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Method for determining the wavefront aberration of deformed optical components under external forces

Le, T.D. and Tran, Q.A. and Do, S.V. and Le, H.H. and Ta, D.V. (2022) Method for determining the wavefront aberration of deformed optical components under external forces. Optical Engineering, 61 (11). ISSN 00913286

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Abstract

Wavefront aberration is an essential factor that significantly affects the image quality of an optical system. We proposed a comprehensive method to determine the wavefront aberration of a deformed optical component caused by clamping forces. First, the displacement of the elements on the optical component, induced by external forces, is calculated using ANSYS software. Then, the deformation surface is fitted with an aspherical surface to obtain Zernike coefficients. Finally, the wavefront aberration is obtained from Zemax using the Zernike coefficients and the parameters of the optical component. An experimental study on a spherical mirror is carried out to verify the accuracy of this method. A Zygo interferometer is used to measure the actual wavefront aberration of the deformed mirror. The result indicates a good agreement between the theoretical calculation and the experimental data, with a variation of <10 for various applied forces. Our finding provides a meaningful and reliable method for designing and selecting reasonable mounting structures to ensure the image quality of an optical system. © 2022 Society of Photo-Optical Instrumentation Engineers (SPIE).

Item Type: Article
Divisions: Faculties > Faculty of Mechanical Engineering
Faculties > Faculty of Special Equipments
Identification Number: 10.1117/1.OE.61.11.115104
Uncontrolled Keywords: Aberrations; Image quality; Least squares approximations; Mirrors; Optical systems; Wavefronts, ANSYS software; Clamping Force; Comprehensive method; External force; Optical components; Ordinary least squares; Wavefront aberrations; Zernike; Zernike coefficient; Zernike standard polynomial, Finite element method
URI: http://eprints.lqdtu.edu.vn/id/eprint/10721

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