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Erbium (Er)-doped fluoride crystals (YLF, BYF, CaF 2 , etc.) are well-known as active media for solid-state lasers emitting in IR and VIS spectral domains, and as materials for efficient near-IR to VIS upconversion. In this paper, we report on the study of conversion of IR light from an ∼1.5μm spectral region to an ∼1μm spectral domain in low-phonon RE-doped fluoride crystals CaF 2 ...
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