Lin Jiun-You, Chen Kun-Huang, Chen Jing-Heng
Department of Mechatronics Engineering, National Changhua University of Education, 2 Shi-Da Road, Changhua City 50074, Taiwan.
Appl Opt. 2007 Nov 20;46(33):8134-9. doi: 10.1364/ao.46.008134.
Based on the phenomena of Brewster's angle and the principles of common-path heterodyne interferometry, we present an optical method for measuring the optical rotation angle and the refractive index of a chiral solution simultaneously in one optical configuration. A heterodyne light beam and a circularly polarized heterodyne light beam are separately guided to project onto the interface of a semicircle glass and a chiral solution. One of the beams is transmitted through the solution, and the other is reflected near Brewster's angle at the interface. Then the two beams pass through polarization components respectively for interference. The phase differences of the two interference signals used to determine the rotation angle and the refractive index become very high with the proper azimuth angles of some polarization components, hence achieving an accurate rotational angle and a refractive index. The feasibility of the measuring method was demonstrated by our experimental results. This method should bear the merits of high accuracy, short sample medium length, and simpler operational endeavor.
基于布儒斯特角现象和共光路外差干涉测量原理，我们提出了一种光学方法，可在一种光学配置中同时测量手性溶液的旋光角和折射率。将一束外差光束和一束圆偏振外差光束分别引导至投射到半圆形玻璃与手性溶液的界面上。其中一束光束透过溶液，另一束在界面处以接近布儒斯特角的角度反射。然后，两束光分别通过偏振组件进行干涉。通过某些偏振组件的适当方位角，用于确定旋转角和折射率的两个干涉信号的相位差变得非常大，从而实现精确的旋转角和折射率测量。我们的实验结果证明了该测量方法的可行性。该方法应具有高精度、样品介质长度短和操作更简便的优点。
