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Adjustable flexure mount to compensate for deformation of an optic surface

Authors :
Feng, Zhou
Jie, Yu
Li-Ping, Wang
Yuan-Ming, Li
Hai-Tao, Zhang
Quan, Man
Qiang, Li
Ran, Bi
Hui, Wang
Chun-Shui, Jin
Source :
Applied Optics; December 2019, Vol. 58 Issue: 34 p9370-9375, 6p
Publication Year :
2019

Abstract

An adjustable mounting structure is proposed to compensate for surface deformation of a mirror caused by the assembly process. The mount adopts a six-point support based on the kinematic mount principle. Three of the support points are adjustable, and they are moved along the axial direction by actuators. Surface deformation is expressed by Zernike coefficients in this paper, and a sensitivity matrix of the surface deformation is established by varying the unit displacement of each adjustment support point and getting the corresponding Zernike coefficient changes. The surface deformation is measured, and the compensation adjustment of each adjustable support point is then obtained by anti-sensitivity calculation. Finally, the feasibility of present support structure design and surface figure compensating method are verified by experiments. The experimental results show that the present structure and method could significantly reduce the surface deformation caused by the assembly process. The surface deformation is 4.6 nm RMS after assembly and it is decreased to 1.3 nm RMS after four iterations of compensation, which is close to the 1.1 nm RMS after optical polishing.

Details

Language :
English
ISSN :
1559128X and 21553165
Volume :
58
Issue :
34
Database :
Supplemental Index
Journal :
Applied Optics
Publication Type :
Periodical
Accession number :
ejs51585281