Abstract
The saturable absorbers play key role in passively Q-switched lasers, and Cr4+-doped crystals present attractive advantages for Yb:YAG lasers. At present the major problem is the low doping concentration of Cr4+ and the effective way to promote Cr3+→Cr4+ conversion. From this view, we introduce divalent additives Ca2+ and Mg2+ as charge compensators to ensure the charge state of Cr4+ in the tervalence environment of Yb:YAG. The results reveal that this method can promote Cr3+→Cr4+ conversion effectively and an optimal CaO/MgO ratio is 1:4. The corresponding Cr0.01at.%,Yb5at.%:YAG single crystals present enhanced absorption coefficients and fluorescence intensity at 941 nm and 1030 nm, and decreased fluorescence lifetimes and decay curves than Yb:YAG. The thermal expansion coefficient and laser damage threshold of Cr,Yb:YAG single crystal are approaching the YAG host material. The results show that Cr,Yb:YAG crystal has good potential for self-Q-switched monolithic solid-state lasers.
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