Abstract
The clamped electrooptic coefficient r <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> was measured at 1.15 microns for a selenium crystal grown from an aqueous sulfide solution. The value obtained for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n_{1}^{3}r_{11}</tex> is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">8.9 \times 10^{-11}</tex> m/V and, depending on the value used for n <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> , the value for r <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> ranges between 5.7 and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3.2 \times 10^{-12}</tex> m/V. These data indicate modulating efficiencies that may be more than double those calculated from earlier infrared measurements on selenium.
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