Some Physical Properties of Single Crystals of Normal and Deuterated Potassium Dihydrogen Arsenate. II. Electro-optic and Dielectric Properties

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Abstract
The electro‐optic and dielectric constants of single crystals of potassium dihydrogen arsenate, grown in H2O, and potassium dideuterium arsenate, grown in D2O, have been measured. On deuteration, the relative dielectric constant K33 is increased from 24 to 31 and K11 is increased from 60 to 70, measured at 25°C. The half‐wave retardation voltage Vλ/2, measured at 500 nm is decreased from 5.9 to 3.3 kV, and the electro‐optic constant γ63 in increased from 11.0×10−10 cm/V to 19.5 cm/V on deuteration. The loss tangent tanδ33 measured at 1 kHz and at 25°C is about 0.30 for KDA and 0.18 for D‐KDA. The specific resistivity ρ33 for KDA is 7.2×108Ω·cm, and that for D‐KDA is 5.1×108Ω·cm, measured at 25°C. The input power requirement using these crystals in an electro‐optic modulator is compared to that of KDP.

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