Up-conversion (UC) of near-infrared radiation to visible light has received much attention because of its use in conversion of solar radiation, luminescence thermometry, biosensing, and anti-counterfeiting applications. However, the main...

We present the excitation power and doping concentration dependent upconversion properties of SrF2:Yb3+,Er3+ single crystals. The determined optical properties of this bulk material can serve as benchmark values for cubic-phase nanomaterials.

CaF(2)-SrF(2)-YbF(3) fluoride ceramics of high optical quality was prepared, and its absorption, fluorescence, and laser oscillation properties were investigated. Oscillation slope efficiency that was only a few percent lower than that for a single crystal of similar composition was demonstrated under diode pumping.

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SrF(2):Nd(3+) fluoride ceramics of high optical quality was prepared and its spectroscopic and laser properties investigated. Oscillations of different optical centers depending on the excitation wavelength were obtained with a slope efficiency of up to 19%.