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Figure 1
Two opposite-facing saw-tooth structures, tilted symmetrically about the beam axis, impose a parabolic thickness profile. Either piece's spatial acceptance is at most the tooth height v, occurring when the saw-tooth pattern is long enough (>v/sinα) for the grazing incidence setting. The beam can enter from either end, leaving the operation unaffected.

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ISSN: 1600-5775
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