Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 16, Number 1, 2020
|
|
---|---|---|
Article Number | 3 | |
Number of page(s) | 11 | |
DOI | https://doi.org/10.1186/s41476-019-0122-3 | |
Published online | 16 January 2020 |
Research
Correction of wavefront rotation between interferometer and shack-hartmann sensor using bending modes
1
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Dong Nan Hu Road 3888, 130033, Changchun, China
2
University of Chinese Academy of Sciences, 100049, Beijing, China
Received:
21
August
2019
Accepted:
13
December
2019
In some active optics system, the influence function, which is the surface deformation ability of an actuator, is measured by directly detecting the mirror surface using an interferometer and the surface correction of the primary mirror is done using the Shack-Hartmann (S-H) sensor. However, if the wavefronts of the interferometer and the S-H sensor have an obvious rotation, a large error will be introduced to the correction force calculations. In this paper, bending modes are used to detect this wavefront rotation. Bending modes are a series of orthonormal stiffness-increasing modes calculated using the influence functions. Two methods, optimum search and top-line (a line passes through the surface center and the top of surface deformation peaks) detection, are developed and tested in simulation using the experimental data of a 620-mm active optics system. The detection errors of the two methods are 0.286° and 0.085° in the simulation, respectively. The rotation detection method is then tested on this 620-mm system. The simulation and experimental results show that top-line detection is a suitable method for the detection of wavefront rotation.
Key words: Wavefront rotation;active optics / Bending mode
© The Author(s) 2020
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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