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We report a varifocal lens made of potassium tantalate niobate (KTa1−xNbxO3, KTN) that exhibits a huge second-order EO effect, namely the Kerr effect. The lens consists of a KTN block on which four strip film electrodes are mounted. A voltage applied with these electrodes forms an electric field distribution, modulates the refractive index of the KTN block, and bends light rays. The lens power can...
A scanning frequency of 350 kHz is demonstrated with a full deflection angle of 95.8 mrad using a KTa1−xNbxO3 (KTN) deflector. To suppress degradation of the deflection angle, the KTN chip is directly glued to metal block electrodes with conductive paste, and the temperature of the deflector is controlled so that the capacitance of the KTN chip remains constant.
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