Study on the Anomaly of the Fraunhofer Diffraction Pattern by an Ebert Optical Arrangement

概要

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The anomaly of the Fraunhofer diffraction pattern which is usually characteristic of a rectangular aperture has been observed in the visible region at various wavelengths by means of an Ebert spectrometer optical arrangement with a mirror in the place of the grating. The anomaly is observable when two plane monochromatic waves with phase difference produced by the step-mirror are combined and focused on the exit slit by the Ebert mirror. It was found that the phase difference of two waves changed periodicaly the forms and spacings of the diffraction pattern parallel to the dividing line on the mirror. The intensity difference of two waves with a constant phase difference could change mainly the forms of the foot, but not the spacing, of the diffraction pattern. When the dividing line on the mirror was not located in the center of the rectangular aperture, the forms of diffraction pattern markedly differed from those produced by the mirror, of which the dividing line was located in the center of the aperture. In the case of the mirror with π, namely λ/2 phase difference, the forms and spacings were always symmetrical regardless of the location of the dividing line in the aperture, except the change in the intensity minimum in the center of patterns. The forms of these bands were calculated theoretically, and they were also observed experimentally.
東北大学の論文
1961-00-00