Abstract

KTa<sub>1-x</sub>Nb<sub>x</sub>O<sub>3</sub> crystal exhibits an extremely large quadratic electro-optic effect, which is 20 times greater than that of LiNbO<sub>3</sub>. This property makes this crystal attractive for optical signal processing applications. We have successfully prepared a 2-inch KTN crystal that exhibits the largest quadratic electro-optic coefficient ever reported. We have also fabricated a buried optical waveguide with a low transmission loss and demonstrated an optical switch with a driving voltage of 2.6 V and a 92 nsec rise time. This paper reviews the crystal growth, material properties, electro-optic effect, waveguide fabrication, and optical switch operation of KTN crystal.

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