Improvement of Long-Term Stability of Phase Measurement in Electrooptic Field Visualization System for Antenna Measurement in 300-GHz Band

We demonstrate the electrooptic measurement system with long-term phase measurement stability suitable for the high-gain antenna characterization at the 300-GHz band. The long-term phase drift has been canceled out and the standard deviation of the phase measurement has been reduced by a factor of 10, compared to the conventional EO measurement system.