Analysis on Shack–Hartmann wave-front sensor with Fourier optics |
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Authors: | Yang Dai Faquan Li Xuewu Cheng Zhiling Jiang Shunsheng Gong |
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Affiliation: | aNational Key Laboratory of Magnetic Resonance and Atomic Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, P.O. Box 71010, Wuhan, Hubei 430071, China |
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Abstract: | In Shack–Hartmann wavefront sensor (SHWS), the behavior of the irradiance pattern produced by the micro-lens array is important for an accurate centroid estimation. In this paper, the behavior of a micro-lens array in SHWS is analyzed using Fourier optics, and reveals that in addition to the main, expected spots, secondary spots with smaller intensities also appeared as a result of diffraction by the small dimensions of the micro-lens and interference from the different micro-lenses. This result is confirmed by comparing with a irradiance pattern taken from an actual SHWS. The additional error in centroid estimation caused by these secondary spots is discussed and relationship to the parameters of the micro-lens of SHWS is analyzed. |
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Keywords: | Shack– Hartmann wavefront sensor Micro-lens array Fourier optics |
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