Diffractive optics phase profile

Fig. 2. Experimental setup for taking a snapshot of X-ray diffraction profile of optical phase-change materials.

Figure 5.12a depicts an example of the measured interferograms. Five interferograms were taken with a phase shift between each interferogram and a wrapped phase map could be generated. The unwrapped phase map representing the actual optical path difference profile generated by the diffractive lens appears in Figure 5.12b. A good spherical wave was obtained with very few higher order aberrations as indicated by an rms wavefront error of only 5.0889A,.

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