A phase quadrature interferometer for measuring the small optical rotation angle of a chiral medium

作者：Lee Ju Yi^*; Cai Sing Sian

来源：Optics Communications, 2008, 281(10): 2735-2739.

DOI：10.1016/j.optcom.2008.01.035

• phase quadrature interferometry
• optical rotation angle
• chiral medium

The passage of a linearly polarized beam through a chiral material and a phase retarder will induce a phase difference between the s and p polarizations of the beam. In this study, a phase quadrature interferometer is designed to measure the phase difference variation proportional to the optical rotation. The proportionality constant (or measurement sensitivity) can be greatly enhanced by setting the retardation of the phase retarder close to 0 degrees or 180 degrees. The experimental results demonstrate that with our system we can obtain a measurement resolution for the rotational angle of better than 3.5 degrees x 10(-4). This method has several advantages such as a simple optical setup, easier operation in real time, and low cost. In addition, due to the common-path arrangement, surrounding noise can be eliminated.

• 出版日期2008-5-15
• 单位中央民族大学