Thermal Coefficients of the Optical Path Length and Refractive Index in YAG.
The changes in optical path length and refractive index with temperature are measured at 633 nm in undoped YAG in the 85-285 K temperature range. At 100 K the change in optical path length with temperature is only ~25% of its value at 300 K; the change of refractive index with temperature is also substantially reduced at low temperatures.
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