Abstract

The linear electro-optic coefficients of KH<sub>2</sub>PO<sub>4</sub> and a number of its isomorphs have been measured at room temperature using dc voltages. The results at 546 nm are as follows: <i>r</i><sub>63</sub>=10.3±0.1×10<sup>-12</sup>m/V for KH<sub>2</sub>PO<sub>4</sub>, 10.9±0.1×10<sup>-12</sup> m/V for KH<sub>2</sub>AsO<sub>4</sub>, and 13.0±0.2×10<sup>-12</sup> m/V for RbH<sub>2</sub>AsO<sub>4</sub>; <i>r</i><sub>41</sub>=8.77±0.14×10<sup>-12</sup> m/V for KH<sub>2</sub>PO<sub>4</sub>, 24.5±0.4×10<sup>-12</sup> m/V for NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub>, 12.5±0.4×10<sup>-12</sup> m/V for KH<sub>2</sub>AsO<sub>4</sub>, and 8.8±0.4×10<sup>-12</sup> m/V for KD<sub>2</sub>PO<sub>4</sub> which was about 90% deuterated. A transverse modulator based on a single 45° Y-cut crystal of NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> is proposed which requires only 45 V rms for 50% amplitude modulation of 632.8 nm light.

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