Large optical rotation angles measurement using frequency spectrum analysis

Abstract

An improved method was proposed for the measurement of large rotation angles of the polarization plane of light. We analyze the frequency spectrum of the output signal in rotation measurement system and adopt a new algorithm which is applied to measure large angles. The theoretical background is studied, and the system performance is experimentally. The experimental results show that the measurement accuracy is less than 0.05deg and the standard deviation of multiple measurements is less than 0.0008.