A synchronous polarimeter was set up for the measurement of small rotation angles of the polarization plane of light. The polarimeter is based on a polarizer–Faraday modulator–analyzer structure with a synchronous detection scheme, which produces a linear system response. The theoretical background is studied, and the system performance is investigated experimentally. We achieved an accuracy of the order of 10<sup>−4</sup> deg, or 5 mg/dl of glucose in a 1-cm light path.
© 2000 Optical Society of America
Alfredo Arnaud, Fernando Silveira, Erna M. Frins, Alfredo Dubra, César D. Perciante, and José A. Ferrari, "Precision synchronous polarimeter with linear response for the measurement of small rotation angles," Appl. Opt. 39, 2601-2604 (2000)