Subaperture stitching for measurement of freeform wavefront

Applied Optics
Kamal K PantChandra Shakher

Abstract

A method based on subaperture stitching for measurement of a freeform wavefront is proposed and applied to wavefronts calculated from the slope data acquired using a scanning Shack Hartmann sensor (SHS). The entire wavefront is divided into a number of subapertures with overlapping zones. Each subaperture is measured using the SHS, which is scanned over the entire wavefront. The slope values and thus the phase values of separately measured subapertures cannot be connected directly due to various misalignment errors during the scanning process. The errors lying in the vertical plane, i.e., piston, tilt, and power, are minimized by fitting them in the overlapping zone. The radial and rotational misalignment errors are minimized during registration in the global frame by using active numerical alignment before the stitching process. A mathematical model for a stitching algorithm is developed. Simulation studies are presented based on the mathematical model. The proposed mathematical model is experimentally verified on freeform surfaces of a cubic phase profile.

References

Aug 15, 2003·Applied Optics·Stephan ReicheltHans J Tiziani
Nov 27, 2006·Optics Express·David D WalkerAnthony Beaucamp
Dec 17, 2009·Applied Optics·Zheng ZhenrongLiu Xu
Mar 1, 1971·Applied Optics·A J Macgovern, J C Wyant
Aug 5, 2014·Applied Optics·Likai LiAllen Y Yi

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Citations

Aug 10, 2017·Optics Express·Yu ZhangRongguang Liang
May 24, 2018·Applied Optics·M BichraS Sinzinger
Mar 4, 2020·Optics Express·Yong Bum SeoKi-Nam Joo
Feb 23, 2018·Applied Optics·Kamal K PantChandra Shakher
Oct 27, 2020·Applied Optics·Goeun KimHo-Soon Yang
Mar 11, 2021·Applied Optics·Nikolaus BerlakovichGeorg Schitter

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