Abstract
The up-conversion processes in Ho 3+ doped lithium tantalate were investigated under continuous wave excitation into the 5F 5, 5I 4 or 5I 5 multiplets and with the energy due to the 5I 6→ 5S 2 transition, which is not resonant with the ground state absorption. The most intense green emission originating from the 5S 2 multiplet is observed after excitation into the 5F 5 and 5I 4 multiplets. The excited state absorption spectrum, emission spectra, dependencies of emission intensity on the excitation power as well as possible mechanisms of excitation are presented.
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