Abstract
An electro-optic modulation system was adopted for measuring the quadratic electro-optic coefficient of KTN crystal. Theoretical analysis and experimental results verified the feasibility of this method. The quadratic electro-optic coefficient of a KTN crystal chip, which has a Curie temperature of 0 °C, was measured using this system in the temperature range of 2 °C to 18 °C (Tc = 0 °C). The influences of temperature, AC voltage and frequency on the quadratic electro-optic coefficient were discussed. It was found that the relaxation effect of PNRs (polar nano-regions) played an important role in the determination of the quadratic electro-optic coefficient of KTN crystal.
Highlights
Potassium tantalum niobate has the largest known quadratic electro-optic coefficient in the paraelectric phase [1], which is about 70 times larger than that of lithium niobate [2]
The quadratic electro-optic coefficient of a KTN crystals is usually calculated by measuring its dielectric constant [8], but the obtained result by this method is the average quadratic electro-optic coefficient of the KTN crystal
An electro-optic modulation system was adopted for measuring the quadratic electro-optic coefficient of KTN crystal
Summary
Potassium tantalum niobate has the largest known quadratic electro-optic coefficient in the paraelectric phase [1], which is about 70 times larger than that of lithium niobate [2]. KTN crystal has obvious advantages when it is used as an electro-optic deflector [3] or modulator [4]. For the reason of composition inhomogeneity, we cannot accurately measure the quadratic electro-optic coefficient at a certain point by its dielectric constant.
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