Browsing by Author "Patorski, K."

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    Compact Grating Interferometer For Producing Photoresist Gratings with Incoherent-Light
    Post, Daniel; Patorski, K.; Ning, P. (Optical Society of America, 1987)
    An achromatic interferometer was developed to produce 1200-lines/mm crossed-line photoresist gratings with a mercury arc light source. It is a compact reflection system of outstanding stability. Alignment procedures are described. The most stringent requirement, coplanar alignment of two folding gratings, was accomplished with the aid of a Twyman-Green interferometer. The grating interferometer produced crossed-line photoresist gratings with first-order diffraction efficiency exceeding 20%.
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    Real-Time Optical Differentiation For Moire Interferometry
    Patorski, K.; Post, Daniel; Czarnek, R.; Guo, Y. F. (Optical Society of America, 1987)
    Real-time methods for differentiation of in-plane displacement fields produced by the moire interferometry technique are introduced. Two approaches are developed: (1) optical shearing of displacement patterns and (2) superposition of two lateral shear interferograms of wavefronts from 2 diffraction orders of the specimen grating. Coherence problems are circumvented by polarization effects. In both cases additive-type moire fringes give the map of displacement derivatives of the object under load. The issue of carrier patterns and extraneous fractional fringe order is clarified. Experimental verification of the principle is presented.