Abstract
Four Er-doped LiYF4 crystals with different Er-concentrations were grown by Czochralski method. The laser crystals were characterized by measurements of ICP-AES, XRD, absorption spectra, up-conversion fluorescence spectra, near-infrared (NIR) and mid-infrared (Mid-IR) fluorescence spectra, as well as luminescence decays. It was found that the heavily 15at% Er-doped YLF crystal is more proper in up-conversion or ∼3μm laser applications; while the 5at% Er-doped YLF is a better candidate for ∼1.5μm lasers within these four crystals.
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