Changes in the electroholographic properties of a paraelectric potassium lithium tantalate niobate crystal by electrostriction

We theoretically studied the diffraction properties of an electroholographic (EH) optical switch made from a K0.95Li0.05Ta0.61Nb0.39O3 crystal, assessing the influence of the Kerr effect and electrostriction effect (ES). Specifically, we studied how the diffraction properties changed with temperature, writing-beam angle and polarization angle, when the ES effect is ignoring or accounting for it. We then analyzed the origin of the influence of ES on the diffraction properties. Our results revealed that ES increased the maximum diffraction efficiency and the specific field. We concluded that ES influenced the diffraction properties by decreasing the Bragg mismatch angle and increasing the effective Kerr coefficient.