Hi,

I'm looking for a good explanation (mathematical and intutive) for the

action of a lens as an optical fourier transform. could somebody point me to

a good resource for this?

Thanks,

-fj

> Hi,

> I'm looking for a good explanation (mathematical and intutive) for the

> action of a lens as an optical fourier transform. could somebody point me to

> a good resource for this?

> Thanks,

> -fj

interference?

>I'm looking for a good explanation (mathematical and intutive) for the

>action of a lens as an optical fourier transform. could somebody point me to

>a good resource for this?

software to experiment.

<http://www.sinopt.com/>

Here's an online optics tutorial, with interactive 3D graphics.

<http://www.erc.msstate.edu/~foley/newtop/>

However, Fourier transforms are used more to analyze the effects of

Fraunhofer (far field) diffraction. For example, suppose you have a

telescope with a 200mm circular aperture; the Fourier transform of the

aperture, an Airy function, is like a circularly symmetric sinc, with

a central bright disk that limits the resolving power by convolving

with the ideal point images of stars. As you increase the aperture,

the Airy disk shrinks, increasing the amount of detail that can be

resolved (as well as gathering more light). A Newtonian telescope has

a small secondary mirror and supports, and these obstructions further

spread the point images; again the diffraction effects are captured by

a Fourier transform.

> If you're getting this seriously into optics, you might want some free

> software to experiment.

> <http://www.sinopt.com/>

> Here's an online optics tutorial, with interactive 3D graphics.

> <http://www.erc.msstate.edu/~foley/newtop/>

Do you mean Fresnel diffraction - isnt Fresnel diffraction the one with aQuote:> However, Fourier transforms are used more to analyze the effects of

> Fraunhofer (far field) diffraction.

sinc pattern ?

-fj

>Do you mean Fresnel diffraction - isnt Fresnel diffraction the one with a

>sinc pattern ?

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