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Infrared to visible upconversion luminescence was demonstrated in trivalent Europium doped Ca_2Al_2SiO_7 crystal (Eu~(3+):Ca_2Al_2SiO_7) irradiated by focused infrared femtosecond laser.The upconversion luminescence originated from ~5D_0 to ~7F_j (j=1,2) transitions of Eu~(3+).The relationship between the upconversion luminescence intensity and the pump power indicated that the upconversion from near-infrared to red is dominated by a two-photon absorption process of Eu~(3+).Analysis suggested that two-photon simultaneous absorption induced population inversion should be the predominant frequency upconversion mechanism.
Infrared to visible upconversion luminescence was demonstrated in trivalent Europium doped Ca_2Al_2SiO_7 crystal (Eu ~ (3 +): Ca_2Al_2SiO_7) irradiated by focused infrared femtosecond laser.The upconversion luminescence originated from ~ 5D_0 to ~ 7F_j (j = 1,2) transitions of Eu ~ (3 +). The relationship between the upconversion luminescence intensity and the pump power indicated that the upconversion from near-infrared to red is dominated by a two-photon absorption process of Eu ~ (3 +). Analysis suggested that two-photon simultaneous absorption induced population inversion should be the predominant frequency upconversion mechanism.