Abstract
The temperature dependence of the principal refractive indices of potassium-gadolinium tungstate crystals with 7% Yb impurity and pure potassium-yttrium tungstate without impurities has been measured for seven wavelengths in the visible spectral range at temperatures of 20–400°C. It is shown that the thermooptical coefficients for each crystal have different signs at a fixed wavelength. Based on measurements of the temperature behavior of the principal and additional refractive indices and analysis of their thermooptical coefficients, some athermal directions are found in both crystals.
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Original Russian Text © I.T. Bodnar’, 2009, published in Optika i Spektroskopiya, 2009, Vol. 106, No. 5, pp. 843–847.
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Bodnar’, I.T. Temperature dependence of the principal and additional refractive indices of Yb:KGW and KYW crystals in the range of 20–400°C. Opt. Spectrosc. 106, 762–766 (2009). https://doi.org/10.1134/S0030400X09050245
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DOI: https://doi.org/10.1134/S0030400X09050245