Contrast reversal and enhancement of phase spot array/grid with an intensity-dependent refractive index medium as phase filter

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• 作者：Kaladevi Sendhil ; C. Vijayan and M.P. Kothiyal
• 关键词：Image enhancement ; Holographic array illuminator ; Phase filtering ; Porphyrin
• 刊名：Optics and Lasers in Engineering
• 出版年：2006
• 出版时间：February 2006
• 年：2006
• 卷：44
• 期：2
• 页码：122-129
• 全文大小：322 K

文摘

We report on a complete contrast reversal and contrast enhancement of a holographically recorded phase spot array/grid achieved by phase filtering, using an intensity-dependent refractive index medium, zinc tetraphenyl porphyrin as phase filter placed in the Fourier plane of the 4-f imaging system. We show that the contrast enhancement is robust and insensitive to local errors in the phase array and can be used to repair a damaged portion of the input phase array.