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Figure 3
(a) Surface profile of the measured bent crystal using a stitching interferometer. The high-spatial-frequency data are filtered. (b) The main part of the fitted hyperbolic-paraboloid surface (saddle surface). The surface equation is z = (yyc)2 / 2Ry − (xxc)2 / 2Rx + c(xxc)(yyc) + f. (c) The regular cubic term of the fitted measured surface is z = a(xxc)3. This term can be explained by the unequal couples applied on each end of the crystal slab. (d) The fitting errors of the measured surface.

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