Abstract
Line curvature error greatly influences the quality of the diffraction wave fronts of machine-ruling gratings. To reduce the line curvature error, we propose a correction method that uses interferometric control. This method uses diffraction wave fronts of symmetrical orders to compute the mean line curvature error of the ruled grating, taking the mean line curvature error as the system line curvature error. To minimize the line curvature error of the grating, a dual-frequency laser interferometer is used as a real-time position feedback for the grating ruling stage, along with using a piezoelectric actuator to adjust the stage positioning to compensate the line curvature error. Our experiments show that the proposed method effectively reduced the peak-to-valley value of the line curvature error, improving the quality of the grating diffraction wave front.
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Acknowledgments
The authors acknowledge supports from the Chinese Finance Ministry for the National R&D Projects for Key Scientific Instruments (Grant ZDYZ2008-1) and from Ministry of national science and technology for National Key Basic Research Program of China (Grant 2014CB049500).
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Yu, H., Li, X., Zhu, J. et al. Reducing the line curvature error of mechanically ruled gratings by interferometric control. Appl. Phys. B 117, 279–286 (2014). https://doi.org/10.1007/s00340-014-5832-z
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DOI: https://doi.org/10.1007/s00340-014-5832-z