Abstract
Thulium doped fluoroindogallate glass was characterized by means of excited state absorption experiment in the 0.95 to 1.55 μm spectral range. The three bands corresponding to the electronic transitions 3F4→3F2 (at 1.05 μm), 3F4→3F3 (at 1.125 μm), and 3F4→3H4 (at 1.45 μm) were observed. The energy transfer microscopic parameters for the reverse cross relaxation process 3F4, 3F4→3H6, 3H4 were calculated for different multipolar interaction mechanisms using the Kushida model, and it was verified that the probability of this process is 100 times lower than that of the direct 3H4, 3H6→3F4, 3F4 cross relaxation, responsible for the 1.8 μm emission pumping.
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