Dear Experts,
in order to assess a long distance propagation of a collimated laser beam in dependence of the quality of the optical system, I have used a POP propagation through my optical system (several spherical and aspherical lenses with a SMF source). I have turned my system to an afocal system.
Having the tolerances of my lenses, I perform a tolerance analysis with 20 Monte-Carlo runs. My only compensator is the distance between the SMF fiber and the first lens collimating this beam (with the NA of the fiber).
Here the output of the POP cross-section overlay graph:
What I find interesting is that there are two distinct sets (set A and 
of curves. These sets seem to have a different scaling, as they have different x-ranges (ranges A and .
I can’t imagine that there is an automatic rescaling. I have turned any “Re-Compute Pilot Beam Parameters” off, and also the “auto resample” (which probably would not do a resample during the different runs, would they?).
This is the only resample I do in the system.
Where could these two ranges come from? This is an essential question for me, as I want to assess the beam width and the peak power at the long distance.
Many thanks for a good advice!
Markus
