Simultaneous measurement of retardation and fast axis angle of eighth-wave plate in real time |
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| Authors: | Ruifang Fang Aijun Zeng Linglin Zhu Longhai Liu Huijie Huang |
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| Institution: | a Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800, People's Republic of China
b Graduate University of the Chinese Academy of Sciences, Beijing 100049, People's Republic of China |
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| Abstract: | A simultaneous measurement method for the retardation and the fast axis angle of the eighth-wave plate in real time is proposed. The beam emitted from the laser passes through the circular polarizer and the eighth-wave plate to be measured successively, and then is split by the Dammann grating to form three sub-beams. They are analyzed by an analyzer array and detected by a detector array. Three detection signals are obtained simultaneously to calculate the retardation and the fast axis angle in real time. In experiments, a crystal quartz sample is measured at different fast axis angles. The average and standard deviation of its retardation respectively are 40.9°and 0.5°. The maximum measurement deviation of the fast axis angle is 2.1°. The usefulness of the method is verified. |
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| Keywords: | Retardation Fast axis angle Wave plate Real-time measurement |
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