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Violet (402 nm) and blue (470 nm) upconversion-emission with powers of several 10 μW from Er 3+ :ZBLAN fibers under red laser pumping have been obtained. Efficient red-to-violet and red-to-blue upconversion was found using laser diodes at 638 nm, a helium-neon-laser at 633 nm, and a tunable DCM-dye-laser. Pumping at the optimal excitation wavelength at 638 nm, the upconversion emission...
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