Tang Zhou, Jin-feng Zhang, Bo-qing Hu, and Hua-guang Yang, "Measurements of the thermo-optic coefficient of a barium fluoride single crystal," Appl. Opt. 33, 2620-2623 (1994)
The thermo-optic coefficient dn/dT of single-crystal barium fluoride is measured with a precision spectrometer. The values over the visible region in the 30–90 °C and 90–150 °C ranges are −18.8 and −19.7 × 10−6/°C, respectively.
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The model represents the refractive indices in the wavelength range of 0.4047–0.6563 μm.
The quantity σ = ±{3 Σ υj2/[k (k − 3)]}1/2 defines the standard deviation of regression, where k refers to the number of the data points, υj is the residual between the observed and computed refractive index for j = 1, …, k.
The quantity Δ = ±3(Σ υj2/k)1/2 estimates the accuracy of the fit.
The model represents the refractive indices in the wavelength range of 0.4047–0.6563 μm.
The quantity σ = ±{3 Σ υj2/[k (k − 3)]}1/2 defines the standard deviation of regression, where k refers to the number of the data points, υj is the residual between the observed and computed refractive index for j = 1, …, k.
The quantity Δ = ±3(Σ υj2/k)1/2 estimates the accuracy of the fit.