File:Diffraction on elliptic aperture with fft.png
Summary
The upper half of this image shows a diffraction pattern of He-Ne laser beam on an elliptic aperture about 3 m far. The lower half is a detail of its 2D Fourier transform calculated in GIMP. Thanks to similarity between the forward and inverse Fourier transform, it has approximately reconstructed the shape of the aperture. There are also two "wings" of higher spatial frequency caused by the millimeter grid on the paper. Note that the lower half of the image represents the imaginary values. The approximately reconstructed aperture shape is blended with its horizontally mirrored copy.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:41, 5 January 2017 | | 556 × 828 (315 KB) | 127.0.0.1 (talk) | The upper half of this image shows a diffraction pattern of He-Ne laser beam on an elliptic aperture about 3 m far. The lower half is a detail of its 2D Fourier transform calculated in GIMP. Thanks to similarity between the forward and inverse Fourier transform, it has approximately reconstructed the shape of the aperture. There are also two "wings" of higher spatial frequency caused by the millimeter grid on the paper. Note that the lower half of the image represents the imaginary values. The approximately reconstructed aperture shape is blended with its horizontally mirrored copy. |
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