Inverse symmetric Dammann gratings

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• 作者：Qunyu Bi ; Changhe Zhou ; Jiangjun Zheng ; Wei Jia ; Xinglong Xie ; Zunqi Lin ; P.S. Chung
• 关键词：Diffraction gratings ; Beam splitter ; Fourier transform
• 刊名：Optics Communications
• 出版年：2009
• 出版时间：1 March 2009
• 年：2009
• 卷：282
• 期：5
• 页码：742-747
• 全文大小：811 K

文摘

Inverse symmetric Dammann grating is a special grating, whose transition points are reflection symmetric about the midpoint with inverse phase offset in one period. It can produce even-numbered or odd-numbered array illumination when the phase modulations are π or a specific value. Numerical solutions optimized by the steepest-descent algorithm for binary phase and multilevel phases with splitting ratio from 1 × 4 to 1 × 14 are given. Fabrication of 1 × 6 array without the zero-order intensity and 1 × 7 array with the zero-order intensity are made from the same amplitude mask. A 6 × 6 output without the crossed zero-orders was achieved by crossing two one-dimensional 1 × 6 inverse symmetric Dammann gratings. This grating may have potential value for practical applications.