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Wavefront Contour Map

CGHs can be thought of as a contour map of wavefront modification.  The more dense the lines on the CGH, the more quickly the wavefront changes:

Alternatively, if you plot the desired wavefront modification that the CGH provides, the lateral location of the grating lines can be obtained:  Everywhere the phase function crosses an integer number of waves, there should be a pair of lines in the pattern.

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