The isotopic effect on the magnitude of quadratic electrooptic coefficients in KDP is investigated. By employing both the Miller rule and assumption of a rough constancy of intrinsic electrooptic coefficients, one can expect these quadratic electrooptic coefficients which are related to the electric field applied in the [100] direction, i.e. the coefficients g₁₁₁₁, g₂₂₁₁ and g₃₃₁₁ to be in DKDP almost twice larger than that for KDP. Our measurements of the relative quadratic coefficient n₀³g₁₁₁₁-n_e³g₃₃₁₁ in DKDP are in contradiction with the prediction. We found g₁₁₁₁, g₂₂₁₁ and g₃₃₁₁ to be weakly dependent on the deuteration.

Keywords: electrooptic effects, KH2PO4, KD2PO4

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