Abstract
Anti-Stokes intense green emission was observed after direct excitation of the 5F 5 level of Ho 3+ in LaAlO 3. Up-conversion was observed due to strong Excited State Absorption (ESA), in which two intermediate levels the 5I 7 and the 5I 6, were involved. Power dependence of the antistokes emission depends on excitation wavelengths. The mechanism of the ESA is discussed in details.
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