Abstract

The electro-optic coefficients of two crystals have been measured by both static and dynamic methods. For NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub>, <i>r</i><sub>63</sub> =2.54, <i>r</i><sub>41</sub>=6.25; for KH<sub>2</sub>PO<sub>4</sub>, <i>r</i><sub>63</sub>=3.15, <i>r</i><sub>41</sub>,=2.58 (units 10<sup>-7</sup> c.g.s., 20°C λ5560). The variation of the electro-optic response with the frequency of the applied field is given and related to the piezoelectric vibrations of the crystal. A theoretical relation for the difference in the electro-optic constants measured at constant stress and at constant strain is derived, which provides a check on the consistency of the presently available electro-optic, photo-elastic, piezoelectric, and elastic coefficients for these crystals. The use of a.c. methods to obtain high precision in polarization measurements is discussed.

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