Hi

I am trying to propagate a matrix of independent Gaussian beams incoherently, but for some reason it seems that the beams are still interfering with each other (i.e. it seems that the POP is propagating the beams coherently).

I have defined the beams as incoherent in a Multimode file:

Which looks like this:

In the far field the intensity looks like this:

It looks like there is interference (side lobes). Its possible to see it more clearly with a cross-section:

If the propagation was incoherent, then the intensity should not dip where I have indicated with the red arrows, right? In addition, I am getting a nonsensical beam parameter product which is too low and implies coherent propagation. 

Maybe this is a problem with sampling or window size? Or syntax in the Multimode file?

Can anyone help? :)