In article <NEBBKHCFDGIGIJEHDJFCCENADEAA.email@example.com>, Paul
D. DeRocco <firstname.lastname@example.org> writes
>Kewl. How do you do an optical Fourier transform?
Probably a lot easier that you thought, Paul - you do it all the time!
An ideal lens is a real time Fourier Transforming device. The image
formed by the lens is just an FT, scaled by wavelength, of the light
intensity across the lens stop.
That is why, in a perfect lens, the image formed by a monochromatic
point source is the well known Fresnel diffraction pattern - the FT of
the circularly symmetrical lens aperture.
Many textbooks have been written on this topic, but a couple worth
looking at if you want to know more are:
JW Goodman : Introduction to Fourier Optics published by McGraw Hill and
JD Gaskill : Linear Systems, Fourier Transforms and Optics, published by
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
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