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Dual-wavelength operation diffractive phase elements for pattern formation
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DOI：10.1364/OE.1.000054.png)
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Abstract
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We report on the design and fabrication of novel diffractive phase elements that reconstruct distinct intensity patterns in the far-field on illumination with two specific wavelengths. The elements contain deep surface-relief structures that represent phase-delays of greater than 2 pi radians. The design process incorporates a modified version of the iterative Fourier transform algorithm. A 16 phase-level element for dual wavelength (blue and red) operation, with high diffraction efficiency, is demonstrated experimentally. (C) 1997 Optical Society of America
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3.3
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