Measurement of large electro-optic coefficients in thin films of strontium barium niobate (Sr0.6Ba0.4Nb2O6)

.A reflection-grating measurement technique is reported for measurement of the electro-optic coefficient in crystalline strontium barium niobate thin films grown using pulsed laser deposition. The measurement yields a value of about 350 pm/V for the r(33) coefficient of the Sr0.6Ba0.4Nb2O6(SBN:60) film. The measurement technique is based on a modulated diffraction pattern measurement using coplanar electrodes and can be extended to a range of cases where it is not possible to deposit electrodes on both sides of a film. (C) 1996 American Institute of Physics.