Abstract

We report on the upconversion luminescence of a pure YVO₄ single crystal excited by an infrared femtosecond laser. The luminescent spectra show that the upconversion luminescence comes from the transitions from the lowest excited states ³T₁, ³T₂ to the ground state ¹A₁ of the V${{\mathrm{O}}_4}^{3-}$. The dependence of the fluorescence intensity on the pump power density of laser indicates that the conversion of infrared irradiation to visible emission is dominated by three-photon excitation process. We suggest that the simultaneous absorption of three infrared photons promotes the V${{\mathrm{O}}_4}^{3-}$ to excited states, which quickly cascade down to lowest excited states, and radiatively relax to ground states, resulting in the broad characteristic fluorescence of V${{\mathrm{O}}_4}^{3-}$.

©2005 Optical Society of America

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