18 June 2007 Special lenslet array with long focal length range for Shack-Hartmann Wavefront Sensor
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Abstract
Since its emergence in the early 1970s, Shack-Hartmann Wavefront Sensing technology has been investigated and explored world-widely by the researchers and engineers. However, there are few papers or reports to study the system performance and key factors to affect the performance of a Shack-Hartmann Wavefront Sensor (SHWS), in this paper, through experimental study of the system stability of a SHWS, it is found that the image sensor and detector, normally a CCD, should be placed exactly at the focal plane of the lenslet array, otherwise it will bring in significant wavefront measurement error. In order to improve the system performance, a special lenslet array with long focal range is designed, and it is functioned by a spatial light modulator for sampling wavefront in a SHWS. Diffractive lenses with long focal length range can provide pseudo-nondiffracting beams, and a long range of focusing plane. The performances and effects of the modified SHWS with such a special lenslet array generated by a programmable SLM, are investigated, and the experimental results show that the system stability and measurement repeatability are not sensitive to the sensing distance, and can keep at a good level in a long range.
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L. P. Zhao, L. P. Zhao, N. Bai, N. Bai, X. Li, X. Li, Z. P. Fang, Z. P. Fang, A. A. Hein, A. A. Hein, Z. W. Zhong, Z. W. Zhong, } "Special lenslet array with long focal length range for Shack-Hartmann Wavefront Sensor", Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 66161O (18 June 2007); doi: 10.1117/12.726043; https://doi.org/10.1117/12.726043
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