The optimal model reconstruction of Hartmann-Shack wavefront sensor
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College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Corresponding author:
LIAO Wen-he, cnwho@nuaa.edu.cn
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Received Date:
2007-05-14
Accepted Date:
2007-10-16
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Abstract
Reconstruction modes of Hartmann-Shack wavefront sensor have direct influence on the precision of sensing and reconstruction of incident wavefront.Because reconstruction modes of Zernike polynomials based on Hartmann-Shack wavefront sensor were easy to be influenced by the gradient sensing noise,optimal reconstruction modes according to the wavefront sensing noise were put forward by the correlation analysis and decoupling transform of wavefront reconstruction matrix.Furthermore,the error of wavefront model reconstruction thanks to the wavefornt sensing noise can be reduced by filtering the portion of the optimal modes.By Monte-Carlos' random experiment,the antinoise level of Hartmann-Shack wavefront sensor whose subapertures distributes at a square was verified.As a result,the reconstruction error reduced from 0.0212λ to 0.0048λ after getting rid of the part of optimal reconstruction.The way to analyze the optimal reconstruction modes has an effect on filtering the wavefront gradient sensing and improve the sensing precision of wavefront sensor.
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