Abstract
Time evolution of the 5F 4 5S 2 → 5I 8 fluorescence of Ho 3+-doped zinc tellurite glasses was studied from 37 to 300 K. The time needed to achieve equilibrium between 5F 4 and 5S 2 states is 0.6 μs. Multiphonon relaxation from 5F 4, 5S 2 and 5F 5 levels of Ho 3+ in zinc tellurite was studied. Two types of phonons were found to be effective. It is expected that at low temperature (37 K), laser emission, mainly from the 5S 2 level, will be obtained with a cross section of 2.78 × 10 −20 cm 2. Yet at room temperature laser emission from 5F 4 or 5S 2 can be obtained.
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