ ions act as effective sensitizers to absorb and convert UV and visible light from a flash lamp. Furthermore, a near-infrared absorption band appears in the in-line transmittance spectra of Cr,Nd:LuAG ceramics. The XPS spectra show that this band is caused by Cr2+ ions. The effect of annealing is studied, and it is found that the near-infrared absorption could be eliminated by annealing in air at 1450 °C for 25 h. Furthermore, the effective fluorescence lifetime of Nd3+ ions in Cr co-doped LuAG ceramics increases from 211.28 μs to 553.80 μs when pumped at 440 nm.
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