Electrooptic effect in trigonal selenium at 1.15 microns

The clamped electrooptic coefficient r
11
was measured at 1.15 microns for a selenium crystal grown from an aqueous sulfide solution. The value obtained for
n_{1}^{3}r_{11}
is
8.9 \times 10^{-11}
m/V and, depending on the value used for n
1
, the value for r
11
ranges between 5.7 and
3.2 \times 10^{-12}
m/V. These data indicate modulating efficiencies that may be more than double those calculated from earlier infrared measurements on selenium.