Abstract

YLF: Er³⁺ crystals are well-known laser materials generating on a number of wavelengths in the blue, green and near IR spectral ranges under selective laser pumping. Possibility for inversion population of working laser levels strongly depends on the rates of up-conversion processes, which in its turn depend on concentration of dopant ions. We considered concentration and power dependences of population of Er³⁺ levels in LiY_1-xEr_xF₄ (x=0.003-1) crystals under upconversion excitation by laser diodes.

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