The EOM characteristics were noted in cross polarizer configuration. I rotate the input polarization, by rotating the input polarizer. The output polarizer was also rotated by the same amount in the same direction. At last, I obtain a sinusoidal response of transmission for different rotation of input polarization. In order to maximize the transmission, i.e optimize the input polarization to be 45 degree relative to the crystal axis, I move the polarizer to the maximum transnmission position. The polarizer was at the end rotated by -12deg.