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A Measurement Technique of the Tiny Rotatory Angle of Polarization

Chang Yue;Qian Xiaoling (Physics Department, the Capital Normal University Beijing 100037)  
This experiment demonstrates a measurement technique of very small rotatory angle of polarization. Faraday rotatory angle is measured in ethanol solution of concentration 50% usiflg 632.8 nm He-Ne laser and 532 nm LD pump solid laser as measuring sourcest respectively. The rotatory ang1e can take values in the mag-nitude of sub-millidegree (10-4degrees ) as the intensity of induction field changes.Applying this polarimetric technique, the rotatory angle can be measured in the cane sugar solution of concentration of 10-4g/ml. Therefore it provides a good polarimetric method for chemical and life substances with small Verdet constants.
【Fund】: 北京市自然科学基金
【CateGory Index】: O436
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