Simultaneous three-photon absorption induced ultraviolet upconversion in Pr~(3+):Y_(2)SiO_(5) crystal by femtosecond laser irradiation

摘要

Near-infrared to ultraviolet upconversion luminescence was observed in the Pr~(3+):Y_(2)SiO_(5) crystal with 120 fs, 800 nm infrared laser irradiation. The observed emissions at around 270 nm and 305 nm could be assigned to 5d -> 4f transitions of Pr~(3+) ions. The relationship between the upconversion luminescence intensity and the pump power of the femtosecond laser reveals that the UV emission belongs to simultaneous three-photon absorption induced upconversion luminescence.