Luminescence characteristics of ultraviolet upconversion from Er 3 + :YAG crystal by Ar + laser (488 nm) excitation
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Ultraviolet and violet upconversion signals at 271 nm, 317 nm, 381 nm and 407 nm were observed when an erbium-doped YAG crystal was pumped by an Ar+ laser (488 nm). The dependence of intensity of luminescence emitting from the 4S 3/2 state and the 2P 3/2 state on pump power (I) was experimentally investigated. Changes from I1 down to I 1/2 for the 4S 3/2 state and from I2 down to I1 for the 2P 3/2 state were observed. The upconversion mechanism was discussed by means of the rate equations. It appears that energy-transfer upconversion (ETU) is a dominant process for the Er3+:YAG crystal used in our experiment.
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