A total internal reflection diffraction device has been constructed using a quadratic electro-optic material (KTN). This device exhibits a best zero order extinction voltage of 40 V, and a capacitance of 630 pf at room temperature (20° C above Curie temperature). Useful modulation is achieved with coarse gratings (0.4 mm pitch at 0.63μm) and mildly striated material can often be use
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