Abstract
In this work, refractive indices of K(H1−xDx)2PO4 crystals, in which the range of x was from 0 to 1, were measured in the visible region by V-prism method. The measured data revealed that both refractive index and birefringence decreased with the increasing of the deuterium content in K(H1−xDx)2PO4 crystals. Furthermore, there is a good linear dependence of refractive index on deuteration level. In terms of numerical fits to Sellmeier formula were made, permitting the interpolation consistent with the experimental data. Refractive indices of deuterated KDP crystal with arbitrary deuterium content at varying wavelength are provided to predict phase-matching behavior of frequency doubling according to our data and formulas. Meanwhile, our results provide a potential method to quantify the deuterium content of K(H1−xDx)2PO4 crystals by measuring the refractive index.
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