Hello everyone,

I am very new in Zemax. I am trying to model a simple imaging system for an AOD setup. As an input, I would like to have 2 beams with a defined aperture and angle to the optical axis originating form the center of the objective aperture.

At the moment I am using the entrance pupil diameter to set the beam width and because I want to model laser beams I use a Gaussian Apodization as well. (I know this is probably not the best way to model a gaussian beam in Zemax but because I have to use some black box optical elements I can not use physical image propagation.)

The optimization of the system works very nice so far and I get diffraction limited spots in the imaging plain.

My problem is that every time I change something, for example the length of the system, the angled beam gets displaced and its origin is not the optical axis any more.

I hope someone can help me with this very simple problem it is probably as easy as setting some option correctly but I do not find the right switch.

Thank You very much. Best regards

Martin