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script transition from cartesian to cylindric issues

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elis02
elis02 2023-5-20
编辑： elis02 2023-5-20
Hi
I wrote a code for beam propagation in a medium but for some reason the cartesian vs the cylindric is different.
I think it's somewhere in the fourier transformations but I'm not sure.
Notice in the polar that I only use 'r' since my beam is assumed to be symmetrical so to count the 'theta' I just multiply by 2pi
this is the line of how i look at the beam in the radial:
plot(abs(E_r_t(:,length(T)/2)).^2)
and it looks bad already after first propagation in air. so i assume i'm making something bad. can look at line 135 in the radial for example and insert the code above.
for examle instead of 'fft2' i'm doing fft(E_r_f,[],1) for the radial since it's a different dimention.
Attaching the two codes.

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