## Abstract

We have characterized the effective linear electro-optic coefficients of ${\mathrm{YCa}}_{4}\mathrm{O}{\left({\mathrm{BO}}_{3}\right)}_{3}$ (YCOB) relative to ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$ and ${\mathrm{KD}}_{2}{\mathrm{PO}}_{4}$ at 632.8 nm. We measured a maximum ${r}_{\mathrm{eff}}$ value of $10.8\pm 1.4\mathrm{pm}/\mathrm{V}$ for YCOB in a transverse electric field configuration for propagation along the $X$ or the $\alpha $ dielectric axis, with the electric field applied along the $Z$ or the $\gamma $ dielectric axis. We also found effective coefficients of $10.7\pm 1.0$ and $3.4\pm 0.4\mathrm{pm}/\mathrm{V}$ for YCOB in longitudinal configurations. The remaining values of ${r}_{\mathrm{eff}}$ for various transverse applied voltages were found to be less than 3 pm/V. The excellent thermomechanical properties of this crystal, coupled with moderate electro-optic coefficients, make YCOB and its isomorphs potential candidates for use as high-average-power electro-optic switches.

© 2003 Optical Society of America

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