Linear phase shift electrodes for the planar electrooptic prism deflector

Abstract

Three types of compensation electrode are analyzed, which give a more linear phase shift to the propagating optical beam for the planar electrooptic prism deflector. For Types I and III, the more linear phase shift is achieved by varying the slope of the central tilt electrode at the edge regions. For Type II, the more linear phase shift is achieved by cascading an electrode, giving an opposite phase shift to the conventional electrode at the edge regions. Theoretically, Type III is expected to perform best. A physical device was made with Type III electrodes in an array, and it has shown significant improvement in sidelobe suppression and beam size conservation.