Abstract
An analysis of the red to ultraviolet wavelength upconversion in Ho3+ in SrLaGa3O7 and SrLaGaO4 crystals is given. Upconverted, ultraviolet emission from the 3D3 level under cw 647nm excitation at room temperature was observed. Excitation of the 5F5 level, corresponding to the 5I8→5F5 transition, leads to intense emission from the 5I7, 5I6, 5F5, 5S2, 5F3, 3G5 and 3D3 levels. Based on the energy level diagram of Ho3+, the pump intensity dependencies and experimental time dependencies of the observed emissions, an excitation scheme is proposed.
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