Abstract
The up-converted fluorescence of Pr3+ in the Pr3+:GMO crystal is observed at 490 nm and 499 nm(3P0->3H4) when 1D2 level is excited by 595 nm dye laser beam. Both up-converted and ordinary fluorescence show the same lifetime of 200 ns. It is suggested that the sequential two-photon excitation process (STEP) is dominant in the up-conversion mechanism.
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