It generated what appeared to be similar image quality compared to the 4f setup. simulation lens diffraction-pattern fresnel. 1 (b), here called the 2f setup, was first described by Schmidt et al. Performance Limits of a Photographic Objective as a Fourier Transform Lens. So now the second lens should in principle do another Fourier transform giving back you original field function, right? (this is based on the 4F system in the link without the transmission mask )īut if you draw a ray diagram, it would tell another story, for a collimated beam everything goes as expected they enter collimated and exit collimated.īut for a point source, when it passes the concave lens it diverges even more and all the information will never be refocused back to a point. A Matlab simulation for a 4F Correlator system which is based on the Fourier transforming properties of lenses. A Class 2 laser is safe because the blink reflex will limit the exposure to no more than. 2, six lens elements is the minimum number required for full aberration control. ![]() Take a concave lens, put an object on the left focal plane, next place a convex lens so that it's focus plane is at the virtual image plane of the concave lens. This Fourier transform is formed at 2f of lens 2, because the first Fourier transform plane (formed at 300 units on scale) now acts as an ‘object’ for lens 2. Actually, I've thought about this some more with the following thought experiment.
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