Abstract

We present a simple method to measure the contribution from acoustic phonons to the linear electro-optic effect. A step voltage with a short rise time (600 ps) is applied to the sample, and the electro-optic response is measured in the time domain. For the organic salt 4-<i>N</i>, <i>N</i>-dimethylamino-<i>4</i><sup>?</sup>-<i>N</i><sup>?</sup>-methyl-stilbazolium tosylate (DAST), we obtained a negative contribution of <i>r</i><sup>a</sup><sub>111</sub> = -1.0 ± 0.1 pm/V to the overall electro-optic coefficient of <i>r</i><sub>111</sub> = 48 ± 5 pm/V (? = 1535 nm). The electro-optic response was limited only by the rise time of the applied voltage, which corresponds to a frequency of 1 GHz.

© 1997 Optical Society of America

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