《Table 1.Summary of the Surface Form Measurement Results》

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《Absolute surface form measurement of flat optics based on oblique incidence method》

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To verify the effectiveness and validity of the new method，two other methods，including the N-rotation measurement method and relative measurement method，are also implemented in the experiment.The surface measurement results are shown in Fig.7，where Figs.7（a），7（b），and 7（c）are the results by the three methods，respectively.It is seen that the distributions of the surface form measured with the three methods show a good similarity.Because the surface error from the flat K has been removed，both Figs.7（a）and 7（b）have very close PV values，which are a little smaller than that of Fig.7（c）as shown in Table 1.