Abstract
The ordinary and extraordinary refractive indices of nominally undoped and Yb3+-doped (7 at %) YAl3(BO3)4 crystals have been measured in the visible range at temperatures from 20 to 400°C. The refractive indices are found to increase with temperature. The thermo-optic coefficients are on the order of ∼10−6. The temperature dependences of the refractive indices show a number of anomalies, suggestive of an incommensurate system exhibiting devil’s staircase behavior.
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