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Proceedings Paper

Compact snapshot freefrom null testing with adaptive optics (Conference Presentation)

Paper Abstract

We present a snapshot, adaptive null interferometric system for measuring freeform surfaces using deformable mirror as the null corrector to increase the measurement range. To compensate the wavefront for different surfaces, a computer controlled deformable mirror is used as an adaptive wavefront corrector. A deformable mirror control algorithm based on stochastic parallel gradient descent algorithm has been developed to drive the deformable mirror to null the interference fringe. Snapshot phase measurement is proposed in the optimization progress to increase the iterative speed. The surface shape of the deformable mirror is measured by a deflectometry system to calculate the shape of the surface under test.

Paper Details

Date Published: 13 May 2019
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Proc. SPIE 10991, Dimensional Optical Metrology and Inspection for Practical Applications VIII, 109910Q (13 May 2019); doi: 10.1117/12.2518789
Show Author Affiliations
Xiaobo Tian, The Univ. of Arizona (United States)
Heejoo Choi, The Univ. of Arizona (United States)
Alexander Sohn, Oculus VR, LLC (United States)
Yu Zhang, Northeast Electric Power Univ. (China)
Oliver Joshua Spires, The Univ. of Arizona (United States)
Dae Wook Kim, The Univ. of Arizona (United States)
Rongguang Liang, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 10991:
Dimensional Optical Metrology and Inspection for Practical Applications VIII
Kevin G. Harding; Song Zhang, Editor(s)

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