Electrooptic coefficient measurements in LiTaO/sub 3/ and LiNbO/sub 3/ waveguides

The magnitudes of linear electrooptic coefficients r/sub 13/ and r/sub 33/ in Zn:LiTaO/sub 3/ repoled channel waveguides are reported. The measurements were made at 0.633- mu m wavelength using a Fabry-Perot interferometer. The waveguides were produced by diffusion from the vapor phase at a temperature above the Curie temperature. For full recovery of the Pockels effect, an electric field of 200 V/cm is needed during repoling. The measured values of r/sub 13/ and r/sub 33/ at 32-MHz modulation frequency are 7.2 and 30.3 pm/V, respectively. The difference between unclamped and clamped coefficients is comparable to that from bulk crystals. Measurements were also made on Ti:LiNbO/sub 3/ waveguides that did not require repoling, and good agreement with bulk crystal values was obtained.<
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