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- W2019477951 abstract "ABSTRACT In linear optics, the visualization of phase object and the contrast improvement of the image of amplitudeobject are obtained using a small absorbing and dephasing screen at the Fourier spectrum plane of the objet (Zer- nike method). In this communication it is shown that the screen can be replaced by a non linear medium displaying either non linear absorption or depletion of the exciting beam by non linear scatterings, and non linear change inthe refractive index at convenient levels. The conditions leading to the visualization of phase object or to contrast inversion in amplitude objects are studied for a tenth of liquids. The advantage of the proposed method is that it needs neither the construction of a screen nor precisealignments. 1. INTRODUCTION The .principle of this experimeit is the same as that used in linear optics to perform phase contrast in theZernike method: a small screen is placed in the Fourier spatial spectrum of an object to absorb and dephase its cen-tral components. The non linear media can act in the same way: the phase variation is induced by non linear refrac-" @default.
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- W2019477951 date "1989-03-28" @default.
- W2019477951 modified "2023-09-26" @default.
- W2019477951 title "Use Of Non Linearities For Optical Imaging: Visualization Of Phase Objets And Improvement In The Contrast Of Amplitude Objets" @default.
- W2019477951 doi "https://doi.org/10.1117/12.950388" @default.
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