Abstract
The first observation of a special up-conversion fluorescence from the 4G 5/2 level of Sm 3+ ions induced by 1.06 μm pulsed laser excitation is reported. Based on the one-photon and two-photon absorption theory, the transition probability and rate are estimated, the fluorescence process is modeled with rate equations. The dominating population of the 4G 5/2 state is attributed to a single photon excitation from ground state 6H 5/2 followed by two-photon absorption from excited state 6F 1/2. Due to their much smaller transition probabilities, the other possible up-conversion luminescence processes are unobserved.
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