Lens displacement and Extended pseud wavelength

[oguram3]

I am impressed with your ‘Diffractsim’, as it is very fast and as beautiful as a kaleidoscope.
Let me make some questions.
First, I tried to reproduce imaging with a lens seen in Fig.4 of your article.
(https://rafael-fuente.github.io/simulating-light-diffraction-with-lenses-visualizing-fourier-optics.html), with example/ lens_longitudinal_profile.py)
But I could not place the lens at the right position. Is it possible to place a lens and aperture along the z Direction and trace the profile?
(Similar light propagation module named ‘lightpipe’ (https://opticspy.github.io/lightpipes/) is slow and its output is not fancy as yours, but it allows cascade connection of optical parts along the light path.)

Second, I wonder if you could map invisible wavelengths to visible for display.
I am considering multi-wavelength hologram near infrared region. It will be nice to present 700nm as blue and 850nm as red , or 300nm as blue and 450nm as red in some occasions as we can measure invisible light wavelength but display should be visible.

Third, I wonder if there is an efficient way to simulate in-line hologram from arbitrary macroscopic block shapes. Or to get an electric filed from arbitrary concave or convex surface expressed as a mesh plot at a certain distance.
There is a paper which suggests that multi-wavelength hologram is usable to measure a macroscopic object with the extended artificial wavelength.
(Multi-wavelength digital holography for 3D -shape-measurements on rough surfaces
https://www.ama-science.org/proceedings/getFile/ZmDk)

In such a purpose, I would like to simulate several or several tens discreet wavelengths and see what is like the super imposed electric fields.

I hope that you would consider to add a few touches toward such applications.

Thanks anyway for your fancy masterpiece.

Mutsuo Ogura (Japan
questions_for _diffractsim.pdf
)