Open AccessStudy on a New Measurement Method of Small Polarization Rotation Using the Common-Path Heterodyne Interferometry and a Half-Wave Plate
Author(s) -
Ming-Hung Chiu,
Chih-Ting Tsai
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/711/1/012082
Subject(s) - optics , interferometry , waveplate , polarization (electrochemistry) , azimuth , physics , rotation (mathematics) , optical path length , heterodyne detection , optical rotation , polarization rotator , heterodyne (poetry) , optical path , birefringence , acoustics , chemistry , mathematics , laser , geometry
This thesis proposes a novel method for small polarization rotation measurement using a half-wave plate and a high-stability common-path heterodyne interferometry. The phase with azimuth angle 22.5° of a half-wave plate has a distinct change resulting from the small polarization rotation of the incident light. The optical rotation properties of a material, such as glucose solution, can be determined in this phase from the concentration of the solution. Finally, the phase can be measured using a lock-in amplifier, and the relevant formula between the glucose concentration and the polarization rotation can also be identified with a recording table.