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| A selection of commercially available Shack-Hartmann wavefront sensors (top). The instruments use the principles described below to measure the wavefront of a light beam and are useful for characterizing and optimizing the performance of a wide variety of optical systems. Fig. 1: a Shack-Hartmann sensor analysing the wavefront from a perfect beam (a) and a beam with aberrations (b) (bottom). The deviations of the focal points from the grid relate to the local gradient of the wavefront. |
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