Stepwise two-photon excitation studies in terbium-doped fluoride crystals

Abstract Energy upconversion signals were observed in the wavelength region 360–430 nm when the Tb3+-doped LaF3 and CaF2 crystals were excited with an argon ion laser. Upconversion signal intensity increased 10× when the samples were excited simultaneously with an argon ion laser and a Ti:Sapphire laser.

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