Abstract

Composite YAG/Nd:LuAG/YAG transparent ceramics with sandwich structure were fabricated by a non-aqueous tape casting method and vacuum solid-state sintering technology. The cations' (Y3+, Lu3+, Nd3+) diffusion behaviors across the contact interfaces between the pure YAG and Nd3+-doped LuAG layers were determined by Fick's second law. The refractive indices for various wavelengths were determined by fitting with an equation derived from Sellmeier's dispersion equation. Finally, CW laser performances under 808 nm diode-laser pumping were studied with two different ways of pumping, namely the perpendicularly and longitudinally pumping methods. For perpendicular pumping, the variation of CW laser output power with incident pump power was investigated, for which a maximum output power of 1.13 W was observed, whereas in the case of longitudinal pumping, the CW laser output power increased linearly with incident pump power and the opt-to-opt efficiency was estimated to be 0.4%.

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