Modeling a conical spatial filter in non-sequential
I am looking to model a conical spatial filter and I am trying to figure out the best way to do this. I started with a non-sequential model and an absorbing annular volume as the spatial filter. I am specifically trying to look at the spatial frequencies being clipped by the spatial filter, the output beam profile, and how the roughness of the surface of the spatial filter can impact the output beam. I am using the detector viewers to look at the output beam but is there a way to quantify these results. Any assistance would be greatly appreciated.
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Unless you absolutely need to use non-sequential mode, I would recommend using sequential mode and Physical Optics Propagation (POP) for modeling a spatial filter (this is actually one of the only 3 times when you absolutely need to use POP because geometric rays cannot model this case). You should use POP for the following 3 scenarios:
Modeling a spatial filter where you’re trying to remove higher order Hermite-Gaussian or Laguerre Gaussian modes
Modeling the Gibbs phenomenon of near field “ringing” at a hard aperture
“Free space diffraction” of propagating a beam from inside the Rayleigh range to outside the Rayleigh range
POP is useful for many other systems but these 3 areas have to use POP to get accurate results. There are 3 really good Knowledgebase Articles that discuss how to use POP:
That makes sense for the analysis portion. Is there an easy way to model to conical pinhole in sequential mode? I am looking to model something like this:
My initial thought was to use a lot of apertures spaced closely together but was wondering if there is an easier solution. Thanks for your reply!
