Second-Order Electro-Optic Effect in Diamond

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Abstract
A second-order electro-optic effect has been observed in diamond. An order of magnitude is established for the appropriate second-order electro-optic coefficient of diamond. A linear effect, forbidden by symmetry, is also observed and attributed to random residual strains, an average estimate of which is obtained as 10-5 for the particular sample used in this experiment. Birefringence due to second-order dispersion effects is also discussed.