A novel optical subdivision method for dual-frequency interferometer |
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Authors: | Zhiping Zhang Zhaogu Cheng Zhaoyu Qin Jianqiang Zhu |
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Institution: | Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, PR China |
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Abstract: | The theory of optical subdivision techniques of dual-frequency laser interferometers is stated. And a novel optical subdivision technique is proposed originally to enhance resolution of a commercial interferometer by adding some corner-cubes. Then the performance of the interferometer is tested. The interferometer resolution of 1.24 nm and the average error of below 2 nm are achieved by using the technique. The most novel of the optical subdivision technique is without λ/4 plates. It is less sensitive to environmental changes, it has prodigious potential to improve resolution farther and it can reduce polarization mixing error. |
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Keywords: | Interferometer Optical subdivision technique Fringe Scale factor |
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