Knife-edge diffraction pattern as an interference phenomenon: An experimental reality |
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Authors: | Raj Kumar SK Kaura AK Sharma DP Chhachhia AK Aggarwal |
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Institution: | aCoherent Optics Division, Central Scientific Instruments Organisation, Sector 30, Chandigarh 160 030, India |
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Abstract: | This paper demonstrates that a knife-edge diffraction pattern is, indeed, due to the interference of two superimposing waves: the geometrical wave and the boundary diffraction wave. Within the framework of boundary diffraction wave theory it is shown that this diffraction pattern can easily be broadened in such a manner that a single fringe covers the whole field of view. At this point the system converges to a schlieren diffraction interferometer and could be used for the study of phase objects using diffraction-limited optics. Experimental observations show that the method bears a similarity to that of any known two-beam interferometer, e.g. Mach-Zehnder interferometer. The experimental details have been presented and the results are compared with a two-beam holographic interferometer and a point diffraction interferometer. |
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Keywords: | Diffraction Interference Schlieren techniques |
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