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Schematic of the diffraction experiment: is the domain width, the period is , is the sample thickness, and the screen position is .
Far field diffraction pattern of a PPMgLN sample with a period of .
Normalized diffraction intensity of the different diffracted orders.
Scanning electron microscopy image of the PPMgLN structure after 5 min of etching.
Simulation curve of the diffraction intensity vs with and and , respectively.
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