Fig. 9-1 Principle of monochromatic radiation with a quasi-periodic undulator and a crystal monochromator

A crystal monochromator selectively diffracts a fundamental wave and its harmonics. A quasi-periodic undulator can generate noninteger harmonic waves, so that a purely monochromatic radiation required for measurement can be obtained through a crystal monochromator.

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Persistent Quest - Research Activities 1996
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